A vehicle contains 500 pounds each of Explosives 1.1 and 1.2. Use:a) "Explosive 1.1" placardsb) "Dangerous" placardsc) "Explosive" and "Dangerous" placardsAnswer: a)...
If there is an "RO" before of after the item description on the shipping paper, it means the:
If there is an "RO" before of after the item description on the shipping paper, it means the:a) Material is in a package which contains no other materialsb)...
Which of the following items must drivers have in their possession while transporting Explosives 1.1 or 1.2?
Which of the following items must drivers have in their possession while transporting Explosives 1.1 or 1.2?a) The written route planb) The carrier's...
With most hazardous materials, you may briefly park within 5 feet of the road if your work requires it. The materials that are the exception and do not allow parking this close to the road are
With most hazardous materials, you may briefly park within 5 feet of the road if your work requires it. The materials that are the exception and do not...
The hazard class of a two liter bottle of material is "Flammable Liquid". If the description also says "poison inhalation hazard", placard the vehicle with:
The hazard class of a two liter bottle of material is "Flammable Liquid". If the description also says "poison inhalation hazard", placard the vehicle...
With most hazard materials, you may briefly park within 5 feet of the road, if your work requires it. The materials which are the exception and do not allow parking near roads is:
With most hazard materials, you may briefly park within 5 feet of the road, if your work requires it. The materials which are the exception and do not...
When you discover a hazardous materials cargo leak, you should:
When you discover a hazardous materials cargo leak, you should:a) Use your sense of smell to identify the materialb) Identify the hazardous materialc)...
When transporting packages of explosive, you must:
When transporting packages of explosive, you must:a) Keep bystanders 100 feet awayb) Roll the packages carefully, with no sharp or jarring actionsc) Never...
You vehicle is carrying chlorine. You only need to stop for railroad crossings when the shipment includes ___ of chlorine.
You vehicle is carrying chlorine. You only need to stop for railroad crossings when the shipment includes ___ of chlorine.a) 110 gallonsb) 100 gallonsc)...
If you must leave a placarded vehicle on a public roadway, be sure:
If you must leave a placarded vehicle on a public roadway, be sure:a) Both the cab and cargo areas are locked and the brakes are setb) To use proper fuses...
You have loaded a hazardous material into a cargo tank. What must you do before you move the vehicle?
You have loaded a hazardous material into a cargo tank. What must you do before you move the vehicle?a) Call CHEMTREC and tell them where you are goingb)...
You are transporting hazardous materials. You see a railroad crossing ahead of you. You may stop as far as ___ feet from the nearest rail.
You are transporting hazardous materials. You see a railroad crossing ahead of you. You may stop as far as ___ feet from the nearest rail.a) 25b) 50c)...
Your vehicle contains explosives, oxidizers, or flammables. No one may smoke within ___ feet of the vehicle.
Your vehicle contains explosives, oxidizers, or flammables. No one may smoke within ___ feet of the vehicle.a) 15b) 25c) 50Answer: b)...
The symbol "A" appearing in Column 1 of the Hazardous Materials Table means that the hazardous material is:
The symbol "A" appearing in Column 1 of the Hazardous Materials Table means that the hazardous material is:a) Subject to Hazmat rules only when transported...
Explosives 1.1 must not be transported in vehicle combinations that include:
Explosives 1.1 must not be transported in vehicle combinations that include:a) Materials classified as ORM-Db) Ago tank without bafflesc) Class 7 (radioactive)...
When fueling a placarded vehicle, someone must always be:
When fueling a placarded vehicle, someone must always be:a) At the nozzle, controlling the fuel flowb) Within 10 feet of the pump with a fire extinguisherc)...
When shippers package hazardous materials, they must certify the packaging was done according to the regulations. The only exception is if the:
When shippers package hazardous materials, they must certify the packaging was done according to the regulations. The only exception is if the:a) Shipment...
The quantity of the hazardous materials begins transported must appear on the shipping paper:
The quantity of the hazardous materials begins transported must appear on the shipping paper:a) If the amount is a reportable quantityb) At all timesc)...
Which of the following signals may be used to warn of a stopped vehicle containing explosive?
Which of the following signals may be used to warn of a stopped vehicle containing explosive?a) Signal firesb) Reflective trianglesc) FlaresAnswer: b)...
The National Response Center:
The National Response Center:a) Inspects any truck or bus involved in a hazardous materials accidentb) Helps coordinate the emergency response to chemical...
You are transporting hazardous materials. When you are not behind the steering wheel, the shipping papers must be on the driver's seat or:
You are transporting hazardous materials. When you are not behind the steering wheel, the shipping papers must be on the driver's seat or:a) In the driver's...
If the words "Inhalation Hazard" are on the shipping paper or package, you must:
If the words "Inhalation Hazard" are on the shipping paper or package, you must:a) Substitute "Dangerous" placards for amounts more than 1,001 poundsb)...
If you are loading or unloading any type of explosives, you must make sure the:
If you are loading or unloading any type of explosives, you must make sure the:a) Heater fuel tanks are completely fullb) Engine is idlingc) Cargo heaters...
If the symbol "D" appears in Column 1 of the Hazardous Materials Table, then the proper shipping name of the hazardous materials is:
If the symbol "D" appears in Column 1 of the Hazardous Materials Table, then the proper shipping name of the hazardous materials is:a) Subject to HMR...
When can you transfer a flammable liquid from one tanker to another on a public roadway?
When can you transfer a flammable liquid from one tanker to another on a public roadway?a) When it is an emergency situationb) If it is an off-peak traffic...
Shipping names shown in italics in the Hazardous Material Tables:
Shipping names shown in italics in the Hazardous Material Tables:a) Require extreme caution when handlingb) Are "Forbidden" materialsc) Are not proper...
If you have a hazardous materials fire, while driving, you should:
If you have a hazardous materials fire, while driving, you should:a) Not attempt to control the fireb) Remove all burning materialsc) Open the cargo doorsAnswer: a)...
Generally, the ___ must certify on the shipping paper that the shipment has been prepared in the correct manner.
Generally, the ___ must certify on the shipping paper that the shipment has been prepared in the correct manner.a) Shipperb) Carrierc) DriverAnswer: a)...
When carrying explosives and you have a breakdown or a crash, you should:
When carrying explosives and you have a breakdown or a crash, you should:a) Leave the vehicle and go for helpb) Not allow smoking or fire near the vehiclec)...
If the word "Forbidden" appears in the hazard class column of a Hazardous Materials Table entry:
If the word "Forbidden" appears in the hazard class column of a Hazardous Materials Table entry:a) The carrier may not open the package or containerb)...
Cylinders containing compressed gases may only be loaded onto a vehicle if the cylinders are:
Cylinders containing compressed gases may only be loaded onto a vehicle if the cylinders are:a) Loaded upright or braced lying down flatb) Bundled loosely...
Who is responsible for finding out what permits or special routes you will need to transport hazardous materials?
Who is responsible for finding out what permits or special routes you will need to transport hazardous materials?a) The driverb) The carrierc) The shipperAnswer: a)...
Smoking is prohibited when loading or unloading which of the following?
Smoking is prohibited when loading or unloading which of the following?a) Class 8 (corrosives)b) Division 6.1 (poisons)c) Class 5 (oxidizers)Answer: c)...
When transporting hazardous materials, you must stop your vehicle and check any set of dual tires at least one every ___, which is less.
When transporting hazardous materials, you must stop your vehicle and check any set of dual tires at least one every ___, which is less.a) 2 hours or...
The transport index of a radioactive material:
The transport index of a radioactive material:a) Another way of stating the package's weightb) Tells the degree of control needed during transportationc)...
You may not park a vehicle carrying hazardous materials within ___ feet of an open fire.
You may not park a vehicle carrying hazardous materials within ___ feet of an open fire.a) 300b) 400c) 500Answer: a) ...
Which of these partial lists contains the information you need to determine the correct placards to use?
Which of these partial lists contains the information you need to determine the correct placards to use?a) The truck's GVWR, the material's hazard class,...
When loading or unloading any explosive, you should:
When loading or unloading any explosive, you should:a) Use cargo hooks that are non-ferrousb) Place damaged packages on top of the stackc) Never use any...
An "X" in theHM column of a shipping paper means:
An "X" in theHM column of a shipping paper means:a) The material is not a hazardous materialb) This is an exception to the hazardous materials regulationsc)...
What should be fully engaged with no loose or missing pins in the slide mechanism of the sliding fifth wheel?
What should be fully engaged with no loose or missing pins in the slide mechanism of the sliding fifth wheel?a) Gapb) Locking pinsc) Sliding pintled)...
What should be clean with no dirt, illegal stickers, obstructions or damages to the glass?
What should be clean with no dirt, illegal stickers, obstructions or damages to the glass?a) Windshield and mirrorsb) Lighting indicatorsc) Headlightsd)...
You are making sure that hoses and lines are not cut, chafed, spliced, or worn, and not tangled, pinched, or dragged against tractor parts. What are you inspecting?
You are making sure that hoses and lines are not cut, chafed, spliced, or worn, and not tangled, pinched, or dragged against tractor parts. What are you...
What is the container (hoses) for the mechanism that transforms steering column action into wheel action?
What is the container (hoses) for the mechanism that transforms steering column action into wheel action?a) Steering box / hosesb) Suspensionc) Steering...
What are the brackets, bolts, or bushings that are used to attach the spring and / or air bag to the axle and vehicle frame?
What are the brackets, bolts, or bushings that are used to attach the spring and / or air bag to the axle and vehicle frame?a) Spring mountsb) Mounting...
If the container is not part of the pressurized system, to check the coolant level,
If the container is not part of the pressurized system, to check the coolant level,a) Remove the container cap and check the level visibleb) Inspect the...
What structure supporting the fifth wheel skid plate should be checked for cracks or breaks?
What structure supporting the fifth wheel skid plate should be checked for cracks or breaks?a) Kingpinb) Apronc) Platformd) Sliding pintleAnswer: c)...
Which gauge indicates the alternator or generator is charging?
Which gauge indicates the alternator or generator is charging?a) Temperatureb) Oil pressurec) Ammeter / voltmeterd) All of the aboveAnswer: c) Ammeter...
You are looking for puddles on the ground and dripping fluids on the underside of the engine and transmission. What are you checking for?
You are looking for puddles on the ground and dripping fluids on the underside of the engine and transmission. What are you checking for?a) Power steering...
What releases the fifth wheel locking jaws so the trailer can be coupled? (You should make sure that it is in the engage position and the safety latch is in place.)
What releases the fifth wheel locking jaws so the trailer can be coupled? (You should make sure that it is in the engage position and the safety latch...
Gas or hydraulic devices that cushion the vehicle ride and stabilize the vehicle and should be secure without leaks are called
Gas or hydraulic devices that cushion the vehicle ride and stabilize the vehicle and should be secure without leaks are calleda) Springsb) Brakesc) Mountsd)...
Which tires should have a minimum tread depth of 4/32 of an inch?
Which tires should have a minimum tread depth of 4/32 of an inch?a) Spare tiresb) Non-drive axle tiresc) Steering axle tiresd) All of the aboveAnswer: c)...
What maintains air pressure in the air brake system?
What maintains air pressure in the air brake system?a) Power steering / beltb) Water pump / beltc) Alternator / beltd) Air compressor / beltAnswer: d)...
Which gauge indicates increasing or normal lubrication pressure to prevent engine failure, seizure or breakdown?
Which gauge indicates increasing or normal lubrication pressure to prevent engine failure, seizure or breakdown?a) Oil pressureb) Temperaturc) Ammeterd)...
What should you check to be sure it is solid, clear of objects, and securely bolted to the tractor frame?
What should you check to be sure it is solid, clear of objects, and securely bolted to the tractor frame?a) Platformb) Catwalkc) Kingpind) ApronAnswer: b)...
You pump the pedal three times and hold it down for five seconds, making sure that the pedal does not move. What are you inspecting?
You pump the pedal three times and hold it down for five seconds, making sure that the pedal does not move. What are you inspecting?a) Air brakesb) Parking...
If worn, what can cause excessive heat buildup from a reduced ability to absorb and dissipate heat, possibly leading to loss of brake response?
If worn, what can cause excessive heat buildup from a reduced ability to absorb and dissipate heat, possibly leading to loss of brake response?a) Brake...
What is the sliding mechanism and locking device for tandem axles on trailers?
What is the sliding mechanism and locking device for tandem axles on trailers?a) Tandem release (arm/ locking pin)b) Framec) Suspension systemd) Landing...
The angle between the push rod and adjuster arm should be a little over 90 degrees when the brakes are released and not less than 90 degrees when the brakes are applied. This refers to the
The angle between the push rod and adjuster arm should be a little over 90 degrees when the brakes are released and not less than 90 degrees when the...
When checking the dipstick to see that the lubrication level is within the safe operating range, you are checking what?
When checking the dipstick to see that the lubrication level is within the safe operating range, you are checking what?a) Oil levelb) Coolant levelc)...
What, if loose or missing, may cause movement between the frame and fifth wheel assembly?
What, if loose or missing, may cause movement between the frame and fifth wheel assembly?a) Drawbarb) Mounting boltsc) Safety latchd) Locking pinAnswer: d)...
What should not be bent, damaged, or rusted through and should be evenly centered with the dual wheels and tires evenly separated?
What should not be bent, damaged, or rusted through and should be evenly centered with the dual wheels and tires evenly separated?a) Rimsb) Lug nutsc)...
Which of the following disengages the engine from the drive train so the vehicle won't move and reduces the load on the starter motor?
Which of the following disengages the engine from the drive train so the vehicle won't move and reduces the load on the starter motor?a) Parking brakeb)...
To improve visibility during severe or stormy weather, what must be secure, undamaged, and operating smoothly and correctly?
To improve visibility during severe or stormy weather, what must be secure, undamaged, and operating smoothly and correctly?a) Emergency equipmentb) Lighting...
What should you make sure is secure and not leaking and its cap(s) are tight?
What should you make sure is secure and not leaking and its cap(s) are tight?a) Fuel tank (s)b) Air compressorc) Water pumpd) All of the aboveAnswer: a)...
Which belt should you make sure is securely mounted and adjusts and latches properly?
Which belt should you make sure is securely mounted and adjusts and latches properly?a) Steeringb) Air compressorc) Safety/ seatd) Water pumpAnswer: c)...
What transmits power from the transmission to the drive axle?
What transmits power from the transmission to the drive axle?a) Air compressor beltb) Driveshaftc) Steering playd) Power steering beltAnswer: b)...
If the wheel has a sight glass, check that the oil level is adequate. Otherwise, look for leaks around the
If the wheel has a sight glass, check that the oil level is adequate. Otherwise, look for leaks around thea) Rimsb) Hydraulic brakesc) Hub oil/ axle sealsd)...
What do you inspect to make sure that all are present and free of cracks and distortions and show no signs of looseness such as rust trails or shiny threads?
What do you inspect to make sure that all are present and free of cracks and distortions and show no signs of looseness such as rust trails or shiny threads?a)...
Riding in the center portion of the lane:
Riding in the center portion of the lane:Answer: Keeps others from sharing your l...
Vehicle/motorcycle crashes are most common:
Vehicle/motorcycle crashes are most common:Answer: At intersecti...
When riding with a passenger, you should:
When riding with a passenger, you should:Answer: Start slowing son...
To reduce speed before turning:
To reduce speed before turning:Answer: Close the throttle and apply both bra...
When swerving, it is important to:
When swerving, it is important to:Answer: Separate braking from swerv...
When carrying loads:
When carrying loads:Answer: Keep the load to the rear of the motorcy...
In the picture below, the car driver is preparing to enter the intersection. To be seen and maintain a space cushion you should:
In the picture below, the car driver is preparing to enter the intersection. To be seen and maintain a space cushion you should:Answer: Slow down...
You plan to make a right turn after stopping at an intersection. Usually, it is best to turn from which portion of the lane?
You plan to make a right turn after stopping at an intersection. Usually, it is best to turn from which portion of the lane?Answer: The center p...
While in a turn, it is best to:
While in a turn, it is best to:Answer: Maintain a steady speed or gradually acceler...
To operate the throttle
To operate the throttleAnswer: Start with your wrist f...
Following closely to a vehicle in front of you:
Following closely to a vehicle in front of you:Answer: Is a factor in crashes caused by motorcycli...
Not turning off a turn signal:
Not turning off a turn signal:Answer: Encourages other drivers to pull into your p...
Which one of the following statements is correct?
Which one of the following statements is correct?Answer: Press left, lean left, go l...
Make a special point to use your mirrors when:
Make a special point to use your mirrors when:Answer: Slowing or stopp...
Your motorcycle has two brakes. Use both brakes:
Your motorcycle has two brakes. Use both brakes:Answer: Every time you slow or s...
To create more space in the situation pictured below, you should:
To create more space in the situation pictured below, you should:Answer: Adjust your speed and stay in the center of the l...
To make good judgment in traffic, you need to first:
To make good judgment in traffic, you need to first:Answer: Search ah...
In the picture below, riders A, B, and C are riding as a group. To pass, rider B should:
In the picture below, riders A, B, and C are riding as a group. To pass, rider B should:Answer: Return to the right portion of the lane behind rider...
Before changing lanes to the left:
Before changing lanes to the left:Answer: Check your left mirror and look to the l...
In slow, tight turns:
In slow, tight turns:Answer: Lean the motorcycle only and keep your body strai...
Wearing a helmet will:
Wearing a helmet will:Answer: Reduce your chances of neck and head injur...
Most crash-involved riders:
Most crash-involved riders:Answer: Overbreak the rear t...
When the front tire goes flat while riding:
When the front tire goes flat while riding:Answer: Apply the rear brake and steer to the edge of the r...
Alcohol enters the bloodstream and quickly reaches the brain. Which of the following is affected first?
Alcohol enters the bloodstream and quickly reaches the brain. Which of the following is affected first?Answer: Judgm...
If you have a flat tire while riding, hold the handle grips firmly and:
If you have a flat tire while riding, hold the handle grips firmly and:Answer: Use the brake of the good tire or avoid brak...
To predict how a hazard may affect you, it's important to:
To predict how a hazard may affect you, it's important to:Answer: Know the speed, distance, and direction that the hazard is mov...
With a properly adjusted mirror, you can see:
With a properly adjusted mirror, you can see:Answer: Part of the lane beside you and behind ...
The single most important thing you can do to improve your chances of surviving a crash is to:
The single most important thing you can do to improve your chances of surviving a crash is to:Answer: Wear a securely fastened hel...
You are being pursued by a police vehicle with its lights and siren activated. You have deliberately ignored the officer's warning to stop and have sped away. During the pursuit a person is killed. You are subject to:
You are being pursued by a police vehicle with its lights and siren activated. You have deliberately ignored the officer's warning to stop and have sped...
If your throttle sticks:
If your throttle sticks:Answer: Downshift and apply both bra...
To ride over metal bridge gratings as pictured below:
To ride over metal bridge gratings as pictured below:Answer: Ride straight acr...
When carrying loads:
When carrying loads:Answer: Keep the load low and as far forward as possi...
A group of riders move from a staggered formation into a single file when:
A group of riders move from a staggered formation into a single file when:Answer: Turing corn...
On a paved two-lane road, sand and gravel are most likely to collect:
On a paved two-lane road, sand and gravel are most likely to collect:Answer: Near the sides of the r...
When following a vehicle, you should try to:
When following a vehicle, you should try to:Answer: Ride where the driver can see you in the rear view mir...
You are preparing to move to the left lane, as pictured below. To spot vehicle passing beside you, it is best to:
You are preparing to move to the left lane, as pictured below. To spot vehicle passing beside you, it is best to:Answer: Turn your head to the l...
Of the following, which one gives the most eye and face protection while riding?
Of the following, which one gives the most eye and face protection while riding?Answer: A face shi...
In the picture below, the car is waiting to enter the intersection. Usually, it is best for you to:
In the picture below, the car is waiting to enter the intersection. Usually, it is best for you to:Answer: Slow and increase sp...
To cross tracks that run parallel to your course:
To cross tracks that run parallel to your course:Answer: Edge gradually acr...
When you are being followed too closely, it is usually best to:
When you are being followed too closely, it is usually best to:Answer: Drop back farther from the vehicle ah...
When carrying a passenger:
When carrying a passenger:Answer: it takes longer to brake and acceler...
The ability to think clearly and ride safely is affected by as little as:
The ability to think clearly and ride safely is affected by as little as:Answer: 1 dr...
If you must stop quickly while turning and you are unable to straighten the motorcycle first, apply the:
If you must stop quickly while turning and you are unable to straighten the motorcycle first, apply the:Answer: Brakes harder as the lean is red...
On a wet road, it will usually be most slippery:
On a wet road, it will usually be most slippery:Answer: In the center portion of the l...
To ride over an object on the road:
To ride over an object on the road:Answer: Rise slightly off the s...
When swerving, it is important to:
When swerving, it is important to:Answer: Separate braking from swerv...
In a normal turn, lean your:
In a normal turn, lean your:Answer: motorcycle and your body at the same an...
To see better when following a vehicle at night:
To see better when following a vehicle at night:Answer: Use the headlights of the vehicle ah...
In the picture below, it is usually best to ride in which position?
In the picture below, it is usually best to ride in which position?Answer: Position 2 or...
Compared with a straight truck or bus, there are ___ things to inspect in combination vehicles
Compared with a straight truck or bus, there are ___ things to inspect in combination vehiclesa) The same number ofb) Fewerc) MoreAnswer: c) M...
The service line
The service linea) Carries air to the cab of the rig to cool itb) Carries air to the parking brake to control the trailer brakesc) Carries air to a relay...
You should not back a tractor under a trailer until the whole air system is
You should not back a tractor under a trailer until the whole air system isa) At normal pressureb) Between 60 and 80 psic) Bled down to half the maximum...
You are coupling a tractor to a semi-trailer. You have connected the air lines. Before backing under the trailer, you should
You are coupling a tractor to a semi-trailer. You have connected the air lines. Before backing under the trailer, you shoulda) Pull ahead to test the...
For coupling to be completed, the safety catch for the fifth wheel locking lever must be
For coupling to be completed, the safety catch for the fifth wheel locking lever must bea) Through the locking leverb) Over the locking leverc) Straight...
The trailer hand valve works the trailer brakes. Which of these statements is true?
The trailer hand valve works the trailer brakes. Which of these statements is true?a) The trailer hand valve should be used only to test the trailer brakesb)...
You should not use the trailer hand valve while driving because
You should not use the trailer hand valve while driving becausea) It won't work as well as the foot brakeb) You should use the parking brakec) Of the...
What is the emergency air line?
What is the emergency air line?a) Air lines connecting the parking brake to the trailer brakesb) Air lines that control the emergency brakes on combination...
After the trailer has been coupled to the tractor, the tractor protection control valve should be placed in what position?
After the trailer has been coupled to the tractor, the tractor protection control valve should be placed in what position?a) Downb) Normalc) UpAnswer: b)...
You supply air to the trailer tanks by
You supply air to the trailer tanks bya) Pulling out the trailer air supply valveb) Pushing in the trailer air supply valvec) Connecting the service line...
Glad hands are used to connect the
Glad hands are used to connect thea) Electrical lines from the tractor to the trailerb) Service and emergency air lines from the truck or tractor to the...
Under good driving conditions, you should leave at least one second of space between your vehicle and the vehicle ahead for every ___ feet of your vehicle's length
Under good driving conditions, you should leave at least one second of space between your vehicle and the vehicle ahead for every ___ feet of your vehicle's...
After you supply air to the trailer, make sure the air lines are not crossed and the trailer brakes are working. This is done by
After you supply air to the trailer, make sure the air lines are not crossed and the trailer brakes are working. This is done bya) Applying and releasing...
You are driving a combination vehicle when the trailer breaks away, pulling apart both air lines. You would expect the trailer brakes to come on and
You are driving a combination vehicle when the trailer breaks away, pulling apart both air lines. You would expect the trailer brakes to come on anda)...
A trailer is most likely to jackknife when it is
A trailer is most likely to jackknife when it isa) Loaded to full capacityb) Emptyc) OverloadedAnswer: b) Em...
The front trailer supports are up, and the trailer is resting on the tractor. Make sure that
The front trailer supports are up, and the trailer is resting on the tractor. Make sure thata) The safety latch is in the unlocked positionb) There is...
Air lines on a combination vehicle are often colored to keep them from getting mixed up. The emergency line is ___; the service line is ___.
Air lines on a combination vehicle are often colored to keep them from getting mixed up. The emergency line is ___; the service line is ___.a) Back; yellowb)Blue;...
While you are driving, your emergency air line breaks or gets pulled apart. The loss of pressure will cause the
While you are driving, your emergency air line breaks or gets pulled apart. The loss of pressure will cause thea) Trailer supply valve to openb) Air compressor...
Describe what the trailer air supply controls does
Describe what the trailer air supply controls doesa) It is a device used to keep the trailer behind the tractorb) It is used to supply the trailer with...
If the brakes did not release when you pushed the trailer air supply valve, you should
If the brakes did not release when you pushed the trailer air supply valve, you shoulda) Check the air line connectionsb) Cross the air linesc) Check...
You have a major leak in the service line, and you apply the brakes. Service air pressure will escape and cause the
You have a major leak in the service line, and you apply the brakes. Service air pressure will escape and cause thea) Tractor spring brakes to lock onb)...
After connecting the air lines but before backing under the trailer, you should
After connecting the air lines but before backing under the trailer, you shoulda) Make sure that the trailer brakes are offb) Supply air to the trailer...
What is the emergency air line for?
What is the emergency air line for?a) To engage the front brakes of the tractor in case of an emergencyb) To engage the trailer brakes in case of air...
Which of the following is true about off-tracking or "cheating?"
Which of the following is true about off-tracking or "cheating?"a) The rear wheels follow the same path as the front wheelsb) If there is more than one...
In general, the higher your truck's center of gravity, the
In general, the higher your truck's center of gravity, thea) Easier it is to turn overb) Easier it is to turn around cornersc) More stable it is when...
If you have coupled with a semi-trailer, where should you put the front trailer supports before driving away?
If you have coupled with a semi-trailer, where should you put the front trailer supports before driving away?a) Raised halfway with the crank handle secured...
How much space should there be between the upper and lower fifth wheel after coupling?
How much space should there be between the upper and lower fifth wheel after coupling?a) About ¼ inchb) Just enough to see light through itc) NoneAnswer: c)...
Where should the tractor be when you inspect the landing gear after uncoupling the trailer?
Where should the tractor be when you inspect the landing gear after uncoupling the trailer?a) Completely cleared from the trailerb) With the fifth wheel...
The hand valve should be used
The hand valve should be useda) Only with the foot brakeb) Only when the trailer is fully loadedc) To test the trailer brakesAnswer: c) To test the...
When should you use chocks to park a trailer not equipped with spring brakes?
When should you use chocks to park a trailer not equipped with spring brakes?a) Only when it will be parked on an inclineb) Neverc) AlwaysAnswer: c)...
Why should you lock the tractor glad hands (or dummy couplers) to each other when you are not towing a trailer?
Why should you lock the tractor glad hands (or dummy couplers) to each other when you are not towing a trailer?a) If you don't, you will never build system...
While you are driving a combination vehicle, if the service line comes apart but the emergency line stays together, what will happen right away?
While you are driving a combination vehicle, if the service line comes apart but the emergency line stays together, what will happen right away?a) Nothing...
How should you test the tractor-semitrailer connection for security?
How should you test the tractor-semitrailer connection for security?a) Pull gently forward in low gear against the locked trailer brakes; then look at...
Almost half of all truck driver deaths are the result of
Almost half of all truck driver deaths are the result ofa) Speedb) Following too closelyc) RolloversAnswer: c) Rollov...
Which type of truck-trailer combination has the greatest chance of a "crack-the-whip" rollover?
Which type of truck-trailer combination has the greatest chance of a "crack-the-whip" rollover?a) A tractor pulling two trailersb) A tractor pulling three...
When you drive a set of doubles, which shut-off valve must be closed in the last trailer?
When you drive a set of doubles, which shut-off valve must be closed in the last trailer?a) Backb) Frontc) Middle sectionAnswer: a) B...
A tractor with a(n) ____ trailer requires the shortest amount of stopping distance
A tractor with a(n) ____ trailer requires the shortest amount of stopping distancea)Lightly loadedb) Emptyc) Fully loadedAnswer: c) Fully loa...
Semi-trailers made before 1975 that are equipped with air brakes
Semi-trailers made before 1975 that are equipped with air brakesa) Are easier to brake because they are heavierb) Often do not have spring brakesc) Usually...
If you do not do the final air brake check for air leaks and fix them before driving,
If you do not do the final air brake check for air leaks and fix them before driving,a) Tire pressure will dropb) You could lose your brakes while drivingc)...
You should not use the trailer hand brake to straighten out a jackknifing trailer, because
You should not use the trailer hand brake to straighten out a jackknifing trailer, becausea) The brake handle is too hard to reachb) The brakes on the...
When should you use chocks to park a trailer not equipped with spring brakes?
When should you use chocks to park a trailer not equipped with spring brakes?a) Low gearb) Intermediate gearc) High gearAnswer: a) Low g...
You are coupling a tractor to a semi-trailer. You have backed up but are not yet under it. Before backing under the semi-trailer, you should hook up
You are coupling a tractor to a semi-trailer. You have backed up but are not yet under it. Before backing under the semi-trailer, you should hook upa)...
Before you back under a trailer, make sure that
Before you back under a trailer, make sure thata)The air brakes are offb) The air supply knob is inc) The trailer brakes are lockedAnswer: c) The...
To stop a trailer skid, you should
To stop a trailer skid, you shoulda) Use the trailer hand brakesb) Counter steerc) Release the brakesAnswer: c) Release the bra...
Trucks roll over more easily when fully loaded and are
Trucks roll over more easily when fully loaded and area) Five times more likely to roll over in a crash than empty rigsb) Ten times more likely to roll...
Here are two things that a driver can do to prevent a rollover: Keep the cargo as close to the ground as possible, and
Here are two things that a driver can do to prevent a rollover: Keep the cargo as close to the ground as possible, anda) Keep the fifth wheel's free play...
Which of these vehicles off-tracks the most?
Which of these vehicles off-tracks the most?a) A 5-axle tractor towing a 52-foot trailerb) A 5-axle tractor towing a 42-foot trailerc) A 5-axle tractor...
When connecting the glad hands, press the two seals together with the couplers at what angle to each other?
When connecting the glad hands, press the two seals together with the couplers at what angle to each other?a) 45 degreesb) 180 degreesc) 90 degreesAnswer: c)...
The air leakage rate for a combination vehicle (engine off, brakes on) should not be more than ___ psi per minute.
The air leakage rate for a combination vehicle (engine off, brakes on) should not be more than ___ psi per minute.a) 2b) 4c) 6Answer: b)...
The fifth wheel locking lever is not locked after the jaws close around the kingpin. This means that
The fifth wheel locking lever is not locked after the jaws close around the kingpin. This means thata) The coupling is not right and should be fixed before...
When should you use the hand valve to park a combination vehicle?
When should you use the hand valve to park a combination vehicle?a) Neverb) To park at loading docksc) To park on a gradeAnswer: a) Ne...
You are uncoupling a trailer. After you shut off the trailer air supply and lock the trailer brakes, you should
You are uncoupling a trailer. After you shut off the trailer air supply and lock the trailer brakes, you shoulda) Back up gently to ease pressure on the...
Which part of the kingpin should the locking jaws close around?
Which part of the kingpin should the locking jaws close around?a) The baseb) The shankc) The headAnswer: b) The sh...
What is a tractor jackknife?
What is a tractor jackknife?a) When you lock up the drive tires on the trailer and the trailer spins out sideways as the tractor continues to push forwardb)...
While you check if the rear trailer is securely coupled to the front trailer, the landing gear should be
While you check if the rear trailer is securely coupled to the front trailer, the landing gear should bea) Slightly raisedb) Fully loweredc) Fully raisedAnswer: a)...
When you get ready to back under the semi-trailer, you should line up
When you get ready to back under the semi-trailer, you should line upa) The kingpin to engage the driver's side locking jaw firstb) Directly in front...
Which statement best explains the "crack-the-whip" effect?
Which statement best explains the "crack-the-whip" effect?a) Your trailer is half full, and the cargo is loaded in the front of the trailer. When you...
After you lock the kingpin into the fifth wheel, you should check the connection by pulling
After you lock the kingpin into the fifth wheel, you should check the connection by pullinga) Forward 50 feet, then turning right, and then leftb) The...
When you are uncoupling a loaded trailer, lower the landing gear until it
When you are uncoupling a loaded trailer, lower the landing gear until ita) Reaches the groundb) Makes firm contact with the groundc) Makes contact with...
How long does it take a typical tractor-trailer to clear a single railroad track? A double track?
How long does it take a typical tractor-trailer to clear a single railroad track? A double track?a) It takes 7 seconds to clear a single track and more...
You should use chocks when parking a trailer without spring brakes because
You should use chocks when parking a trailer without spring brakes becausea) Some states require chocking of trailer wheelsb) You don't want the trailer...
The best way to tell if your trailer has started to skid is to
The best way to tell if your trailer has started to skid is toa) Hear the wheels skiddingb) See it in your mirrorsc) Feel for "pulling" in the cabAnswer: b)...
Which of these statements is true?
Which of these statements is true?a) Light vehicles need more braking power to stop than heavy onesb) "Bobtail" tractors can take longer to stop than...
The best way to tell if your trailer has started to skid is to
The best way to tell if your trailer has started to skid is toa) See it in your mirrorsb) Feel for "pulling" in the cabc) Hear the wheels skiddingAnswer: a)...
Which of these statement is true?
Which of these statement is true?a) Always delay braking a heavy vehicle until you have no other choiceb) "Bobtail" tractors can take longer to stop than...
What are the other names for the service air line?
What are the other names for the service air line?a) Control line and signal lineb) Straight line and control linec) Curved line and signal lineAnswer: a)...
The tractor protection valve will close and the trailer ___ brakes will come on when there is a major leak in the brake line
The tractor protection valve will close and the trailer ___ brakes will come on when there is a major leak in the brake linea) Emergencyb) Servicec) ParkingAnswer: a)...
You should use chock when parking a trailer without spring brakes because
You should use chock when parking a trailer without spring brakes becausea) If the air supply leaks away, there will be no brakesb) You don't want the...
To unlock the fifth wheel, pull the release handle to the ___ position
To unlock the fifth wheel, pull the release handle to the ___ positiona) Neutralb) Closedc) OpenAnswer: c) O...
When checking the trailer emergency brakes, make sure that the tractor protection control valve is placed in the ___ position
When checking the trailer emergency brakes, make sure that the tractor protection control valve is placed in the ___ positiona) Normalb) Neutralc) EmergencyAnswer: c)...
When backing a tractor under a trailer, you should
When backing a tractor under a trailer, you shoulda) Do it quickly to ensure that the kingpin is locked into the fifth wheelb) Always approach the trailer...
What gear should the tractor engine be in after you uncouple the trailer and are inspecting the trailer supports
What gear should the tractor engine be in after you uncouple the trailer and are inspecting the trailer supportsa) High reverseb) Low reversec) NeutralAnswer: c)...
What is the safest way for you to make a turn without entering another traffic lane?
What is the safest way for you to make a turn without entering another traffic lane?a) If you must cross into the oncoming lane to make a turn and you...
Air and electrical lines from the tractor to the trailer should be
Air and electrical lines from the tractor to the trailer should bea) Resting on the frame of the tractorb) Secured but with enough slack for turnsc) Pulled...
At night, when a vehicle is carrying a load that extends four feet or more beyond the rear of the body, there must be ___ at the extreme end of the load.
At night, when a vehicle is carrying a load that extends four feet or more beyond the rear of the body, there must be ___ at the extreme end of the load.a)...
To unlock the fifth wheel, pull the release handle to the ___ position
To unlock the fifth wheel, pull the release handle to the ___ positiona) Neutralb) Openc) ClosedAnswer: b) O...
You are coupling a semi-trailer to your tractor but have not yet backed under it. The trailer is at the right height if
You are coupling a semi-trailer to your tractor but have not yet backed under it. The trailer is at the right height ifa) The end of the kingpin is even...
When you are uncoupling a loaded trailer, lower the landing gear until it
When you are uncoupling a loaded trailer, lower the landing gear until ita) Reaches the groundb) Makes contact with the ground, and leave the trailer...
When coupling, the proper position of the fifth wheel is
When coupling, the proper position of the fifth wheel isa) Titled down toward the end of the tractorb) Titled up toward the end of the tractorc) Level...
The iron trailer supports are up, and the trailer is resting on the tractor. Make sure that
The iron trailer supports are up, and the trailer is resting on the tractor. Make sure thata) There is enough clearance between the tractor frame and...
When you get ready to back under the semi-trailer, you should line up
When you get ready to back under the semi-trailer, you should line upa) About 12 degrees off the line of the trailerb) Directly in front of the trailerc)...
When should you use the hand valve to park a combination vehicle?
When should you use the hand valve to park a combination vehicle?a) To park on a gradeb) To park at loading docksc) NeverAnswer: c) Ne...
You cross the air lines when hooking up to an old trailer. What will happen?
You cross the air lines when hooking up to an old trailer. What will happen?a) The brake lights will come on when the brake pedal is pressedb) The hand...
When you turn suddenly while pulling doubles, which trailer is most likely to turn over?
When you turn suddenly while pulling doubles, which trailer is most likely to turn over?a) The front trailer is twice as likely to turn over as the tractorb)...
When should you use chocks to park a trailer not equipped with spring brakes?
When should you use chocks to park a trailer not equipped with spring brakes?a) Neverb) Alwaysc) Only when it will be parked on an inclineAnswer: b)...
Why should you make sure that the fifth wheel plate is greased as required?
Why should you make sure that the fifth wheel plate is greased as required?a) To ensure good electrical connectionsb) To prevent steering problemsc) To...
What is a tractor jackknife?
What is a tractor jackknife?a) When you lock up the drive tires on the tractor and the tractor spins out sideways as the trailer continues to push forwardb)...
What is the first step in coupling a tractor-semitrailer?
What is the first step in coupling a tractor-semitrailer?a) Check the trailer's heightb) Inspect the fifth wheelc) Secure the tractord) Connect all air...
What is the best way to test the trailer service brakes?
What is the best way to test the trailer service brakes?a) Pull forward very quickly, then apply the trailer brakes with your hand controlb) Try putting...
Where would you find the shut-off valves?
Where would you find the shut-off valves?a) In the front of a trailerb) In the front of the tractorc) In the rear of the tractord) In the rear of a trailerAnswer: d)...
During a walkaround inspection of a combination vehicle, you should check to make sure that
During a walkaround inspection of a combination vehicle, you should check to make sure thata) The kingpin is not damagedb) All locking pins are present...
Which of the following is NOT part of testing the tractor protection valve?
Which of the following is NOT part of testing the tractor protection valve?a) Pulling forward slowly, then applying the trailer brakesb) Pressing the...
Which of the following is NOT part of checking that air is flowing to all trailers?
Which of the following is NOT part of checking that air is flowing to all trailers?a) Going to the rear of the rigb) Pressing the pedal several times...
Which of the following could happen if you try to couple when the trailer is too high?
Which of the following could happen if you try to couple when the trailer is too high?a) It might not couple correctlyb) You could damage the trailer...
Which of the following types of vehicle gets stuck on railroad crossings most often?
Which of the following types of vehicle gets stuck on railroad crossings most often?a) Single-axle tractors pulling a long trailer with its landing gear...
While uncoupling, what should you do AFTER you unlock the fifth wheel?
While uncoupling, what should you do AFTER you unlock the fifth wheel?a) Lower your landing gearb) Disconnect your air linesc) Position your rigd) Pull...
After coupling, how much space should there be between the lower and upper fifth wheel?
After coupling, how much space should there be between the lower and upper fifth wheel?a) 1 footb) 24-36 inchesc) Noned) 5 feetAnswer: c) N...
Which of the following is NOT part of inspecting the coupling?
Which of the following is NOT part of inspecting the coupling?a) Checking that the locking lever is in the correct ("lock") positionb) Driving a few feet...
To drive, how high do you need to raise the landing gear?
To drive, how high do you need to raise the landing gear?a) Part of the way upb) Exactly 6 feet off the groundc) Only slightly off the ground so that...
Which of the following is NOT a way to tell if your trailer is equipped with an antilock braking system (ABS)?
Which of the following is NOT a way to tell if your trailer is equipped with an antilock braking system (ABS)?a) You can see wheel speed sensor wires...
To prevent a rollover while driving a combination vehicle, the two most important things are
To prevent a rollover while driving a combination vehicle, the two most important things area) Keeping cargo near the center of the vehicle and driving...
If you use the trailer hand valve while driving,
If you use the trailer hand valve while driving,a) You might make the trailer skidb) If might cause the vehicle to start moving too quicklyc) You might...
To straighten out a jackknifing trailer, should you apply your hand brake?
To straighten out a jackknifing trailer, should you apply your hand brake?a) No, because the brakes on the trailer wheels are what caused the skid to...
Which of the following is NOT true about an antilock braking system (ABS)?
Which of the following is NOT true about an antilock braking system (ABS)?a) You will find it on all tractors built after March 1998b) It only activates...
Which of the following controls air in the service line?
Which of the following controls air in the service line?a) The trailer had brakeb) Both the hand brake and the foot brakec) Neither the hand brake nor...
Which of the following is the definition of "offtracking?"
Which of the following is the definition of "offtracking?"a) How the rear wheels follow a different track than the front wheels in a turnb) Stopping for...
Which of the following is NOT a purpose of the emergency air line?
Which of the following is NOT a purpose of the emergency air line?a) To control a combination vehicle's emergency brakesb) To supply air to the trailer's...
What does the trailer air supply control do?
What does the trailer air supply control do?a) By pushing it in, you supply the tires with airb) By pushing it in, you supply the trailer with airc) By...
When parking a vehicle that does not have spring brakes, you should use chocks
When parking a vehicle that does not have spring brakes, you should use chocksa) To keep the trailer from offtracking so muchb) To stop the trailer from...
Which of the following should you do if you want to back into a curved path on the driver's side?
Which of the following should you do if you want to back into a curved path on the driver's side?a) Drive slowly while you are backingb) Use your mirrors...
When you check the lower fifth wheel, you do NOT need to check
When you check the lower fifth wheel, you do NOT need to checka) That there are no missing partsb) That you cannot see any space between the upper and...
Which of the following is most likely to roll over?
Which of the following is most likely to roll over?a) The rear trailer of a tripleb) The middle trailer of a triplec) The rear trailer of a doubled) The...
In a dual brake system, if one air system is very low on pressure:
In a dual brake system, if one air system is very low on pressure:Answer: Either the front or rear brakes will not be operating fu...
The air brake endorsement:
The air brake endorsement:Answer: Must be present when using a vehicle with air bra...
Pressing and releasing the brake pedal unnecessarily can:
Pressing and releasing the brake pedal unnecessarily can:Answer: Let air out faster than it can be repla...
Before driving a vehicle with a dual brake system, the driver should:
Before driving a vehicle with a dual brake system, the driver should:Answer: Let the air compressor build up a minimum of 100 psi pressure in the...
What were front brake limiting valves used for?
What were front brake limiting valves used for?Answer: To prevent skidding by the front ti...
Pressing and releasing the brake pedal unnecessarily can
Pressing and releasing the brake pedal unnecessarily canAnswer: Let air out faster than it can be repla...
What does the air compressor governor do?
What does the air compressor governor do?Answer: Controls when the air compressor pumps air into the air storage ta...
The brake pedal is part of which braking system?
The brake pedal is part of which braking system?Answer: Service brake sys...
Where are ABS malfunction lamps located?
Where are ABS malfunction lamps located?Answer: on the instrumental pa...
Truck tractors with air brakes built after March 1, 1997 must have:
Truck tractors with air brakes built after March 1, 1997 must have:Answer: Antilock braking sys...
What must be on all air tanks with air -braked vehicles?
What must be on all air tanks with air -braked vehicles?Answer: a check va...
What part of the truck is the air compressor connected to?
What part of the truck is the air compressor connected to?Answer: Eng...
Before driving a vehicle with a dual air system, you must wait until the air compressor builds a minimum of ___ psi in both the primary and secondary systems.
Before driving a vehicle with a dual air system, you must wait until the air compressor builds a minimum of ___ psi in both the primary and secondary...
What kind of force must emergency brakes use?
What kind of force must emergency brakes use?Answer: Mechani...
With brake drums, what happens if brakes become too hot?
With brake drums, what happens if brakes become too hot?Answer: the brakes may stop work...
If the air pressure warning light comes on, you should:
If the air pressure warning light comes on, you should:Answer: Safely exit the roadway and s...
Before driving a vehicle with a dual brake system, the driver should:
Before driving a vehicle with a dual brake system, the driver should:Answer: Let the air compressor build up a minimum of 100 psi pressure in the...
A dual air brake system:
A dual air brake system:Answer: Has two separate air brake systems which use a single set of contr...
Why do some air brake systems use alcohol?
Why do some air brake systems use alcohol?Answer: To reduce the risk of ice in air brake valves during cold weat...
When do the spring brakes come on?
When do the spring brakes come on?Answer: When main air pressure is l...
The air storage tanks:
The air storage tanks:Answer: Hold enough air so the brakes could be used several times if the compressor stops work...
When the brake pedal is pushed down, air brakes work:
When the brake pedal is pushed down, air brakes work:Answer: After a short de...
What can happen if the parking brakes are used in very wet weather?
What can happen if the parking brakes are used in very wet weather?Answer: The brakes may freeze so the vehicle cannot m...
The safety valve located on the first tank opens:
The safety valve located on the first tank opens:Answer: If there is too much press...
When you are going down a long or steep grade after selecting the proper gear, the proper method of braking is to brake until your speed is about __ miles per hour below your "safe" speed and then release your brakes.
When you are going down a long or steep grade after selecting the proper gear, the proper method of braking is to brake until your speed is about __ miles...
What factors can cause brakes to fade or fail?
What factors can cause brakes to fade or fail?Answer: Overheating, low air pressure and not relying on the engine braking eff...
The parking or emergency brakes of trucks or buses can legally be held on by _____ pressure.
The parking or emergency brakes of trucks or buses can legally be held on by _____ pressure.Answer: spr...
The driver must be able to see a low pressure warning, which comes on before pressure in the service air tank falls below ___ psi.
The driver must be able to see a low pressure warning, which comes on before pressure in the service air tank falls below ___ psi.Answer: ...
How do brakes work on a long, steep downgrade?
How do brakes work on a long, steep downgrade?Answer: As a supplement to the braking effect of your eng...
The safety valve is set to automatically reduce pressure at __ psi.
The safety valve is set to automatically reduce pressure at __ psi.Answer: ...
In ideal conditions, a truck or bus equipped with an air brake and traveling at 55 mph would require what stopping distance?
In ideal conditions, a truck or bus equipped with an air brake and traveling at 55 mph would require what stopping distance?Answer: More than 450...
Which of the following is true about your brake function if your ABS fails?
Which of the following is true about your brake function if your ABS fails?Answer: you will have normal brake function, but you will need to get...
Generally, why must you take an exam about air brakes?
Generally, why must you take an exam about air brakes?Answer: Otherwise, you will have to get a CDL with restricti...
The maximum leakage rates per minute after the initial drop are
The maximum leakage rates per minute after the initial drop areAnswer: 3 psi for single vehicle and 4psi for a combination vehic...
Which conditions are front wheel brakes good under?
Which conditions are front wheel brakes good under?Answer: All weather conditi...
Which of the following is NOT part of the air-brake system?
Which of the following is NOT part of the air-brake system?Answer: Radio signal sys...
What is the best way to test your vehicle's low air pressure warning signal?
What is the best way to test your vehicle's low air pressure warning signal?Answer: step on and off the brake pedal with the engine off to reduce...
How can you tell if your vehicle is equipped with an anti-lock braking system?
How can you tell if your vehicle is equipped with an anti-lock braking system?Answer: if the vehicle is manufactured after 1...
The purpose of a supply pressure gauge is
The purpose of a supply pressure gauge isAnswer: to tell you how much air is in the t...
Which of the following is a reason that air tanks must be drained?
Which of the following is a reason that air tanks must be drained?Answer: your brakes may fail due to the water freez...
Which of the following is NOT part of the braking process when driving a tractor-trailer combination vehicle with ABS?
Which of the following is NOT part of the braking process when driving a tractor-trailer combination vehicle with ABS?Answer: you should drive more...
When should you use the parking brake?
When should you use the parking brake?Answer: overtime you leave your vehicle, with rare excepti...
Which vehicles must have low air pressure warning signals?
Which vehicles must have low air pressure warning signals?Answer: All vehicles with air brakes currently in operation must have low air pressure...
When should you drain your air tanks?
When should you drain your air tanks?Answer: At the end of each working ...
Which of the following is NOT part of the drum brake?
Which of the following is NOT part of the drum brake?Answer: Safety va...
How would you check your truck's slack adjusters?
How would you check your truck's slack adjusters?Answer: Use gloves and pull hard on each slack adjuster you can re...
Which of the following does ABS do?
Which of the following does ABS do?Answer: Activates when the wheels are bout to lock...
At what measurement is the safety valve USUALLY set to open?
At what measurement is the safety valve USUALLY set to open?Answer: 150 ...
If you must make an emergency stop, brake so you:
If you must make an emergency stop, brake so you:Answer: can steer and your vehicle stays in a straight l...
All air brakes equipped vehicles have:
All air brakes equipped vehicles have:Answer: a supply pressure ga...
The application pressure gauge shows how much air pressure you:
The application pressure gauge shows how much air pressure you:Answer: are applying to the bra...
The air pressure loss of a single vehicle or bus with truck off and brakes applied could be:
The air pressure loss of a single vehicle or bus with truck off and brakes applied could be:Answer: 3psi. ... {rule if brakes are applied or being...
For long downhill grades, experts recommend light steady pressure on pedal instead of repeated braking, why?
For long downhill grades, experts recommend light steady pressure on pedal instead of repeated braking, why?Answer: Air usage is less preventing...
The only part of the S-cam brake that does not move is:
The only part of the S-cam brake that does not move is:Answer: the "S" ...
If pressure does not build up fast enough, your pressure may drop too low while driving requiring an emergency stop therefore:
If pressure does not build up fast enough, your pressure may drop too low while driving requiring an emergency stop therefore:Answer: Don't drive...
While driving, the low air pressure indicator turns on, how do you alert other drivers of the problem?
While driving, the low air pressure indicator turns on, how do you alert other drivers of the problem?Answer: Using your Bra...
The hand brake of heavy vehicles are of distinct colors and shapes:
The hand brake of heavy vehicles are of distinct colors and shapes:Answer: Yellow Dimond (Tractor)- Red Octagon ( Trail...
The hand brake is used to:
The hand brake is used to:Answer: Release and apply bra...
The air pressure loss of a combination vehicle with the truck off and brakes applied could be:
The air pressure loss of a combination vehicle with the truck off and brakes applied could be:Answer: 4 psi ... {Rule: If your brakes are applied...
The spring brakes or emergency brakes pop when air pressure in the tank is about
The spring brakes or emergency brakes pop when air pressure in the tank is aboutAnswer: 20-40...
When air pressure reaches 100 psi, what happens in the tank?
When air pressure reaches 100 psi, what happens in the tank?Answer: the compressor turn...
The safety relief valve in an air system opens when the compressor fails to cut off and pressure in the tank reaches:
The safety relief valve in an air system opens when the compressor fails to cut off and pressure in the tank reaches:Answer: 150 ...
The red warning lights turns on in an air system when you are losing pressure and it reaches:
The red warning lights turns on in an air system when you are losing pressure and it reaches:Answer: 60...
The air brake system is fully loaded at :
The air brake system is fully loaded at :Answer: 125 ...
Cracks in disc brakes should not be more than:
Cracks in disc brakes should not be more than:Answer: 1/2 of the width of the area of frict...
On a long steep hill, air brakes are supplemented by:
On a long steep hill, air brakes are supplemented by:Answer: Engine retard...
When moving downhill, at what speed do you release the brake?
When moving downhill, at what speed do you release the brake?Answer: 5...
On a highway, how many seconds of separation should there be between one vehicle and another:
On a highway, how many seconds of separation should there be between one vehicle and another:Answer: ...
How can you test the slack adjusters of the S-cam brakes?
How can you test the slack adjusters of the S-cam brakes?Answer: Pull hard on each slack adjuster with your hand and see if it mo...
Slack adjusters need to be adjusted if after pulling with hand they move more than:
Slack adjusters need to be adjusted if after pulling with hand they move more than:Answer: 1 i...
What is normal pressure in an air system indicating vehicle is good to drive?
What is normal pressure in an air system indicating vehicle is good to drive?Answer: 90-120 ...
The modulating control valves are used to:
The modulating control valves are used to:Answer: slowly apply the spring bra...
The manual valve of the trailer (Johnson) should not be used to:
The manual valve of the trailer (Johnson) should not be used to:Answer: parked the vehi...
The manual valve of the trailer is used to
The manual valve of the trailer is used toAnswer: test the trailer bra...
The excessive use of the service brake can result in:
The excessive use of the service brake can result in:Answer: Over heating of brakes leading to brake fading or brake fail...
Under normal conditions, to apply the hand brake, the driver must first:
Under normal conditions, to apply the hand brake, the driver must first:Answer: Release air from the air sys...
For an average driver, good traction and good brakes, the total stopping distance is:
For an average driver, good traction and good brakes, the total stopping distance is:Answer: More than 30...
When the spring brakes are applied, you should not:
When the spring brakes are applied, you should not:Answer: Push down on brake pe...
How many pounds of pressure must be built by the compressor in a double air system before driving?
How many pounds of pressure must be built by the compressor in a double air system before driving?Answer: 100 ...
The compressor in an air system shuts off when the air supply reaches:
The compressor in an air system shuts off when the air supply reaches:Answer: 125 ...
Brake lights are activated by:
Brake lights are activated by:Answer: Electrical switch which is activated by the air pressure on the brake pe...
The time it takes the air brakes to work at 55MPH on dry pavement is:
The time it takes the air brakes to work at 55MPH on dry pavement is:Answer: 32ft while brak...
The proper procedure for inspecting air tanks for oil contamination is:
The proper procedure for inspecting air tanks for oil contamination is:Answer: Open the tank petcock and allow tanks to dr...
If the air compressor has its own oil supply or if it is lubricated by engine oil, when should you check it for the first time?
If the air compressor has its own oil supply or if it is lubricated by engine oil, when should you check it for the first time?Answer: Before you...
How does the service brake work to stop the vehicle?
How does the service brake work to stop the vehicle?Answer: The brake shoes and linings are pushed against the inside of the d...
When the engine is at operating RPM, the pressure should build from 85 to 100 psi in:
When the engine is at operating RPM, the pressure should build from 85 to 100 psi in:Answer: 45 seco...
Which of the following makes total stopping distance longer for air brakes than hydraulic brakes?
Which of the following makes total stopping distance longer for air brakes than hydraulic brakes?Answer: Brake ...
You know your brakes are fading when you feel that:
You know your brakes are fading when you feel that:Answer: You have to push harder on the brake pedal to control your speed downgr...
Which of these is the first thing to do when a low air pressure warning comes on?
Which of these is the first thing to do when a low air pressure warning comes on?Answer: Stop and safely park as soon as possi...
Use the parking brakes:
Use the parking brakes:Answer: Any time when parking. except when brakes are very hot or wet in freezing temperatur...
Air braking takes more time than hydraulic braking because air brakes:
Air braking takes more time than hydraulic braking because air brakes:Answer: Need to have air flow through the lines to w...
To test service brakes you should brake firmly when moving slowly forward. The brakes are OK if you notice what?
To test service brakes you should brake firmly when moving slowly forward. The brakes are OK if you notice what?Answer: Vehicle stops w...
If you make an emergency stop, how should you brake?
If you make an emergency stop, how should you brake?Answer: You brake so you can steer and your vehicle stays in a straight l...
A combination vehicle with air brake system with the engine off and brakes released, should not lose more than:
A combination vehicle with air brake system with the engine off and brakes released, should not lose more than:Answer: 3 PSI (Rule: If your brakes...
A straight truck or bus with air brake system, whit engine off and brakes released should not lose more than:
A straight truck or bus with air brake system, whit engine off and brakes released should not lose more than:Answer: 2 PSI ( Rule: If your brakes...
Your vehicle has a dual air brake system. If a low air warning comes on for the secondary system, what should you do?
Your vehicle has a dual air brake system. If a low air warning comes on for the secondary system, what should you do?Answer: Bring the vehicle to...
To check for free play in a manual slack adjuster, you need:
To check for free play in a manual slack adjuster, you need:Answer: Park on level ground, chock the wheels and release parking bra...
In air brake vehicles, the parking brakes should be used how?
In air brake vehicles, the parking brakes should be used how?Answer: Any time the vehicle is par...
The braking power of the spring brakes:
The braking power of the spring brakes:Answer: Depends on the adjustment of the service bra...
If your truck or bus has dual parking control valves, you can use pressure from a separate tank for what purpose?
If your truck or bus has dual parking control valves, you can use pressure from a separate tank for what purpose?Answer: To release the emergency...
Front brake limiting valves are used to:
Front brake limiting valves are used to:Answer: Reduce the chance of front wheel sk...
What does the application pressure gauge shows you?
What does the application pressure gauge shows you?Answer: It shows how much air pressure you are applying to the bra...
The parking and emergency brake on a heavy vehicle can only be held in position by something that can not leak away such as:
The parking and emergency brake on a heavy vehicle can only be held in position by something that can not leak away such as:Answer: Spring press...
During Normal driving, parking and emergency brakes are usually held back by?
During Normal driving, parking and emergency brakes are usually held back by?Answer: Air press...
The driver must be able to see a warning light that is given when air pressure in the service tanks falls bellow:
The driver must be able to see a warning light that is given when air pressure in the service tanks falls bellow:Answer: 60 ...
Vehicle with air brakes must have:
Vehicle with air brakes must have:Answer: An air pressure gauge to show the pressure available for brak...
Why drain water from compressed air tanks?
Why drain water from compressed air tanks?Answer: Water can freeze in cold weather and cause brake fail...
If your vehicle has an alcohol evaporator, everyday during cold weather what should you do?
If your vehicle has an alcohol evaporator, everyday during cold weather what should you do?Answer: Check and fill the alcohol le...
The brake pedal in an air brake system:
The brake pedal in an air brake system:Answer: Controls the air pressure applied to put on bra...
If your vehicle has an alcohol evaporator, why is it there?
If your vehicle has an alcohol evaporator, why is it there?Answer: To reduce the risk of ice in air brake valves in cold weat...
Oil and water that collects in air tanks can make brakes fail. If you do not have automatic tank drains, when should you drain the air tanks?
Oil and water that collects in air tanks can make brakes fail. If you do not have automatic tank drains, when should you drain the air tanks?Answer: Every...
What does the air compressor governor do?
What does the air compressor governor do?Answer: It controls when air is pumped into the air ta...
Modern air brake systems combine three different systems. They are the service brakes, the parking brakes and the :
Modern air brake systems combine three different systems. They are the service brakes, the parking brakes and the :Answer: Emergency br...
When your vehicle is empty, start braking:
When your vehicle is empty, start braking:Answer: Sooner than when loa...
Which of the following is true about your brake function if your ABS fails?
Which of the following is true about your brake function if your ABS fails?Answer: You will still have normal brake function, but you will need to...
Which vehicles must have low air pressure warning signals?
Which vehicles must have low air pressure warning signals?Answer: All vehicles with air brakes currently in operation must have low air pressure...
What is the best way to test your vehicle's low air pressure warning signal?
What is the best way to test your vehicle's low air pressure warning signal?Answer: Step on and off the brake pedal with the engine off to reduce...
Which of the following is NOT part of the braking process when driving a tractor-trailer combination vehicle with ABS?
Which of the following is NOT part of the braking process when driving a tractor-trailer combination vehicle with ABS?Answer: You should drive more...
At what measurement is the safety valve USUALLY set to open?
At what measurement is the safety valve USUALLY set to open?Answer: 150 ...
The tractor protection valve.
The tractor protection valve.Answer: Provides the air supply for the brake system, Is closed by the parking brakes, Will close itself automatically...
The maximum leakage rates per minute after the initial drop are.
The maximum leakage rates per minute after the initial drop are.Answer: 3 psi for single vehicles and 4 psi for combination vehic...
Which of the following is NOT part of the drum brake?
Which of the following is NOT part of the drum brake?Answer: Safety va...
Which of the following is a reason that air tanks must be drained?
Which of the following is a reason that air tanks must be drained?Answer: Your brakes may fail due to the water freez...
Which of the following should you do before leaving your vehicle unattended?
Which of the following should you do before leaving your vehicle unattended?Answer: Chock the wheels, Put on the parking brakes, Remove the k...
Which of the following factors can cause brakes to fail or fade?
Which of the following factors can cause brakes to fail or fade?Answer: Brakes being out of adjustments, Excessive use of the service brakes, Not...
Which conditions are front wheel brakes good under?
Which conditions are front wheel brakes good under?Answer: All weather conditi...
What is the best way to test if your vehicle's spring brakes come on automatically?
What is the best way to test if your vehicle's spring brakes come on automatically?Answer: On tractor-trailer vehicles, continue to step on and off...
How would you check your truck's slack adjusters?
How would you check your truck's slack adjusters?Answer: Use gloves and hard on each slack adjusters you can re...
Which of the following is NOT part of the air-brake system?
Which of the following is NOT part of the air-brake system?Answer: Radio signal sys...
Slack adjustments are?
Slack adjustments are?Answer: Part of your air brake system used to adjust the brakes, between the power screw and push rod on disk brakes, between...
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