A vehicle contains 500 pounds each of Explosives 1.1 and 1.2. Use:

a) "Explosive 1.1" placards

b) "Dangerous" placards

c) "Explosive" and "Dangerous" placards

Answer: a) "Explosive 1.1" placards

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 materials

b) Carrier must report a spill of this material

c) Weight column may be blank

Answer: b) Carrier must report a spill of this material

Which of the following items must drivers have in their possession while transporting Explosives 1.1 or 1.2?

a) The written route plan

b) The carrier's insurance policy

c) Extra hazardous materials labels

Answer: a) The written route plan

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

a) Corrosives and oxidizers

b) Explosives A and B

c) Acids and poisons

Answer: b) Explosives A and B

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:

a) "Poison". Only if no other cargo requires it

b) "Poison" as well as the hazard class placards

c) "Poison" and remove all other placards

Answer: b) "Poison" as well as the hazard class placards

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:

a) Explosive 1.1 and 1.2

b) Acids and poisons

c) ORM-C,D and E

Answer: a) Explosive 1.1 and 1.2

When you discover a hazardous materials cargo leak, you should:

a) Use your sense of smell to identify the material

b) Identify the hazardous material

c) Immediately remove all leaking packages from the vehicle

Answer: b) Identify the hazardous material

When transporting packages of explosive, you must:

a) Keep bystanders 100 feet away

b) Roll the packages carefully, with no sharp or jarring actions

c) Never use hooks or other metal tools

Answer: c) Never use hooks or other metal tools

You vehicle is carrying chlorine. You only need to stop for railroad crossings when the shipment includes ___ of chlorine.

a) 110 gallons

b) 100 gallons

c) Any amount

Answer: c) Any amount

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 set

b) To use proper fuses or flares to mark the stopped vehicle

c) It is watched by a qualified person who will comply with all

Answer: c) It is watched by a qualified person who will comply with all

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 going

b) Have the loading observers sign off on the shipping papers

c) Close all manholes and valves to be sure they are free of leaks

Answer: c) Close all manholes and valves to be sure they are free of leaks

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) 25

b) 50

c) 100

Answer: b) 50

Your vehicle contains explosives, oxidizers, or flammables. No one may smoke within ___ feet of the vehicle.

a) 15

b) 25

c) 50

Answer: b) 25

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 by air, unless accepted

b) Extremely harmful to marine life

c) Only a reportable quantity if 100 or more pounds are spilled

Answer: a) Subject to Hazmat rules only when transported by air, unless accepted

Explosives 1.1 must not be transported in vehicle combinations that include:

a) Materials classified as ORM-D

b) Ago tank without baffles

c) Class 7 (radioactive) materials

Answer: c) Class 7 (radioactive) materials

When fueling a placarded vehicle, someone must always be:

a) At the nozzle, controlling the fuel flow

b) Within 10 feet of the pump with a fire extinguisher

c) At the emergency power shut-off for the pump

Answer: a) At the nozzle, controlling the fuel flow

When shippers package hazardous materials, they must certify the packaging was done according to the regulations. The only exception is if the:

a) Shipment is a hazardous waste

b) Driver is given a sealed cargo compartment

c) Shipper is a private carrier his or her own product

Answer: c) Shipper is a private carrier his or her own product

The quantity of the hazardous materials begins transported must appear on the shipping paper:

a) If the amount is a reportable quantity

b) At all times

c) It is exceeds 10 lbs

Answer: b) At all times

Which of the following signals may be used to warn of a stopped vehicle containing explosive?

a) Signal fires

b) Reflective triangles

c) Flares

Answer: b) Reflective triangles

The National Response Center:

a) Inspects any truck or bus involved in a hazardous materials accident

b) Helps coordinate the emergency response to chemical hazards

c) Checks that the shipper has properly labeled all hazardous material

Answer: b) Helps coordinate the emergency response to chemical hazards

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 door pouch

b) On your person

c) On the dashboard in clear view

Answer: a) In the driver's door pouch

If the words "Inhalation Hazard" are on the shipping paper or package, you must:

a) Substitute "Dangerous" placards for amounts more than 1,001 pounds

b) Display "Poison" placards in addition to any other needed placards

c) Not carry more than 2,000 lbs. of that substance

Answer: b) Display "Poison" placards in addition to any other needed placards

If you are loading or unloading any type of explosives, you must make sure the:

a) Heater fuel tanks are completely full

b) Engine is idling

c) Cargo heaters have been disabled

Answer: c) Cargo heaters have been disabled

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 only when transported by water, unless accepted

b) Appropriate for describing materials for international transportation

c) Appropriate for describing materials for domestic transportation

Answer: c) Appropriate for describing materials for domestic transportation

When can you transfer a flammable liquid from one tanker to another on a public roadway?

a) When it is an emergency situation

b) If it is an off-peak traffic period

c) Never transfer a flammable liquid from one tanker to another

Answer: a) When it is an emergency situation

Shipping names shown in italics in the Hazardous Material Tables:

a) Require extreme caution when handling

b) Are "Forbidden" materials

c) Are not proper shipping names

Answer: c) Are not proper shipping names

If you have a hazardous materials fire, while driving, you should:

a) Not attempt to control the fire

b) Remove all burning materials

c) Open the cargo doors

Answer: a) Not attempt to control the fire

Generally, the ___ must certify on the shipping paper that the shipment has been prepared in the correct manner.

a) Shipper

b) Carrier

c) Driver

Answer: a) Shipper

When carrying explosives and you have a breakdown or a crash, you should:

a) Leave the vehicle and go for help

b) Not allow smoking or fire near the vehicle

c) Immediately open and inspect the cargo

Answer: b) Not allow smoking or fire near the vehicle

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 container

b) A common carrier must never transport the materials

c) A shipment of that material must never be larger than the RQ

Answer: b) A common carrier must never transport the materials

Cylinders containing compressed gases may only be loaded onto a vehicle if the cylinders are:

a) Loaded upright or braced lying down flat

b) Bundled loosely together with steel strapping

c) Labeled "Non-flammable Gas"

Answer: a) Loaded upright or braced lying down flat

Who is responsible for finding out what permits or special routes you will need to transport hazardous materials?

a) The driver

b) The carrier

c) The shipper

Answer: a) The driver

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) Class 5 (oxidizers)

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 80 miles

b) 2 hours or 100 miles

c) 3 hours or 150 miles

Answer: b) 2 hours or 100 miles

The transport index of a radioactive material:

a) Another way of stating the package's weight

b) Tells the degree of control needed during transportation

c) Lets the ERT ignore the ID number on the placard

Answer: b) Tells the degree of control needed during transportation

You may not park a vehicle carrying hazardous materials within ___ feet of an open fire.

a) 300

b) 400

c) 500

Answer: a) 300

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, and the shipping distance

b) The material's hazard class, the amount of hazardous materials, and type of shipment

c) The amount of materials domestic or international travel designation, and shipper's certification

Answer: b) The material's hazard class, the amount of hazardous materials, and type of shipment

When loading or unloading any explosive, you should:

a) Use cargo hooks that are non-ferrous

b) Place damaged packages on top of the stack

c) Never use any cargo hooks or medal tolls

Answer: c) Never use any cargo hooks or medal tolls

An "X" in theHM column of a shipping paper means:

a) The material is not a hazardous material

b) This is an exception to the hazardous materials regulations

c) The entry is for hazardous materials

Answer: c) The entry is for hazardous materials

What should be fully engaged with no loose or missing pins in the slide mechanism of the sliding fifth wheel?

a) Gap

b) Locking pins

c) Sliding pintle

d) Locking jaws

Answer: b) Locking pins

What should be clean with no dirt, illegal stickers, obstructions or damages to the glass?

a) Windshield and mirrors

b) Lighting indicators

c) Headlights

d) None of the above

Answer: a) Windshield and mirrors

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?

a) Locking jaws

b) Splash guards

c) Door / ties / lifts

d) Air / electric lines

Answer: d) Air / electric lines

What is the container (hoses) for the mechanism that transforms steering column action into wheel action?

a) Steering box / hoses

b) Suspension

c) Steering play

d) Steering linkage

Answer: a) Steering box / hoses

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 mounts

b) Mounting bolts

c) Shock absorbers

d) Torque

Answer: a) Spring mounts

If the container is not part of the pressurized system, to check the coolant level,

a) Remove the container cap and check the level visible

b) Inspect the reservoir sight glass

c) You should do neither of the above

d) You can do either of the above

Answer: d) You can do either of the above

What structure supporting the fifth wheel skid plate should be checked for cracks or breaks?

a) Kingpin

b) Apron

c) Platform

d) Sliding pintle

Answer: c) Platform

Which gauge indicates the alternator or generator is charging?

a) Temperature

b) Oil pressure

c) Ammeter / voltmeter

d) All of the above

Answer: c) Ammeter / voltmeter

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 fluid

b) Oil level

c) Leaks

d) None of the above

Answer: c) Leaks

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.)

a) Locking pins

b) Apron

c) Release arm

d) Drawbar

Answer: c) Release arm

Gas or hydraulic devices that cushion the vehicle ride and stabilize the vehicle and should be secure without leaks are called

a) Springs

b) Brakes

c) Mounts

d) Shock absorbers

Answer: d) Shock absorbers

Which tires should have a minimum tread depth of 4/32 of an inch?

a) Spare tires

b) Non-drive axle tires

c) Steering axle tires

d) All of the above

Answer: c) Steering axle tires

What maintains air pressure in the air brake system?

a) Power steering / belt

b) Water pump / belt

c) Alternator / belt

d) Air compressor / belt

Answer: d) Air compressor / belt

Which gauge indicates increasing or normal lubrication pressure to prevent engine failure, seizure or breakdown?

a) Oil pressure

b) Temperatur

c) Ammeter

d) Power steering

Answer: a) Oil pressure

What should you check to be sure it is solid, clear of objects, and securely bolted to the tractor frame?

a) Platform

b) Catwalk

c) Kingpin

d) Apron

Answer: b) Catwalk

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 brakes

b) Parking brake

c) Hydraulic brake

d) All of the above

Answer: c) Hydraulic brake

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 chambers

b) Brake hoses / line

c) Brake drum / linings

d) All of the above

Answer: c) Brake drum / linings

What is the sliding mechanism and locking device for tandem axles on trailers?

a) Tandem release (arm/ locking pin)

b) Frame

c) Suspension system

d) Landing gear

Answer: a) Tandem release (arm/ locking pin)

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

a) slack adjusters

b) Shock absorbers

c) Brake linings

d) Brake chambers

Answer: a) slack adjusters

When checking the dipstick to see that the lubrication level is within the safe operating range, you are checking what?

a) Oil level

b) Coolant level

c) Power steering fluid level

d) None of the above

Answer: a) Oil level

What, if loose or missing, may cause movement between the frame and fifth wheel assembly?

a) Drawbar

b) Mounting bolts

c) Safety latch

d) Locking pin

Answer: d) Locking pin

What should not be bent, damaged, or rusted through and should be evenly centered with the dual wheels and tires evenly separated?

a) Rims

b) Lug nuts

c) Spacers

d) All of the above

Answer: c) Spacers

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 brake

b) Clutch/ gearshift

c) Water pump

d) Drive shaft

Answer: b) Clutch/ gearshift

To improve visibility during severe or stormy weather, what must be secure, undamaged, and operating smoothly and correctly?

a) Emergency equipment

b) Lighting indicators

c) Wipers/ washers

d) Heater/ defroster

Answer: c) Wipers/ washers

What should you make sure is secure and not leaking and its cap(s) are tight?

a) Fuel tank (s)

b) Air compressor

c) Water pump

d) All of the above

Answer: a) Fuel tank (s)

Which belt should you make sure is securely mounted and adjusts and latches properly?

a) Steering

b) Air compressor

c) Safety/ seat

d) Water pump

Answer: c) Safety/ seat

What transmits power from the transmission to the drive axle?

a) Air compressor belt

b) Driveshaft

c) Steering play

d) Power steering belt

Answer: b) Driveshaft

If the wheel has a sight glass, check that the oil level is adequate. Otherwise, look for leaks around the

a) Rims

b) Hydraulic brakes

c) Hub oil/ axle seals

d) Battery

Answer: c) Hub oil/ axle seals

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) Spacers

b) Lug nuts

c) Rims

d) None of the above

Answer: b) Lug nuts

Riding in the center portion of the lane:

Answer: Keeps others from sharing your lane

Vehicle/motorcycle crashes are most common:

Answer: At intersections

When riding with a passenger, you should:

Answer: Start slowing sonner

To reduce speed before turning:

Answer: Close the throttle and apply both brakes

When swerving, it is important to:

Answer: Separate braking from swerving

When carrying loads:

Answer: Keep the load to the rear of the motorcycle

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 and move away from the vehicle after entering the intersection

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 portion

While in a turn, it is best to:

Answer: Maintain a steady speed or gradually accelerate

To operate the throttle

Answer: Start with your wrist flat

Following closely to a vehicle in front of you:

Answer: Is a factor in crashes caused by motorcyclists

Not turning off a turn signal:

Answer: Encourages other drivers to pull into your path

Which one of the following statements is correct?

Answer: Press left, lean left, go left

Make a special point to use your mirrors when:

Answer: Slowing or stopping

Your motorcycle has two brakes. Use both brakes:

Answer: Every time you slow or stop

To create more space in the situation pictured below, you should:

Answer: Adjust your speed and stay in the center of the lane

To make good judgment in traffic, you need to first:

Answer: Search ahead

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 A

Before changing lanes to the left:

Answer: Check your left mirror and look to the left

In slow, tight turns:

Answer: Lean the motorcycle only and keep your body straight

Wearing a helmet will:

Answer: Reduce your chances of neck and head injuries

Most crash-involved riders:

Answer: Overbreak the rear tire

When the front tire goes flat while riding:

Answer: Apply the rear brake and steer to the edge of the road

Alcohol enters the bloodstream and quickly reaches the brain. Which of the following is affected first?

Answer: Judgment

If you have a flat tire while riding, hold the handle grips firmly and:

Answer: Use the brake of the good tire or avoid braking

To predict how a hazard may affect you, it's important to:

Answer: Know the speed, distance, and direction that the hazard is moving

With a properly adjusted mirror, you can see:

Answer: Part of the lane beside you and behind you

The single most important thing you can do to improve your chances of surviving a crash is to:

Answer: Wear a securely fastened helmet

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:

Answer: Imprisonment in a state prison for six years

If your throttle sticks:

Answer: Downshift and apply both brakes

To ride over metal bridge gratings as pictured below:

Answer: Ride straight across

When carrying loads:

Answer: Keep the load low and as far forward as possible

A group of riders move from a staggered formation into a single file when:

Answer: Turing corners

On a paved two-lane road, sand and gravel are most likely to collect:

Answer: Near the sides of the road

When following a vehicle, you should try to:

Answer: Ride where the driver can see you in the rear view mirror

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 left

Of the following, which one gives the most eye and face protection while riding?

Answer: A face shield

In the picture below, the car is waiting to enter the intersection. Usually, it is best for you to:

Answer: Slow and increase space

To cross tracks that run parallel to your course:

Answer: Edge gradually across

When you are being followed too closely, it is usually best to:

Answer: Drop back farther from the vehicle ahead

When carrying a passenger:

Answer: it takes longer to brake and accelerate

The ability to think clearly and ride safely is affected by as little as:

Answer: 1 drink

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 reduced

On a wet road, it will usually be most slippery:

Answer: In the center portion of the lane

To ride over an object on the road:

Answer: Rise slightly off the seat

When swerving, it is important to:

Answer: Separate braking from swerving

In a normal turn, lean your:

Answer: motorcycle and your body at the same angle

To see better when following a vehicle at night:

Answer: Use the headlights of the vehicle ahead

In the picture below, it is usually best to ride in which position?

Answer: Position 2 or 3

Compared with a straight truck or bus, there are ___ things to inspect in combination vehicles

a) The same number of

b) Fewer

c) More

Answer: c) More

The service line

a) Carries air to the cab of the rig to cool it

b) Carries air to the parking brake to control the trailer brakes

c) Carries air to a relay valve that allows the trailer brakes to be applied quickly

Answer: c) Carries air to a relay valve that allows the trailer brakes to be applied quickly

You should not back a tractor under a trailer until the whole air system is

a) At normal pressure

b) Between 60 and 80 psi

c) Bled down to half the maximum pressure

Answer: a) At normal pressure

You are coupling a tractor to a semi-trailer. You have connected the air lines. Before backing under the trailer, you should

a) Pull ahead to test the glad hands connections

b) Supply air to the trailer system and then pull out the air supply knob

c) Make sure that the trailer brakes are off

Answer: b) Supply air to the trailer system and then pull out the air supply knob

For coupling to be completed, the safety catch for the fifth wheel locking lever must be

a) Through the locking lever

b) Over the locking lever

c) Straight up

Answer: b) Over the locking lever

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 brakes

b) The foot brake sends air to all the brakes on the vehicles (including the trailer(s)).

c) Both of these statements are true

Answer: c) Both of these statements are true

You should not use the trailer hand valve while driving because

a) It won't work as well as the foot brake

b) You should use the parking brake

c) Of the danger of making the trailer skid

Answer: c) Of the danger of making the trailer skid

What is the emergency air line?

a) Air lines connecting the parking brake to the trailer brakes

b) Air lines that control the emergency brakes on combination vehicles

c) Air lines that control the emergency brakes of the tractor

Answer: b) Air lines that control the emergency brakes on combination vehicles

After the trailer has been coupled to the tractor, the tractor protection control valve should be placed in what position?

a) Down

b) Normal

c) Up

Answer: b) Normal

You supply air to the trailer tanks by

a) Pulling out the trailer air supply valve

b) Pushing in the trailer air supply valve

c) Connecting the service line glad hand

Answer: b) Pushing in the trailer air supply valve

Glad hands are used to connect the

a) Electrical lines from the tractor to the trailer

b) Service and emergency air lines from the truck or tractor to the trailer

c) Kingpin from the trailer to the locking jaws of the fifth wheel

Answer: b) Service and emergency air lines from the truck or tractor to the trailer

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

a) 10

b) 30

c) 20

Answer: a) 10

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

a) Applying and releasing the trailer brakes and listening for brake sounds

b) Turning on the parking brakes from the cab

c) Lifting the brake pedal

Answer: a) Applying and releasing the trailer brakes and listening for brake sounds

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

a) The tractor to lose all air pressure

b) The trailer supply valve to stay open

c) The tractor protection valve to close

Answer: c) The tractor protection valve to close

A trailer is most likely to jackknife when it is

a) Loaded to full capacity

b) Empty

c) Overloaded

Answer: b) Empty

The front trailer supports are up, and the trailer is resting on the tractor. Make sure that

a) The safety latch is in the unlocked position

b) There is enough clearance between the tractor frame and the landing gear

c) There is enough clearance between the upper and lower fifth wheel

Answer: b) There is enough clearance between the tractor frame and the landing gear

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; yellow

b)Blue; red

c) Red; blue

Answer: c) Red; blue

While you are driving, your emergency air line breaks or gets pulled apart. The loss of pressure will cause the

a) Trailer supply valve to open

b) Air compressor to unload instead of pumping air

c) Trailer emergency brakes to come on

Answer: c) Trailer emergency brakes to come on

Describe what the trailer air supply controls does

a) It is a device used to keep the trailer behind the tractor

b) It is used to supply the trailer with air, shut the air off, and apply the trailer emergency

c) It is a six-sided yellow knob used to control the tractor protection valve

Answer: b) It is used to supply the trailer with air, shut the air off, and apply the trailer emergency

If the brakes did not release when you pushed the trailer air supply valve, you should

a) Check the air line connections

b) Cross the air lines

c) Check the electrical cables

Answer: a) Check the air line connections

You have a major leak in the service line, and you apply the brakes. Service air pressure will escape and cause the

a) Tractor spring brakes to lock on

b) Trailer emergency brakes to come on

c) Trailer tank pressure to be lost

Answer: b) Trailer emergency brakes to come on

After connecting the air lines but before backing under the trailer, you should

a) Make sure that the trailer brakes are off

b) Supply air to the trailer system and then pull out the air supply knob

c) Walk around the rig to make sure it is clear

Answer: b) Supply air to the trailer system and then pull out the air supply knob

What is the emergency air line for?

a) To engage the front brakes of the tractor in case of an emergency

b) To engage the trailer brakes in case of air pressure loss

c) To have extra air pressure in case you need it

Answer: b) To engage the trailer brakes in case of air pressure loss

Which of the following is true about off-tracking or "cheating?"

a) The rear wheels follow the same path as the front wheels

b) If there is more than one trailer, the rear wheels of the last trailer will off-track the most

c) Longer vehicles off-track less

Answer: b) If there is more than one trailer, the rear wheels of the last trailer will off-track the most

In general, the higher your truck's center of gravity, the

a) Easier it is to turn over

b) Easier it is to turn around corners

c) More stable it is when turning

Answer: a) Easier it is to turn over

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 in its bracket

b) Raised three-quarters of the way with the crank handle removed

c) Fully raised with the crank handle secured in its bracket

Answer: c) Fully raised with the crank handle secured in its bracket

How much space should there be between the upper and lower fifth wheel after coupling?

a) About ¼ inch

b) Just enough to see light through it

c) None

Answer: c) None

Where should the tractor be when you inspect the landing gear after uncoupling the trailer?

a) Completely cleared from the trailer

b) With the fifth wheel directly beneath the kingpin

c) With the tractor frame under the trailer

Answer: c) With the tractor frame under the trailer

The hand valve should be used

a) Only with the foot brake

b) Only when the trailer is fully loaded

c) To test the trailer brakes

Answer: c) To test the trailer brakes

When should you use chocks to park a trailer not equipped with spring brakes?

a) Only when it will be parked on an incline

b) Never

c) Always

Answer: c) Always

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 pressure

b) It will keep dirt and water out of the lines

c) The connected brake circuit becomes a backup air tank

Answer: b) It will keep dirt and water out of the lines

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 is likely to happen until you try to apply the brakes

b) The trailer's air tank will exhaust through the open line

c) The emergency tractor brakes will come on

Answer: a) Nothing is likely to happen until you try to apply the brakes

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 it carefully

b) Put the tractor in gear and pull ahead with a sharp jerk

c) Rock the trailer back and forth with the trailer brakes locked

Answer: a) Pull gently forward in low gear against the locked trailer brakes; then look at it carefully

Almost half of all truck driver deaths are the result of

a) Speed

b) Following too closely

c) Rollovers

Answer: c) Rollovers

Which type of truck-trailer combination has the greatest chance of a "crack-the-whip" rollover?

a) A tractor pulling two trailers

b) A tractor pulling three trailers

c) A single tractor trailer

Answer: b) A tractor pulling three trailers

When you drive a set of doubles, which shut-off valve must be closed in the last trailer?

a) Back

b) Front

c) Middle section

Answer: a) Back

A tractor with a(n) ____ trailer requires the shortest amount of stopping distance

a)Lightly loaded

b) Empty

c) Fully loaded

Answer: c) Fully loaded

Semi-trailers made before 1975 that are equipped with air brakes

a) Are easier to brake because they are heavier

b) Often do not have spring brakes

c) Usually need a glad hand converter

Answer: b) Often do not have spring brakes

If you do not do the final air brake check for air leaks and fix them before driving,

a) Tire pressure will drop

b) You could lose your brakes while driving

c) Your fuel usage will increase

Answer: b) You could lose your brakes while driving

You should not use the trailer hand brake to straighten out a jackknifing trailer, because

a) The brake handle is too hard to reach

b) The brakes on the trailer wheels caused the skid in the first place

c) The brakes on the trailer wheels will not respond to the hand brake

Answer: b) The brakes on the trailer wheels caused the skid in the first place

When should you use chocks to park a trailer not equipped with spring brakes?

a) Low gear

b) Intermediate gear

c) High gear

Answer: a) Low gear

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

a) Nothing. Back up and lock the fifth wheel

b) The electrical service cable

c) The emergency and service air lines

Answer: c) The emergency and service air lines

Before you back under a trailer, make sure that

a)The air brakes are off

b) The air supply knob is in

c) The trailer brakes are locked

Answer: c) The trailer brakes are locked

To stop a trailer skid, you should

a) Use the trailer hand brakes

b) Counter steer

c) Release the brakes

Answer: c) Release the brakes

Trucks roll over more easily when fully loaded and are

a) Five times more likely to roll over in a crash than empty rigs

b) Ten times more likely to roll over in a crash than empty rigs

c) Two times more likely to roll over in a crash than empty rigs

Answer: b) Ten times more likely to roll over in a crash than empty rigs

Here are two things that a driver can do to prevent a rollover: Keep the cargo as close to the ground as possible, and

a) Keep the fifth wheel's free play as tight as possible

b) Go slowly around turns

c) Make sure that the brakes are properly adjusted

Answer: b) Go slowly around turns

Which of these vehicles off-tracks the most?

a) A 5-axle tractor towing a 52-foot trailer

b) A 5-axle tractor towing a 42-foot trailer

c) A 5-axle tractor towing a 45-foot trailer

Answer: a) A 5-axle tractor towing a 52-foot trailer

When connecting the glad hands, press the two seals together with the couplers at what angle to each other?

a) 45 degrees

b) 180 degrees

c) 90 degrees

Answer: c) 90 degrees

The air leakage rate for a combination vehicle (engine off, brakes on) should not be more than ___ psi per minute.

a) 2

b) 4

c) 6

Answer: b) 4

The fifth wheel locking lever is not locked after the jaws close around the kingpin. This means that

a) The coupling is not right and should be fixed before you drive the coupled unit

b) The trailer will not swivel on the fifth wheel

c) The parking lock is off and you may drive away

Answer: a) The coupling is not right and should be fixed before you drive the coupled unit

When should you use the hand valve to park a combination vehicle?

a) Never

b) To park at loading docks

c) To park on a grade

Answer: a) Never

You are uncoupling a trailer. After you shut off the trailer air supply and lock the trailer brakes, you should

a) Back up gently to ease pressure on the fifth wheel locking jaws

b) Begin to lower the trailer landing gear

c) Immediately apply your tractor parking

Answer: a) Back up gently to ease pressure on the fifth wheel locking jaws

Which part of the kingpin should the locking jaws close around?

a) The base

b) The shank

c) The head

Answer: b) The shank

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 forward

b) When you lock up the drive tires on the tractor and the tractor spins out sideways as the trailer continues to push forward

c) Neither of the above

Answer: b) When you lock up the drive tires on the tractor and the tractor spins out sideways as the trailer continues to push forward

While you check if the rear trailer is securely coupled to the front trailer, the landing gear should be

a) Slightly raised

b) Fully lowered

c) Fully raised

Answer: a) Slightly raised

When you get ready to back under the semi-trailer, you should line up

a) The kingpin to engage the driver's side locking jaw first

b) Directly in front of the trailer

c) About 12 degrees off the line of the trailer

Answer: b) Directly in front of the trailer

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 make a sudden movement of your steering wheel, cargo will tend to forcefully slide to the back of the trailer, forcing the trailer to roll over.

b) When you make a quick lane change or sudden movement of your steering wheel, the tractor tends to rock and sway. The velocity of the rearmost trailer forces the tractor to roll over before the trailer

c) When you make a quick lane change or sudden movement of your steering wheel, the rear trailer tends to swing out. The force of the rear trailer becomes amplified, causing it to roll over (rearward amplification)

Answer: c) When you make a quick lane change or sudden movement of your steering wheel, the rear trailer tends to swing out. The force of the rear trailer becomes amplified, causing it to roll over (rearward amplification)

After you lock the kingpin into the fifth wheel, you should check the connection by pulling

a) Forward 50 feet, then turning right, and then left

b) The tractor ahead sharply to release the trailer brakes

c) The tractor ahead gently with the trailer brakes locked

Answer: c) The tractor ahead gently with the trailer brakes locked

When you are uncoupling a loaded trailer, lower the landing gear until it

a) Reaches the ground

b) Makes firm contact with the ground

c) Makes contact with the ground, and leave the trailer off the fifth wheel

Answer: b) Makes firm contact with the ground

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 than 10 seconds to clear a double track

b) It takes 10 seconds to clear a single track and more than 12 seconds to clear a double track

c) It takes 14 seconds to clear a single track and more than 15 seconds to clear a double track

Answer: c) It takes 14 seconds to clear a single track and more than 15 seconds to clear a double track

You should use chocks when parking a trailer without spring brakes because

a) Some states require chocking of trailer wheels

b) You don't want the trailer rolling down a hill

c) If the air supply leaks away, there will be no brakes

Answer: c) If the air supply leaks away, there will be no brakes

The best way to tell if your trailer has started to skid is to

a) Hear the wheels skidding

b) See it in your mirrors

c) Feel for "pulling" in the cab

Answer: b) See it in your mirrors

Which of these statements is true?

a) Light vehicles need more braking power to stop than heavy ones

b) "Bobtail" tractors can take longer to stop than a combination vehicle loaded to the maximum gross weight

c) Always delay braking a heavy vehicle until you have no other choice

Answer: b) "Bobtail" tractors can take longer to stop than a combination vehicle loaded to the maximum gross weight

The best way to tell if your trailer has started to skid is to

a) See it in your mirrors

b) Feel for "pulling" in the cab

c) Hear the wheels skidding

Answer: a) See it in your mirrors

Which of these statement is true?

a) Always delay braking a heavy vehicle until you have no other choice

b) "Bobtail" tractors can take longer to stop than a combination vehicle loaded to the maximum gross weight

c) Light vehicles need more braking power to stop than heavy ones

Answer: b) "Bobtail" tractors can take longer to stop than a combination vehicle loaded to the maximum gross weight

What are the other names for the service air line?

a) Control line and signal line

b) Straight line and control line

c) Curved line and signal line

Answer: a) Control line and signal line

The tractor protection valve will close and the trailer ___ brakes will come on when there is a major leak in the brake line

a) Emergency

b) Service

c) Parking

Answer: a) Emergency

You should use chock when parking a trailer without spring brakes because

a) If the air supply leaks away, there will be no brakes

b) You don't want the trailer rolling down a hill

c) Some states require chocking of trailer wheels

Answer: a) If the air supply leaks away, there will be no brakes

To unlock the fifth wheel, pull the release handle to the ___ position

a) Neutral

b) Closed

c) Open

Answer: c) Open

When checking the trailer emergency brakes, make sure that the tractor protection control valve is placed in the ___ position

a) Normal

b) Neutral

c) Emergency

Answer: c) Emergency

When backing a tractor under a trailer, you should

a) Do it quickly to ensure that the kingpin is locked into the fifth wheel

b) Always approach the trailer at a slight angle

c) Always use the lowest reverse gear

Answer: c) Always use the lowest reverse gear

What gear should the tractor engine be in after you uncouple the trailer and are inspecting the trailer supports

a) High reverse

b) Low reverse

c) Neutral

Answer: c) Neutral

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 see vehicles coming toward you, stop and back up for them

b) You should turn wide as you complete the turn

c) You should turn wide before you start the turn

Answer: b) You should turn wide as you complete the turn

Air and electrical lines from the tractor to the trailer should be

a) Resting on the frame of the tractor

b) Secured but with enough slack for turns

c) Pulled tight with very little slack

Answer: b) Secured but with enough slack for turns

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) Red flags

b) Red lights

c) A red flag

Answer: b) Red lights

To unlock the fifth wheel, pull the release handle to the ___ position

a) Neutral

b) Open

c) Closed

Answer: b) Open

You are coupling a semi-trailer to your tractor but have not yet backed under it. The trailer is at the right height if

a) The end of the kingpin is even with the top of the fifth wheel

b) It will be raised slightly when the tractor is backed under it

c) The kingpin is about 1 1/4 inches above the fifth wheel

Answer: b) It will be raised slightly when the tractor is backed under it

When you are uncoupling a loaded trailer, lower the landing gear until it

a) Reaches the ground

b) Makes contact with the ground, and leave the trailer off the fifth wheel

c) Makes firm contact with the ground

Answer: c) Makes firm contact with the ground

When coupling, the proper position of the fifth wheel is

a) Titled down toward the end of the tractor

b) Titled up toward the end of the tractor

c) Level with the ground

Answer: a) Titled down toward the end of the tractor

The iron trailer supports are up, and the trailer is resting on the tractor. Make sure that

a) There is enough clearance between the tractor frame and the landing gear

b) The safety latch is in the unlocked position

c) There is enough clearance between the upper and lower fifth wheel

Answer: a) There is enough clearance between the tractor frame and the landing gear

When you get ready to back under the semi-trailer, you should line up

a) About 12 degrees off the line of the trailer

b) Directly in front of the trailer

c) The kingpin to engage the driver's side locking jaw first

Answer: b) Directly in front of the trailer

When should you use the hand valve to park a combination vehicle?

a) To park on a grade

b) To park at loading docks

c) Never

Answer: c) Never

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 pressed

b) The hand valve will apply the tractor brakes instead of the trailer brakes

c) If the trailer has no spring brakes, you will be able to drive away but you won't have trailer brakes

Answer: c) If the trailer has no spring brakes, you will be able to drive away but you won't have trailer brakes

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 tractor

b) The rear trailer is twice as likely to turn over as the tractor

c) Each trailer is just as likely to turn over as the tractor

Answer: b) The rear trailer is twice as likely to turn over as the tractor

When should you use chocks to park a trailer not equipped with spring brakes?

a) Never

b) Always

c) Only when it will be parked on an incline

Answer: b) Always

Why should you make sure that the fifth wheel plate is greased as required?

a) To ensure good electrical connections

b) To prevent steering problems

c) To reduce heat and noise

Answer: b) To prevent steering problems

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 forward

b) When you lock up the drive tires on the trailer and the trailer spins out sideway as the tractor continues to push forward

c) Neither of the above

Answer: a) When you lock up the drive tires on the tractor and the tractor spins out sideways as the trailer continues to push forward

What is the first step in coupling a tractor-semitrailer?

a) Check the trailer's height

b) Inspect the fifth wheel

c) Secure the tractor

d) Connect all air lines to the trailer

Answer: b) Inspect the fifth wheel

What is the best way to test the trailer service brakes?

a) Pull forward very quickly, then apply the trailer brakes with your hand control

b) Try putting the hand brake on when you are on a deserted road

c) Accelerate to the maximum speed possible in a parking lot, then apply the trailer brakes

d) Pull forward very slowly, then apply the trailer brakes with your hand control

Answer: d) Pull forward very slowly, then apply the trailer brakes with your hand control

Where would you find the shut-off valves?

a) In the front of a trailer

b) In the front of the tractor

c) In the rear of the tractor

d) In the rear of a trailer

Answer: d) In the rear of a trailer

During a walkaround inspection of a combination vehicle, you should check to make sure that

a) The kingpin is not damaged

b) All locking pins are present and locked in place

c) The landing gear is fully raised

d) All of the above are true

Answer: d) All of the above are true

Which of the following is NOT part of testing the tractor protection valve?

a) Pulling forward slowly, then applying the trailer brakes

b) Pressing the brake pedal sever times to release air

c) Charging the trailer's air brake system first

d) Shutting off the engine

Answer: a) Pulling forward slowly, then applying the trailer brakes

Which of the following is NOT part of checking that air is flowing to all trailers?

a) Going to the rear of the rig

b) Pressing the pedal several times to lower the air pressure

c) Pushing in the red "trailer air supply" knob

d) Opening the emergency line shut-off valve

Answer: b) Pressing the pedal several times to lower the air pressure

Which of the following could happen if you try to couple when the trailer is too high?

a) It might not couple correctly

b) You could damage the trailer nose

c) The tractor might strike and damage the trailer

d) The tractor could roll away

Answer: a) It might not couple correctly

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 set for a tandem-axle tractor

b) Car carriers

c) Moving vans

d) All of the above

Answer: d) All of the above

While uncoupling, what should you do AFTER you unlock the fifth wheel?

a) Lower your landing gear

b) Disconnect your air lines

c) Position your rig

d) Pull the tractor forward so that it is partially clear of the trailer

Answer: d) Pull the tractor forward so that it is partially clear of the trailer

After coupling, how much space should there be between the lower and upper fifth wheel?

a) 1 foot

b) 24-36 inches

c) None

d) 5 feet

Answer: c) None

Which of the following is NOT part of inspecting the coupling?

a) Checking that the locking lever is in the correct ("lock") position

b) Driving a few feet to test that it is connected correctly

c) Checking that there is no space between the upper and lower fifth wheel

d) Checking that the fifth wheel jaws have closed on the correct part of the kingpin

Answer: b) Driving a few feet to test that it is connected correctly

To drive, how high do you need to raise the landing gear?

a) Part of the way up

b) Exactly 6 feet off the ground

c) Only slightly off the ground so that it will be easier to use later

d) All the way up

Answer: d) All the way up

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 coming from the back of the brakes

b) It was built after March 1, 1998

c) The letters "ABS" are on the left side of the steering wheel

d) It has yellow ABS malfunction lamps

Answer: c) The letters "ABS" are on the left side of the steering wheel

To prevent a rollover while driving a combination vehicle, the two most important things are

a) Keeping cargo near the center of the vehicle and driving slowly on the highway

b) Keeping cargo near the ground and driving slowly around turns

c) Keeping cargo near the ground and driving slowly on the highway

d) Keeping cargo near the center of the vehicle and driving slowly on turns

Answer: b) Keeping cargo near the ground and driving slowly around turns

If you use the trailer hand valve while driving,

a) You might make the trailer skid

b) If might cause the vehicle to start moving too quickly

c) You might scare someone by causing a noise

d) All of the above could happen

Answer: a) You might make the trailer skid

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 begin with

b) It depends on how fast you were going to begin with. Apply the hand brake if you were speeding

c) Yes, because the hand brake will help you get out of the skid

d) Yes, because the hand brake may not stop the skid, but it will reduce the risk of a rollover

Answer: a) No, because the brakes on the trailer wheels are what caused the skid to begin with

Which of the following is NOT true about an antilock braking system (ABS)?

a) You will find it on all tractors built after March 1998

b) It only activates if your wheels are in danger of locking up

c) It is a service in addition to your normal brakes

d) It increases your normal braking ability

Answer: d) It increases your normal braking ability

Which of the following controls air in the service line?

a) The trailer had brake

b) Both the hand brake and the foot brake

c) Neither the hand brake nor the foot brake

d) The foot brake

Answer: b) Both the hand brake and the foot brake

Which of the following is the definition of "offtracking?"

a) How the rear wheels follow a different track than the front wheels in a turn

b) Stopping for too long on breaks and getting "off the track" of your original schedule

c) What happens when both the front wheels and the rear wheels leave the roadway in an accident

d) How the rear wheels are more likely to leave the roadside or "track"

Answer: a) How the rear wheels follow a different track than the front wheels in a turn

Which of the following is NOT a purpose of the emergency air line?

a) To control a combination vehicle's emergency brakes

b) To supply air to the trailer's air tanks

c) To cause the trailer emergency brakes to be applied if the emergency air line loses pressure

d) To supply air to relay valves that help the foot brake operate more quickly

Answer: d) To supply air to relay valves that help the foot brake operate more quickly

What does the trailer air supply control do?

a) By pushing it in, you supply the tires with air

b) By pushing it in, you supply the trailer with air

c) By pulling it out, you remove air from overinflated tires

d) By pulling it out, you supply the trailer with air

Answer: b) By pushing it in, you supply the trailer with air

When parking a vehicle that does not have spring brakes, you should use chocks

a) To keep the trailer from offtracking so much

b) To stop the trailer from jackknifing

c) To help the trailer go more quickly

d) To keep the trailer from moving

Answer: d) To keep the trailer from moving

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 backing

b) Use your mirrors on both sides

c) First, check your path carefully, by getting out and walking around the vehicle

d) Do all of the above

Answer: d) Do all of the above

When you check the lower fifth wheel, you do NOT need to check

a) That there are no missing parts

b) That you cannot see any space between the upper and lower fifth wheels

c) That the shut-off valves completely closed

d) Whether it has enough grease

Answer: c) That the shut-off valves completely closed

Which of the following is most likely to roll over?

a) The rear trailer of a triple

b) The middle trailer of a triple

c) The rear trailer of a double

d) The front trailer of a double

Answer: a) The rear trailer of a triple

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 fully

The air brake endorsement:

Answer: Must be present when using a vehicle with air brakes

Pressing and releasing the brake pedal unnecessarily can:

Answer: Let air out faster than it can be replaced

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 primary and secondary systems

What were front brake limiting valves used for?

Answer: To prevent skidding by the front tires

Pressing and releasing the brake pedal unnecessarily can

Answer: Let air out faster than it can be replaced

What does the air compressor governor do?

Answer: Controls when the air compressor pumps air into the air storage tanks

The brake pedal is part of which braking system?

Answer: Service brake system

Where are ABS malfunction lamps located?

Answer: on the instrumental panel

Truck tractors with air brakes built after March 1, 1997 must have:

Answer: Antilock braking system

What must be on all air tanks with air -braked vehicles?

Answer: a check valve

What part of the truck is the air compressor connected to?

Answer: Engine

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.

Answer: 100

What kind of force must emergency brakes use?

Answer: Mechanical

With brake drums, what happens if brakes become too hot?

Answer: the brakes may stop working

If the air pressure warning light comes on, you should:

Answer: Safely exit the roadway and stop

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 primary and secondary systems

A dual air brake system:

Answer: Has two separate air brake systems which use a single set of controls

Why do some air brake systems use alcohol?

Answer: To reduce the risk of ice in air brake valves during cold weather

When do the spring brakes come on?

Answer: When main air pressure is lost

The air storage tanks:

Answer: Hold enough air so the brakes could be used several times if the compressor stops working

When the brake pedal is pushed down, air brakes work:

Answer: After a short delay

What can happen if the parking brakes are used in very wet weather?

Answer: The brakes may freeze so the vehicle cannot move

The safety valve located on the first tank opens:

Answer: If there is too much pressure

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.

Answer: 5

What factors can cause brakes to fade or fail?

Answer: Overheating, low air pressure and not relying on the engine braking effect

The parking or emergency brakes of trucks or buses can legally be held on by _____ pressure.

Answer: spring

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: 60

How do brakes work on a long, steep downgrade?

Answer: As a supplement to the braking effect of your engine

The safety valve is set to automatically reduce pressure at __ psi.

Answer: 150

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 feet

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 the ABS repaired soon

Generally, why must you take an exam about air brakes?

Answer: Otherwise, you will have to get a CDL with restrictions

The maximum leakage rates per minute after the initial drop are

Answer: 3 psi for single vehicle and 4psi for a combination vehicles

Which conditions are front wheel brakes good under?

Answer: All weather conditions

Which of the following is NOT part of the air-brake system?

Answer: Radio signal system

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 air pressure below 60psi

How can you tell if your vehicle is equipped with an anti-lock braking system?

Answer: if the vehicle is manufactured after 1998

The purpose of a supply pressure gauge is

Answer: to tell you how much air is in the tank

Which of the following is a reason that air tanks must be drained?

Answer: your brakes may fail due to the water freezing

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 quickly so that you will be able to keep the trailer and tractor straight

When should you use the parking brake?

Answer: overtime you leave your vehicle, with rare exceptions

Which vehicles must have low air pressure warning signals?

Answer: All vehicles with air brakes currently in operation must have low air pressure warning signals

When should you drain your air tanks?

Answer: At the end of each working day

Which of the following is NOT part of the drum brake?

Answer: Safety valve

How would you check your truck's slack adjusters?

Answer: Use gloves and pull hard on each slack adjuster you can reach

Which of the following does ABS do?

Answer: Activates when the wheels are bout to lock up

At what measurement is the safety valve USUALLY set to open?

Answer: 150 psi

If you must make an emergency stop, brake so you:

Answer: can steer and your vehicle stays in a straight line

All air brakes equipped vehicles have:

Answer: a supply pressure gauge

The application pressure gauge shows how much air pressure you:

Answer: are applying to the brakes

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 used add 1psi}

For long downhill grades, experts recommend light steady pressure on pedal instead of repeated braking, why?

Answer: Air usage is less preventing over heating while driving in lower gear

The only part of the S-cam brake that does not move is:

Answer: the "S" cam

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 until you fix it

While driving, the low air pressure indicator turns on, how do you alert other drivers of the problem?

Answer: Using your Brakes

The hand brake of heavy vehicles are of distinct colors and shapes:

Answer: Yellow Dimond (Tractor)- Red Octagon ( Trailer)

The hand brake is used to:

Answer: Release and apply brakes

 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 or being used add 1psi}

The spring brakes or emergency brakes pop when air pressure in the tank is about

Answer: 20-40psi

When air pressure reaches 100 psi, what happens in the tank?

Answer: the compressor turn on

The safety relief valve in an air system opens when the compressor fails to cut off and pressure in the tank reaches:

Answer: 150 psi

The red warning lights turns on in an air system when you are losing pressure and it reaches:

Answer: 60psi

The air brake system is fully loaded at :

Answer: 125 psi

Cracks in disc brakes should not be more than:

Answer: 1/2 of the width of the area of friction

On a long steep hill, air brakes are supplemented by:

Answer: Engine retarders

When moving downhill, at what speed do you release the brake?

Answer: 5mph

On a highway, how many seconds of separation should there be between one vehicle and another:

Answer: 10

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 moves

Slack adjusters need to be adjusted if after pulling with hand they move more than:

Answer: 1 inch

What is normal pressure in an air system indicating vehicle is good to drive?

Answer: 90-120 psi

The modulating control valves are used to:

Answer: slowly apply the spring brakes

The manual valve of the trailer (Johnson) should not be used to:

Answer: parked the vehicle

The manual valve of the trailer is used to

Answer: test the trailer brakes

The excessive use of the service brake can result in:

Answer: Over heating of brakes leading to brake fading or brake failure

Under normal conditions, to apply the hand brake, the driver must first:

Answer: Release air from the air system

For an average driver, good traction and good brakes, the total stopping distance is:

Answer: More than 300ft

When the spring brakes are applied, you should not:

Answer: Push down on brake pedal

How many pounds of pressure must be built by the compressor in a double air system before driving?

Answer: 100 psi

The compressor in an air system shuts off when the air supply reaches:

Answer: 125 psi

Brake lights are activated by:

Answer: Electrical switch which is activated by the air pressure on the brake pedal

The time it takes the air brakes to work at 55MPH on dry pavement is:

Answer: 32ft while braking

The proper procedure for inspecting air tanks for oil contamination is:

Answer: Open the tank petcock and allow tanks to drain

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 drive

How does the service brake work to stop the vehicle?

Answer: The brake shoes and linings are pushed against the inside of the drum

When the engine is at operating RPM, the pressure should build from 85 to 100 psi in:

Answer: 45 seconds

Which of the following makes total stopping distance longer for air brakes than hydraulic brakes?

Answer: Brake lag

You know your brakes are fading when you feel that:

Answer: You have to push harder on the brake pedal to control your speed downgrade

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 possible

Use the parking brakes:

Answer: Any time when parking. except when brakes are very hot or wet in freezing temperatures.

Air braking takes more time than hydraulic braking because air brakes:

Answer: Need to have air flow through the lines to work

To test service brakes you should brake firmly when moving slowly forward. The brakes are OK if you notice what?

Answer: Vehicle stops well

If you make an emergency stop, how should you brake?

Answer: You brake so you can steer and your vehicle stays in a straight line

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 are applied or being used, add 1 PSI)

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 are applied or being used, add 1)

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 a safe stop and continue only when system is fixed

To check for free play in a manual slack adjuster, you need:

Answer: Park on level ground, chock the wheels and release parking brakes

In air brake vehicles, the parking brakes should be used how?

Answer: Any time the vehicle is parked

The braking power of the spring brakes:

Answer: Depends on the adjustment of the service brakes

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 parking brakes to move a short distance

Front brake limiting valves are used to:

Answer: Reduce the chance of front wheel skids

What does the application pressure gauge shows you?

Answer: It shows how much air pressure you are applying to the brakes

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 pressure

During Normal driving, parking and emergency brakes are usually held back by?

Answer: Air pressure

The driver must be able to see a warning light that is given when air pressure in the service tanks falls bellow:

Answer: 60 PSI

Vehicle with air brakes must have:

Answer: An air pressure gauge to show the pressure available for braking

Why drain water from compressed air tanks?

Answer: Water can freeze in cold weather and cause brake failure

If your vehicle has an alcohol evaporator, everyday during cold weather what should you do?

Answer: Check and fill the alcohol level

The brake pedal in an air brake system:

Answer: Controls the air pressure applied to put on brakes

If your vehicle has an alcohol evaporator, why is it there?

Answer: To reduce the risk of ice in air brake valves in cold weather

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 day

What does the air compressor governor do?

Answer: It controls when air is pumped into the air tanks

Modern air brake systems combine three different systems. They are the service brakes, the parking brakes and the :

Answer: Emergency brake

When your vehicle is empty, start braking:

Answer: Sooner than when loaded

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 get the ABS repaired soon

Which vehicles must have low air pressure warning signals?

Answer: All vehicles with air brakes currently in operation must have low air pressure warning signals

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 air pressure below 60 psi

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 quickly so that you will be able to keep the trailer and tractor straight

At what measurement is the safety valve USUALLY set to open?

Answer: 150 psi

The tractor protection valve.

Answer: Provides the air supply for the brake system, Is closed by the parking brakes, Will close itself automatically if the air supply drops to a certain level

The maximum leakage rates per minute after the initial drop are.

Answer: 3 psi for single vehicles and 4 psi for combination vehicles

Which of the following is NOT part of the drum brake?

Answer: Safety valve

Which of the following is a reason that air tanks must be drained?

Answer: Your brakes may fail due to the water freezing

Which of the following should you do before leaving your vehicle unattended?

Answer: Chock the wheels, Put on the parking brakes, Remove the keys

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 relying enough on engine braking

Which conditions are front wheel brakes good under?

Answer: All weather conditions

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 the brake pedal until the parking brake valve pops out, continue to step on and off the brake pedal until the manufacture's low psi specification has been met for spring brakes to deploy, on single vehicles, continue to step on and off the brake pedal until the parking brake valve pops out

How would you check your truck's slack adjusters?

Answer: Use gloves and hard on each slack adjusters you can reach

Which of the following is NOT part of the air-brake system?

Answer: Radio signal system

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 the push rod and S-cam on drum brakes