Truck Test 3

1.What keeps the air in the tanks if the air compressor develops a leak?

The air compressor

The emergency relay switch

The emergency relay valve

The one way check valve

Correct! Wrong!

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Truck Test 3

2.The distance the ______ of the foot valve is depressed by the driver determines the air pressure that will be applied in order to operate the brakes.

Treadle

Brake chamber

Slack adjuster

Diaphragm

Correct! Wrong!

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Truck Test 3

3.A foot valve ______________.

Creates the friction required to stop the wheels

Stores the compressed air

Transfers the force exerted by the compressed air to mechanical linkages

Regulates the flow of compressed air from the reservoir when it is needed for braking

Correct! Wrong!

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Truck Test 3

4.If compressed air of 120 psi acts on a diaphragm of 45 square inches, how much force is produce?

3,600 psi

5,400 psi

75 psi

164 psi

Correct! Wrong!

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Truck Test 3

5.Which of the following is a circular container divided in the middle by a flexible diaphragm?

Locking collar

A brake chamber

Push rod

Slack adjuster

Correct! Wrong!

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Truck Test 3

6.Levers and air pressure give brakes:

More compression

Grey

A mechanical advantage

Mechanical energy

Correct! Wrong!

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Truck Test 3

7.Most brake linings work best around:

250° C

425° C

300° C

1100° C

Correct! Wrong!

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Truck Test 3

8.To stop a vehicle in 1/10 the time it took to accelerate would require a stopping force of __ times the acceleration force.

2

20

10

5

Correct! Wrong!

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Truck Test 3

9.The time it takes from the moment a hazard is recognized to the time the brake is applied is known as:

Braking distance

Brake lag

Driver's reaction time

Stopping distance

Correct! Wrong!

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Truck Test 3

10.All compressor reservoirs must be drained ______, in order to avoid excess water collection.

Daily

Biweekly

Weekly

Monthly

Correct! Wrong!

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Truck Test 3

11.A manual front brake limiting valve is useful in what type of conditions?

Narrow roads

Inclines

Slippery road surface

Heavy traffic

Correct! Wrong!

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Truck Test 3

12.Which of the following uses air pressure to assist brake force but does not require an air brake endorsement on your licence in order to operate?

Air-actuated hydraulic brake system

Wedge brakes

Air-boost hydraulic brake system

Disc brakes

Correct! Wrong!

Progress
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Truck Test 3

13.What component of an air brake system prevents air from moving backwards in the system toward the compressor?

Relay valve

Quick release valve

One-way check valve

Air pressure gauge

Correct! Wrong!

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Truck Test 3

14.The braking force required to stop a vehicle varies directly with its _______________.

Energy and friction

Weight and energy

Weight and speed

Speed and friction

Correct! Wrong!

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Truck Test 3

15.What part can be installed on long wheel base vehicles to allow the brakes to release quickly and fully by discharging the application air near the brake chambers?

Relay valve

Quick release valve

Manual front brake limiting valve

One-way check valve

Correct! Wrong!

Progress
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Truck Test 3

16.The compressor must be able to build reservoir air pressure from _______ within three minutes, otherwise the compressor requires servicing.

50 to 90 psi

90 to 20 psi

40 to 100 psi

Correct! Wrong!

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Truck Test 3

17.What is the cause of accumulated sludge at the bottom of a reservoir?

Oil leaking past the piston rings

Cold weather

Faulty wiring

Condensation from heated air cooling

Correct! Wrong!

Progress
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Truck Test 3

18.When the driver releases the foot valve treadle and the air in the brake chambers is allowed to exhaust through the ______, releasing the brakes.

Compressor

Governor

Foot valve

Wet reservoir

Correct! Wrong!

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Truck Test 3

19.If an air brake system's compressor is struggling to build 90 psi of air pressure within 3 minutes, which of the following is most likely the problem?

Air filter is plugged

Bad inlet valve

Motor overload

Scored cylinder

Correct! Wrong!

Progress
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Truck Test 3

20.Braking at highway speed causes brake drum ___ due to heat, which in turn requires _ push rod travel to maintain the same braking force.

Expansion, less

Expansion, greater

Contraction, greater

Contraction, less

Correct! Wrong!

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Truck Test 3

21.A reservoir's safety valve is normally set at ______.

150 psi

100 psi

50 psi

75 psi

Correct! Wrong!

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Truck Test 3

22.What type of brake assembly uses a 'power screw'?

Air brake system

Wedge brakes

Disc brakes

Air-over-hydraulic brake system

Correct! Wrong!

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Truck Test 3

23.Which of the following can result in a brake system's automatic slack adjuster not maintaining proper slack?

All of the below

Improper installation

Worn cam bushings

Bent push rods

Correct! Wrong!

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Truck Test 3

24.When a manual front brake limiting valve is activated, when applying air pressure to the front brakes it is reduced to __ percent of the application air pressure being delivered to the rear brake chambers.

25

75

10

50

Correct! Wrong!

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Truck Test 3

25.Which of the following controls the minimum and maximum air pressure in the air brake system by controlling when the compressor pumps air?

Governor

Foot valve

Brake chamber

Brake rotors

Correct! Wrong!

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Truck Test 3

26.A spring parking brake system can also act as ____________.

Emergency brakes

Standard air brakes

None of the above

Brake limiting valve

Correct! Wrong!

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Truck Test 3

27.In a spring parking brake system, the brakes are applied by _ pressure and retracted by __ pressure.

Spring, disc

Spring, air

Air, spring

Disc, spring

Correct! Wrong!

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Truck Test 3

28.The first reservoir after the compressor is known as the __________.

Secondary reservoir

Supply or wet reservoir

Primary reservoir

Dry reservoir

Correct! Wrong!

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Truck Test 3

29.Brake chambers and slack adjusters ______________________.

Transfer the force exerted by the compressed air to mechanical linkages

Create the friction required to stop the wheels

Regulate the flow of compressed air from the reservoir when it is needed for braking

Store the compressed air

Correct! Wrong!

Progress
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Truck Test 3

30.The foot valve is usually located closer to the __. The longer the distance from the foot valve to the rear chambers, the time it will take before the rear brakes apply.

Front wheels, less

Front wheels, more

Rear wheels, less

Rear wheels, more

Correct! Wrong!

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Truck Test 3

31.The force that resists movement between two surfaces in contact with each other:

Traction

Mechanical energy

Heat energy

Friction

Correct! Wrong!

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Truck Test 3

32.When a brake diaphragm chamber bottoms out, the force reduces to ____.

10

0

20

30

Correct! Wrong!

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Truck Test 3

33.When connecting the glad hands, start with the two gaskets together and the couplers at a ___ angle to each other.

45°

180°

120°

90°

Correct! Wrong!

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Truck Test 3

34.What are the two types of trailer supply valves? Choose the best answer.

Push/pull type and automatic

Automatic and spring loaded

Toggle-type switch and manual

Automatic and manual

Correct! Wrong!

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Truck Test 3

35.In regards to a dual air brake system, air taken from primary and secondary circuits through a two-way check valve is known as _________.

Dual air

Tertiary air

Blended air

Coalesced air

Correct! Wrong!

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Truck Test 3

36.Which of the following negatively affects braking ability?

Malfunctioning valves

All of these

Oversized drums

Contaminated brake linings

Correct! Wrong!

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Truck Test 3

37.The effectiveness of diaphragm brake chambers drops off significantly if the stroke exceeds __% of its designed travel.

90

50

33

75

Correct! Wrong!

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Truck Test 3

38.Which of the following is capable of directing air flow into a common line from either of the foot valve or the hand valve?

Tractor protection valve

Two-way check valve

One-way check valve

Reservoir safety valve

Correct! Wrong!

Progress
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Truck Test 3

39.On vehicles equipped with brakes it is possible to pump the brake pedal to compensate for brakes that are out of adjustment. This is not possible with a vehicle equipped with _____ brakes.

Air, disc

Disc, hydraulic

Hydraulic, air

Air, hydraulic

Correct! Wrong!

Progress
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Truck Test 3

40.___________ prevents total loss of air from the tractor if the trailer breaks away, or if the connecting airlines between tractor and trailer become separated or ruptured.

A reservoir safety valve

Emergency brakes

A two-way check valve

A tractor protection system

Correct! Wrong!

Progress
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Truck Test 3

41.Which of the following is true in the case that there is air loss in one of the dual air brake system's circuits?

Spring breaks will be applied automatically

Trailer will continue having braking ability

The pressure in the trailer reservoirs and lines will drain off

Trailer will lose all braking ability

Correct! Wrong!

Progress
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Truck Test 3

42._ must not be used to hold a parked vehicle that is left unattended. Loss of pressure will result in loss of brakes. Always set the .

Parking breaks, trailer breaks

Trailer brakes, emergency brakes

Trailer brakes, parking brakes

Emergency brakes, trailer breaks

Correct! Wrong!

Progress
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Truck Test 3

43.$What would happen if a trailer that is not equipped with spring parking brakes were to separate from the tractor?

The trailer brakes will automatically be placed into emergency application

No action will take place until the trailer supply valve is shifted to the emergency position manually to seal off the tractor

No action will take place until a brake application is made

Pressure will build up in the trailer reservoir to the same pressure as the reservoirs on the tractor.

Correct! Wrong!

Progress
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Truck Test 3

44.If a relay emergency valve is mounted on the trailer reservoir and a loss of air pressure from the power unit service system occurs, what will automatically happen?

It has no automatic function

A quick release of the trailer brakes

Emergency application of the brakes

Correct! Wrong!

Progress
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Truck Test 3

45.Which of the following is another term for a control (service) line?

Glad hands

Tractor protection valve

Supply line

Application line

Correct! Wrong!

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Truck Test 3

1.What keeps the air in the tanks if the air compressor develops a leak?

Progress 01/45

Truck Test 3

2.The distance the ______ of the foot valve is depressed by the driver determines the air pressure that will be applied in order to operate the brakes.

Progress 02/45

Truck Test 3

3.A foot valve ______________.

Progress 03/45

Truck Test 3

4.If compressed air of 120 psi acts on a diaphragm of 45 square inches, how much force is produce?

Progress 04/45

Truck Test 3

5.Which of the following is a circular container divided in the middle by a flexible diaphragm?

Progress 05/45

Truck Test 3

6.Levers and air pressure give brakes:

Progress 06/45

Truck Test 3

7.Most brake linings work best around:

Progress 07/45

Truck Test 3

8.To stop a vehicle in 1/10 the time it took to accelerate would require a stopping force of __ times the acceleration force.

Progress 08/45

Truck Test 3

9.The time it takes from the moment a hazard is recognized to the time the brake is applied is known as:

Progress 09/45

Truck Test 3

10.All compressor reservoirs must be drained ______, in order to avoid excess water collection.

Progress 010/45

Truck Test 3

11.A manual front brake limiting valve is useful in what type of conditions?

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Truck Test 3

12.Which of the following uses air pressure to assist brake force but does not require an air brake endorsement on your licence in order to operate?

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Truck Test 3

13.What component of an air brake system prevents air from moving backwards in the system toward the compressor?

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Truck Test 3

14.The braking force required to stop a vehicle varies directly with its _______________.

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Truck Test 3

15.What part can be installed on long wheel base vehicles to allow the brakes to release quickly and fully by discharging the application air near the brake chambers?

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Truck Test 3

16.The compressor must be able to build reservoir air pressure from _______ within three minutes, otherwise the compressor requires servicing.

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Truck Test 3

17.What is the cause of accumulated sludge at the bottom of a reservoir?

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Truck Test 3

18.When the driver releases the foot valve treadle and the air in the brake chambers is allowed to exhaust through the ______, releasing the brakes.

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Truck Test 3

19.If an air brake system's compressor is struggling to build 90 psi of air pressure within 3 minutes, which of the following is most likely the problem?

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Truck Test 3

20.Braking at highway speed causes brake drum _______ due to heat, which in turn requires _____ push rod travel to maintain the same braking force.

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Truck Test 3

21.A reservoir's safety valve is normally set at ______.

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Truck Test 3

22.What type of brake assembly uses a 'power screw'?

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Truck Test 3

23.Which of the following can result in a brake system's automatic slack adjuster not maintaining proper slack?

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Truck Test 3

24.When a manual front brake limiting valve is activated, when applying air pressure to the front brakes it is reduced to __ percent of the application air pressure being delivered to the rear brake chambers.

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Truck Test 3

25.Which of the following controls the minimum and maximum air pressure in the air brake system by controlling when the compressor pumps air?

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Truck Test 3

26.A spring parking brake system can also act as ____________.

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20.Braking at highway speed causes brake drum ___ due to heat, which in turn requires _ push rod travel to maintain the same braking force.

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27.In a spring parking brake system, the brakes are applied by _ pressure and retracted by __ pressure.

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30.The foot valve is usually located closer to the __. The longer the distance from the foot valve to the rear chambers, the time it will take before the rear brakes apply.

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39.On vehicles equipped with brakes it is possible to pump the brake pedal to compensate for brakes that are out of adjustment. This is not possible with a vehicle equipped with _____ brakes.

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42._ must not be used to hold a parked vehicle that is left unattended. Loss of pressure will result in loss of brakes. Always set the .

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