Truck Test 4

1.An ABS system keeps the wheel from skidding and increases vehicle stability and control during what type of conditions?

Emergency stops

Wet roads

Through curves

All of the below

Correct! Wrong!

Progress
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Truck Test 4

2.If the air pressure drops to a range between ______ psi, the trailer supply valve will close automatically by spring pressure, opening the exhaust port.

60 and 40

45 and 20

50 and 30

70 and 50

Correct! Wrong!

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Truck Test 4

3.With automatic traction control, __________ is activated when the system detects a wheel slipping because the wheels operating on different surfaces such as one wheel on dry pavement and the other on the ice.

Differential braking

Anti-lock brake system

Electronic engine control

Dual air brake system

Correct! Wrong!

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Truck Test 4

4.Which of the following is responsible for preventing automatic spring brake application if the trailer supply line has a gradual leak?

Rear service reservoir

Relay valve

Spring parking brake chambers

Trailer spring parking brake valve

Correct! Wrong!

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Truck Test 4

5.Which of the following is a term that refers to the coupling device used to connect the control (service) and supply (emergency) lines of the trailer to the tractor?

Application line

Tractor protection valve

Glad hands

Two-way check valve

Correct! Wrong!

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Truck Test 4

6.Which of the following can a tractor with a dual air brake and spring parking brakes system tow?

A tractor with a basic air brake system and spring parking brakes

A tractor with a basic air brake system and without spring parking brakes

Tractors and trailers are interchangeable regardless of air brake system or spring parking brake installation

A tractor with a dual air brake system and without spring parking brakes

Correct! Wrong!

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Truck Test 4

7.A tractor protection valve is normally located near the _________.

Front of the tractor cab

Control (service line)

Tractor protection valve

Rear of the tractor cab

Correct! Wrong!

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Truck Test 4

8.What system reduces the potential of powering into a jackknife caused by wheel overspin during acceleration?

Automatic traction control

An anti-lock brake system

Dual air brake system

Electronic engine control

Correct! Wrong!

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Truck Test 4

9.Caging a spring parking brake is the same as...

Servicing them

Mechanically releasing them

Applying them

Placing them inside metal bars

Correct! Wrong!

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Truck Test 4

10.Which of the following negatively affect braking ability?

If the diaphragm brake chambers drops off significantly if the stroke is just below 75% of its designed travel.

Brand new linings

If the angle between the slack adjuster arm and the push rod are at 90°

Excessive moisture in reservoirs

Correct! Wrong!

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Truck Test 4

11.Which of the following is a disadvantage of a control (service) line and foot and hand valve system?

If the trailer broke away from the tractor, the trailer would not have brakes.

If the air pressure in the reservoirs were lost, there would be no way to apply the brakes of the tractor or the trailer.

All of these

The application and release of the trailer brakes is slower than those of the tractor.

Correct! Wrong!

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Truck Test 4

12.A/n _______ is an electronic system that monitors wheel speed at all times and controls wheel speed while braking

Electronic engine control

An anti-lock brake system

Automatic traction control

Modulator valve

Correct! Wrong!

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Truck Test 4

13.Tractors and trailers _______ ABS can be connected to one another without affecting the operation of the ABS.

With or without

Only with the same type of

With

Without

Correct! Wrong!

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Truck Test 4

14.If the foot valve is supplying a higher application pressure than the hand valve, a two-way check valve will allow air flow from which source?

Both equally

Hand valve

Neither

Foot valve

Correct! Wrong!

Progress
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Truck Test 4

15.On the pre-trip air brake inspection, you must ensure that the parking brake spring is not _______ or it will not expand and apply the brake.

Overheated

Released

Manually caged

Exhausted

Correct! Wrong!

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Truck Test 4

16.Which of the following is true of a basic dual air brake system?

More reservoir capacity

Two brake systems in one

All of these

Safer than a basic air brake system

Correct! Wrong!

Progress
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Truck Test 4

17.One gram is equal to how many ounces?

0.035

0.50

1.0

2.2

Correct! Wrong!

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Truck Test 4

18.What should be done to parked trailers without spring parking brakes to prevent a possible runaway?

Block wheels

Apply emergency break

Park on a decline

Exhaust the supply line

Correct! Wrong!

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Truck Test 4

19.What protects the wet reservoir from becoming over pressurized?

Treadle

Governor

Foot valve

Safety valve

Correct! Wrong!

Progress
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Truck Test 4

20.In an air-boost hydraulic brake system what is used to intensify the hydraulic pressure generated by the master cylinder?

Air pressure

Vacuum

Power screw

Wedge

Correct! Wrong!

Progress
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Truck Test 4

21.When inspecting brake adjustment on a single unit, the slack (pushrod travel) should be within how many inches within the manufacturer's specifications?

½ - 1¾

¾ - 1½

1 - 2½

1½ - 2

Correct! Wrong!

Progress
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Truck Test 4

22.One metre is equal to how many yards?

5.50

0.50

1.09

2.09

Correct! Wrong!

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Truck Test 4

23.At the first stop after adjusting the wedge type brakes, check each brake drum or rotor for temperature. An extra ___ brake drum indicates that you have _ adjusted it.

Hot, under

Hot, over

Cold over

Cold, under

Correct! Wrong!

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Truck Test 4

24.What is the upward motion of the piston that compresses the air in the cylinder known as?

Cylinder stoke

Intake stoke

Loading stoke

Compression stoke

Correct! Wrong!

Progress
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Truck Test 4

25.What would be the psi if 50 pounds were being forced onto 2 square inches?

52

25

100

48

Correct! Wrong!

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Truck Test 4

26.Choose the correct order of steps to secure a vehicle as part of a single unit pre-trip air brake inspection.

Check that the compressor is secure; check the drive belt and pulleys for wear, cracking, slippage and tension; set the spring parking brake on the vehicle; block the wheels

Set the spring parking brake on the vehicle; block the wheels; check that the compressor is secure; check the drive belt and pulleys for wear, cracking, slippage and tension

Block the wheels; check that the compressor is secure; check the drive belt and pulleys for wear, cracking, slippage and tension; set the spring parking brake on the vehicle

Check the drive belt and pulleys for wear, cracking, slippage and tension; set the spring parking brake on the vehicle; block the wheels; check that the compressor is secure

Correct! Wrong!

Progress
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Truck Test 4

27.What is used to mark where the push rod enters the brake chamber when determining whether an S-cam brake with manual slack adjusters requires adjustment?

Grease

Marker

Chalk

Crayon

Correct! Wrong!

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Truck Test 4

28.How often do automatic slack adjusters need to?

Weekly

Every other day

Monthly

Daily

Correct! Wrong!

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Truck Test 4

29.Which of the following vehicles would require checking the hydraulic fluid level in the reservoir as part of the pre-trip check?

Combination with air actuated brake system

Single with dual brake system

Single with a basic air brake system

Combination with a dual brake system

Correct! Wrong!

Progress
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Truck Test 4

30.For a combination unit, during what part of the pre-trip check do you ensure that the air brake glad hands and trailer electrical cord is connected properly?

Brake test

Vehicle securement

Tractor and trailer emergency system check

Compressor and warning devices check

Correct! Wrong!

Progress
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Truck Test 4

31.After a long mountain drive, what is the best way to park if your vehicle has spring parking brakes?

Apply spring breaks like usual

Make sure wheels are turned toward the curb

Make a service brake application

Leave the transmission in the lowest gear and block the wheels

Correct! Wrong!

Progress
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Truck Test 4

32.Which of the following does not usually have a pressure gauge?

Dry reservoir

Primary reservoir

Wet reservoir

Secondary reservoir

Correct! Wrong!

Progress
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Truck Test 4

33.When conducting a compressor and warning device check for a single unit, warning device(s) must operate to __ psi or higher

55

75

25

100

Correct! Wrong!

Progress
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Truck Test 4

34.During the '_______' stage, the compressor is able to cool.

Intake stoke

Unloading

Loading

Compression stoke

Correct! Wrong!

Progress
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Truck Test 4

35.If an air-actuated hydraulic brake system was to lose its air supply, the vehicle would have no service brakes. Only the __________ would be operating.

Parking brake

Compressor

Air lines

Reservoir

Correct! Wrong!

Progress
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Truck Test 4

36.For a combination unit, during what part of the pre-trip check do you ensure that the reservoir air pressure builds from 50 to 90 psi within three minutes?

Brake adjustment

Tractor and trailer emergency system check

Vehicle securement

Compressor and warning devices check

Correct! Wrong!

Progress
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Truck Test 4

37.Discounting self-lubricated compressors, how are compressors usually lubricated?

From the brake fluid

Does not need lubrication

From grease application

From the engine lubrication system

Correct! Wrong!

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Truck Test 4

38.Can the trailer brake hand valve be used for parking?

None of the above

Only to hold a parked vehicle

Always

Never

Correct! Wrong!

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Truck Test 4

39.Choose the correct order of steps for the compressor and warning devices check as part of a single unit pre-trip air brake inspection.

Start the engine and run at fast idle to build air pressure; check that warning device(s) must operate to 55 psi or higher; ensure reservoir air pressure builds from 50 to 90 psi within three minutes; release the spring parking brake at 90 psi or above to prevent compounding the brake pressure

Check that warning device(s) must operate to 55 psi or higher; ensure reservoir air pressure builds from 50 to 90 psi within three minutes; release the spring parking brake at 90 psi or above to prevent compounding the brake pressure; start the engine and run at fast idle to build air pressure

Release the spring parking brake at 90 psi or above to prevent compounding the brake pressure; start the engine and run at fast idle to build air pressure; check that warning device(s) must operate to 55 psi or higher; ensure reservoir air pressure builds from 50 to 90 psi within three minutes

Ensure reservoir air pressure builds from 50 to 90 psi within three minutes; release the spring parking brake at 90 psi or above to prevent compounding the brake pressure; start the engine and run at fast idle to build air pressure; check that warning device(s) must operate to 55 psi or higher

Correct! Wrong!

Progress
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Truck Test 4

40.One kilogram is equal to how many pounds?

10

1.5

4.0

2.2

Correct! Wrong!

Progress
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Truck Test 4

41.An air dryer may be installed between the and the to help remove moisture from the compressed air.

Control port, wet reservoir

Compressor, wet reservoir

Wet reservoir, governor

Governor, compressor

Correct! Wrong!

Progress
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Truck Test 4

42.What does the acronym psi stand for?

Pressure per stopping inch

Pressure per square inch

Pounds per stopping inch

Pounds per square inch

Correct! Wrong!

Progress
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Truck Test 4

43.If a brake is out of adjustment and there is not enough reserve stroke of the push rod travel to compensate for drum expansion, this will cause ________.

Brake fade

Excessive moisture in reservoirs

Seized brake camshafts

Complete brake loss

Correct! Wrong!

Progress
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Truck Test 4

44.When checking for reservoir air leakage for a single unit, after making a full brake application with the foot valve and holding it the air pressure gauge reading should not drop more than __ psi per minute.

4

5

6

3

Correct! Wrong!

Progress
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Truck Test 4

45.In a dual air brake system, if one circuit develops a leak, the other circuit would be protected from air pressure loss by the __________________.

Front brake chamber

Foot valve

Two-way check valve

Primary reservoir

Correct! Wrong!

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Truck Test 4

1.An ABS system keeps the wheel from skidding and increases vehicle stability and control during what type of conditions?

Progress 01/45

Truck Test 4

2.If the air pressure drops to a range between ______ psi, the trailer supply valve will close automatically by spring pressure, opening the exhaust port.

Progress 02/45

Truck Test 4

3.With automatic traction control, __________ is activated when the system detects a wheel slipping because the wheels operating on different surfaces such as one wheel on dry pavement and the other on the ice.

Progress 03/45

Truck Test 4

4.Which of the following is responsible for preventing automatic spring brake application if the trailer supply line has a gradual leak?

Progress 04/45

Truck Test 4

5.Which of the following is a term that refers to the coupling device used to connect the control (service) and supply (emergency) lines of the trailer to the tractor?

Progress 05/45

Truck Test 4

6.Which of the following can a tractor with a dual air brake and spring parking brakes system tow?

Progress 06/45

Truck Test 4

7.A tractor protection valve is normally located near the _________.

Progress 07/45

Truck Test 4

8.What system reduces the potential of powering into a jackknife caused by wheel overspin during acceleration?

Progress 08/45

Truck Test 4

9.Caging a spring parking brake is the same as...

Progress 09/45

Truck Test 4

10.Which of the following negatively affect braking ability?

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Truck Test 4

11.Which of the following is a disadvantage of a control (service) line and foot and hand valve system?

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Truck Test 4

12.A/n _______ is an electronic system that monitors wheel speed at all times and controls wheel speed while braking

Progress 012/45

Truck Test 4

13.Tractors and trailers _______ ABS can be connected to one another without affecting the operation of the ABS.

Progress 013/45

Truck Test 4

14.If the foot valve is supplying a higher application pressure than the hand valve, a two-way check valve will allow air flow from which source?

Progress 014/45

Truck Test 4

15.On the pre-trip air brake inspection, you must ensure that the parking brake spring is not _______ or it will not expand and apply the brake.

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Truck Test 4

16.Which of the following is true of a basic dual air brake system?

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Truck Test 4

17.One gram is equal to how many ounces?

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Truck Test 4

18.What should be done to parked trailers without spring parking brakes to prevent a possible runaway?

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Truck Test 4

19.What protects the wet reservoir from becoming over pressurized?

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Truck Test 4

20.In an air-boost hydraulic brake system what is used to intensify the hydraulic pressure generated by the master cylinder?

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Truck Test 4

21.When inspecting brake adjustment on a single unit, the slack (pushrod travel) should be within how many inches within the manufacturer's specifications?

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Truck Test 4

22.One metre is equal to how many yards?

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Truck Test 4

23.At the first stop after adjusting the wedge type brakes, check each brake drum or rotor for temperature. An extra _______ brake drum indicates that you have _____ adjusted it.

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24.What is the upward motion of the piston that compresses the air in the cylinder known as?

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Truck Test 4

25.What would be the psi if 50 pounds were being forced onto 2 square inches?

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26.Choose the correct order of steps to secure a vehicle as part of a single unit pre-trip air brake inspection.

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23.At the first stop after adjusting the wedge type brakes, check each brake drum or rotor for temperature. An extra ___ brake drum indicates that you have _ adjusted it.

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41.An air dryer may be installed between the and the to help remove moisture from the compressed air.

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