Deck 1: Air Brakes

Question 1

The air that is used in air brakes is?

A)Heated air
B)Decompressed air
C)Compressed air
D)None of the above

Answer 1

Compressed air

Question 2

Commercial vehicles that utilize air brakes have three brake systems. They are?

A)Parking brake, service brake, emergency brake
B)Parking brake, hand brake, emergency brake
C)Service brake, emergency brake, anti-lock brake
D)Hand brake, emergency brake, service brake

Answer 2

Parking brake, service brake, emergency brake

Question 3

In the air brake system, the alcohol evaporator's primary purpose is to?

A)Add heat to the air tank unit
B)Add alcohol to the air braking system
C)Remove oil and water from the braking system
D)Remove excess alcohol from the braking system

Answer 3

Add alcohol to the air braking system

Question 4

The device that fills the air brake storage tanks is known as?

A)Safety valve
B)Evaporator
C)Air throttle governor
D)Air compressor

Question 5

The safety relief valve is pre-set to open when the psi level reaches?

A)65 psi
B)150 psi
C)120 psi
D)90 psi

Question 6

In an air brake system, the most common type of foundation brake is?

A)Disc brake
B)Anti-Lock brake
C)S-Cam drum brake
D)Wedge brake

Question 7

In terms of front wheel braking, which of the following is a true statement?

A)Front wheel braking does not work on slippery roads.
B)Front wheel braking is a good option under all road conditions.
C)Driver should use front brake limiting valves on icy roads.
D)Front wheel braking causes vehicle to skid on icy roads.

Question 8

The low air pressure warning must come on if the pressure reaches?

A)60 psi
B)55 psi
C)155 psi
D)75 psi

Question 9

In terms of spring brakes, the following statement is true:

A)Operation of spring brakes relies on air pressure.
B)Spring brakes should engage at 60 psi.
C)A loss of air pressure will cause spring brakes to fail.
D)Spring brakes are operated by mechanical force.

Question 10

The stopping power of spring brakes can be affected by which of the following:

A)Proper adjustment
B)Road conditions
C)Modulating control valve
D)All of the above

Question 11

To determine how much air pressure is in the air tanks, drivers should use which of the following indicators or devices?

A)Ammeter
B)Application pressure gauge
C)Supply pressure gauge
D)Low air pressure warning device or signal

Question 12

During the pre-trip inspection, which of the following should be checked?

A)Brake drums or discs
B)Air hoses going to brake chambers
C)S-cam brake slack adjusters
D)All of the above

Question 13

To check the air leakage rate on vehicles that use air brakes, drivers should:

A)Turn engine off and pump brakes
B)Turn engine on and release parking brake
C)Turn engine off and release parking brake
D)Turn engine on and pump brakes repeatedly

Question 14

The acceptable air loss rate when performing the air leakage test is:

A)Less than 3 psi in one minute for both single and combination vehicles
B)Less than 2 psi in one minute for single vehicles and less than 3 psi in one minute for combination vehicles
C)Less than 3 psi in one minute for single vehicles, less than 2 psi per minute for combination vehicles
D)Less than 2 psi per minute for both single and combination vehicles

Question 15

If the low air pressure warning comes on, drivers should:

A)Perform slow, stab braking until vehicle stops.
B)Proceed to the nearest service or repair station.
C)No action is needed at this time.
D)Stop and park the vehicle as soon as safely possible.

Question 16

On commercial vehicles that use air brakes and have ABS (Anti-Lock Braking Systems), if the ABS bulb stays on after the bulb test or comes on during operation, it can mean:

A)The vehicle may have lost ABS control in at least one wheel.
B)It means nothing, this is normal.
C)The air compressor may be malfunctioning.
D)The ABS bulb check was performed incorrectly.

Question 17

In terms of the ABS (Anti-Lock Braking System), which of the following are true?

A)ABS does not decrease normal braking capability.
B)ABS does not increase normal braking capability.
C)ABS only activates when the wheels are about to lock up.
D)All of the above are true.

Question 18

When performing the "stab braking" technique for sudden stops, you should:

A)Hit the brakes hard and not release them until you stop.
B)Apply brakes hard, release when wheels lock up, apply brakes again.
C)Pump the brakes as fast as you can.
D)None of the above

Question 19

On a dual air brake system, the two systems are known as:

A)The primary system and the secondary system
B)The foundation system and the axle braking system
C)The base system and the secondary system
D)The forward system and the rear system

Question 20

Heavy, repeated use of air brakes on a downhill slope can cause:

A)Nothing, air brakes are designed for this type of use.
B)The brakes to overheat, thus posing a danger of brake loss
C)The engine to overheat
D)Dangerous increase in oil pressure