North Carolina CDL Air Brakes 2 - DMV Written Test Questions with Answers - MCQGeeks.com

Q.1

If you are braking on dry pavement while traveling at 55 mph, how much distance will brake lag add to your overall stopping distance?

32 feet
45 feet
20 feet

Q.2

If an air compressor is belt-driven, the belt should be routinely checked to ensure that it is:

Thin.
Properly tightened.
Cracked.

Q.3

If the low pressure warning signal activates while you are driving, you should:

Continue driving normally.
Exit the road and park as soon as safely possible.
Stop where you are and park.
Put on your hazard lights and continue driving.

Q.4

The most common type of foundation brake used is the:

S-cam drum brake.
C-cam drum brake.
G-cam disc brake.
P-cam disc brake.

Q.5

To confirm that a trailer has ABS, you can:

Look under the trailer for wheel speed sensors coming from the back of the brakes.
Look under the hood for the ABS sticker.
Look at the tires.
Remove a tire and look for the ABS sensor on the axle.

Q.6

An air compressor governor controls:

When the air compressor pumps air into the air storage tanks.
How fast air is pumped into the air storage tanks.
The temperature of the air pumped into the air storage tanks.

Q.7

When traveling down a steep downgrade:

The air brakes should be used.
The vehicle should be placed in a low gear and the driver should use engine braking.
The driver should continually downshift instead of using the brakes.

Q.8

When stopping in an emergency situation, you should:

Veer your trailer to the right and stop.
Stop in a straight line.
Veer your trailer to the left and stop.

Q.9

What happens if the air pressure in a system's air tanks falls below 60 psi?

A warning light will come on.
The vehicle will not shift out of gear.
The front lights will flash.
The vehicle should stop.

Q.10

If using air tanks with manually operated drains, how often should you drain the tanks?

Every day
Once a week
Once a month
Once every 3,000 miles

Q.11

If air pressure drops to a level between ____, a visual low pressure warning signal should have already activated.

55 and 75 psi.
80 and 95 psi.
65 and 100 psi.

Q.12

Emergency brakes:

Are not required on trucks.
Are only required on trailers.
Are required on tractors.
Are optional.

Q.13

All air tanks must include:

A drain valve.
A lock.
A trap door.
A warning sticker.

Q.14

Why should you regularly drain the air tanks?

Because the air gets old and needs to be replaced
Because compressed air contains some water and the water collects in the tanks
To allow for a change in pressure

Q.15

In a vehicle with dual air brakes, a leak in one system ____ the second system.

Will always affect
May not affect
Is caused by

Q.16

If the spring brakes are on, you should:

Not use the brake pedal.
Press the accelerator.
Move the steering wheel.

Q.17

On a truck with air brakes, the braking system’s air compressor:

Pumps air into the air storage tanks.
Fills the tires.
Moves air to the back of the truck.
Cleans the brakes.

Q.18

What should happen before the air pressure in an air brake system tank falls below 55 psi?

The warning light should activate.
The vehicle will be unable to shift out of gear.
The front lights should flash.

Q.19

If the low pressure warning light comes on while you are driving:

Braking will only occur if there is enough air in the tanks.
You can brake 14 times before the air in the system runs out.
You should continue to drive normally and check the brake system when it is convenient.
You should continue driving, but turn the emergency flashers on to warn other motorists.

Q.20

A dual air brake system:

Has a single air brake system, but uses two sets of controls.
Has one air brake system for each side of the truck.
Has two brakes for each wheel.
Has two separate air brake systems, but uses a single set of controls.

Q.21

In a dual air brake system, a leak in one system:

Always means there are leaks in both systems.
May not affect the other system.
Is not something to worry about.
Will also affect the other system.

Q.22

Front brake limiting valves were intended to:

Prevent the front tires from skidding.
Prevent the front tires from overheating.
Create equal brake usage.
Remove uncertainty when applying the brakes.

Q.23

When operating a vehicle with a dual brake system, a driver should:

Let the vehicle warm up before driving to ensure that fuel reaches the engine.
Wait to begin driving until the air compressor builds up a minimum pressure of 100 psi in both the primary and secondary systems.
Begin driving just after the vehicle starts.
Pump the pedal about 20 times to build pressure, then begin driving.

Q.24

The air pressure in a dual air brake system should build from 85 to 100 psi within:

Two minutes.
15 seconds.
10 minutes.
45 seconds.

Q.25

When leaving a vehicle unattended, a driver should:

Always set the parking brake.
Only set the parking brake if the vehicle is parked on a slope.
Deflate the tires by 10 percent.

0 h : 0 m : 1 s