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

Q.1

When parking, you should not use the parking brake if:

The brakes are very hot.
The brakes are very cold.
There is snow on the ground.

Q.2

During an applied leakage test, the maximum leakage rate for a triple combination vehicle is:

10 psi in a minute.
8 psi in a minute.
6 psi in a minute.
4 psi in a minute.

Q.3

To stop in a vehicle that uses air brakes, the driver should:

Pull the air brake lever.
Engage the brake lever.
Push the brake pedal down.
Pull the brake pedal up.

Q.4

A low air pressure warning signal:

Is not recommended on vehicles with air brakes.
Is required on vehicles with air brakes.
Is optional on vehicles with air brakes.

Q.5

What does the air compressor governor do?

Controls when the air compressor pumps air into the air storage tanks.
Controls how quickly air leaves the air storage tanks.
Controls the temperature of the air entering the air storage tanks.
Controls the temperature of the air leaving the air storage tanks.

Q.6

When parked on a flat surface, you should:

Use wheel chocks to prevent your vehicle from moving.
Not use wheel chocks.
Use wheel chocks, but only if you have applied the parking brake.

Q.7

What is removed when an air tank is drained?

Water and oil
Ammonia
Wood
Chlorine

Q.8

What must be on an air tank in an air-braked vehicle?

A check valve
A lock
A trap door
An oxidizer

Q.9

In a dual air brake system, air pressure should build from 85 to 100 psi within ____ seconds.

25
10
45

Q.10

What should happen if the air pressure in the air brake system tanks falls below 60 psi?

A warning light should come on.
Lights should flash on the outside of the vehicle.
A message should appear on the control panel.
The vehicle should stop.

Q.11

In a vehicle with dual parking control valves, once air pressure is lost and the spring brakes come on:

You will be unable to move the vehicle.
A separate air tank can be used to release the spring brakes for a short period of time.
You can use the spring brakes to continue driving normally.
The air tanks will automatically refill to a safe air pressure level.

Q.12

The parking brake in a newer vehicle is applied by:

Moving a lever to the right.
Pushing a yellow, diamond-shaped knob.
Pulling a yellow, diamond-shaped knob.

Q.13

If one air system in a dual air brake system is very low on pressure:

None of the brakes will work at all.
Either the front or rear brakes will not be operating fully.
There will be no noticeable affect.
Lights on the outside of the tractor will flash.

Q.14

An air compressor governor will stop the compressor from pumping air once the air tanks have an air pressure level of:

125 psi.
100 psi.
150 psi.
80 psi.

Q.15

When you need to stop in an emergency, you should:

Lock the wheels and skid to a stop.
Stop in a way that keeps your vehicle in a straight line.
Stop in a way that turns your vehicle.
Expect your vehicle to slow down more quickly than usual.

Q.16

During a static leakage test, what is the maximum leakage rate that is safe for a double combination vehicle?

3 psi in one minute.
6 psi in one minute.
8 psi in one minute.

Q.17

Spring brakes come on:

When too much air pressure is lost.
When a control on the dashboard is activated.
When the tires have minimal tread depth.
When the brakes are noisy.

Q.18

Brake fade is a result of:

Exposure to sunlight.
Exposure to moisture.
Excessive use.
Not using the brakes enough.

Q.19

The ____ tells a driver how much pressure is in the air tanks.

Application pressure gauge
Air compressor governor
Supply pressure gauge
Drum brake

Q.20

What helps prevent wheel lockup when braking?

An Anti-Lock Braking System (ABS)
Air brakes
An alternator

Q.21

Alcohol evaporators are:

Illegal.
Used to add alcohol to braking systems to prevent items from freezing.
Only allowed on vehicles carrying hazardous materials.

Q.22

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.23

A driver can rely on front wheel braking to work:

On dry roadways only.
Under all conditions.
Under all conditions, except for snow.

Q.24

If your tractor is equipped with ABS but your trailer is not, the ABS:

Will not be effective.
Will still improve your steering control.
Will make jackknifing easier.
Will allow others to see when you brake.

Q.25

Pressing and releasing a brake pedal unnecessarily can:

Release air faster than it can be replaced.
Add more air to the braking system.
Make the brake pedal more sensitive.
Create a loud noise.

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