Nevada CDL Air Brakes 1 - DMV Written Test Questions with Answers - MCQGeeks.com

Q.1

Emergency brakes are:

Not required on trucks.
Only required on trailers.
Required on tractors.
Only required when transporting hazardous materials.

Q.2

Air pressure should build up in a single air system within:

15 minutes.
12 minutes.
Three minutes.

Q.3

A one-way check valve:

Drains the water and compressor oil from the air tanks.
Prevents air from escaping if the air compressor has a leak.
Activates the emergency brakes when there is a leak.
Holds the spring brakes in position until they are used.

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

During a walk-around inspection, ensure there are no cracks on the brake drums that are more than ____ of the width of the friction area.

One half
One quarter
One third
One tenth

Q.6

The two markings on a front brake limiting valve usually read:

"Normal" and "slippery."
"Low" and "high."
"Left" and "right."

Q.7

Brake linings should be:

Loose.
Free of oil.
Soft.

Q.8

When traveling down a steep downgrade, the best way to use your brakes is to:

Ride the brakes all the way down the hill.
Apply the brakes for a few seconds, then release the brakes for a few seconds. Continue to repeat these steps as you travel down the hill.
Apply the brakes only near the bottom of the downgrade.
Apply consistent pressure to the brake pedal all the way down the hill.

Q.9

The air entering air storage tanks may contain:

Water and compressor oil.
Frost.
Gravel.
Antifreeze.

Q.10

Air tank drains should:

Not be used by the driver.
Only be used when it is wet outside.
Be used to drain the tanks completely.

Q.11

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

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

Q.12

If a vehicle has air brakes, the air compressor drive belt should be checked before each drive. In what condition should the belt be?

Loose
Tight
Cracked
Bumpy

Q.13

If the air pressure warning light comes on, you should:

Continue to drive normally.
Drive with one foot on the accelerator and one foot on the brake pedal.
Call the local law enforcement agency.
Safely exit the roadway and stop.

Q.14

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

25
10
45

Q.15

The application pressure gauge:

Shows how much air pressure is being applied to the brakes.
Shows the temperature of air being used in the braking system.
Shows the pressure of the air coming from the compressor.
Shows the number of times the brakes have been used.

Q.16

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.17

A modulating control valve can control the:

Spring brakes.
Landing gear.
Air brakes.
Anti-lock braking system (ABS).

Q.18

If the spring brakes are on, you should:

Not use the brake pedal.
Press the accelerator.
Move the steering wheel.
Be especially careful because the brakes may fail.

Q.19

While operating on a downgrade, you should brake until you reach a speed that is:

5 mph below your safe speed.
10 mph below your safe speed.
15 mph below your safe speed.

Q.20

A ____ allows a driver to gradually apply spring brakes.

Modulating control valve
Trailer air supply control
Relay valve

Q.21

The ____ are activated by an electric switch that is triggered by the brake pedal.

Headlights
Turn signals
Brake lights

Q.22

Using the brakes creates heat. If too much heat is produced:

The brakes may not work.
The brakes may squeak more than usual.
The brakes will brake unevenly.

Q.23

In a dual air brake system:

Air tanks are shared by both systems.
Each system has its own air tanks.
You must designate which system you are using.
Brakes on only one side of the vehicle will work.

Q.24

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.25

Before driving a vehicle with air brakes, you should ensure that the ____ come on automatically when air pressure falls below 45 psi.

Spring brakes
Parking brakes
Air brakes

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