Delaware CDL Air Brakes 1 - 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

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.3

ABS brakes:

Help you avoid wheel lockup.
Lock up your vehicle's wheels.
Prevent your vehicle from accelerating when going uphill.

Q.4

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.5

A wig wag is:

A low pressure warning device.
A tube that carries air to the brakes.
A type of air brake system.

Q.6

Truck tractors with air brakes built on or after March 1, 1997 must have:

An Anti-Lock Braking System (ABS).
Bluetooth.
A GPS.

Q.7

Truck tractors with air brakes built on or after March 1, 1997 must have:

An Anti-Lock Braking System (ABS).
Bluetooth.
GPS.
A rear back-up camera.

Q.8

What kind of force must emergency brakes use?

Air pressure
Mechanical
Heavy
Electrical

Q.9

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.10

To use the stab braking method in an emergency situation, you should:

Apply the brakes completely until the wheels lock up, release the brakes until the wheels start rolling, then repeat the process.
Apply the brakes about halfway, but keep the wheels rolling.
Fully apply the brakes, let the wheels lock up, and hold the brake pedal down, keeping the wheels locked until the vehicle stops.
Apply the emergency brake.

Q.11

In a vehicle with dual parking control valves, a separate air tank can be used:

To make the air brakes work more effectively.
To temporarily release the spring brakes.
To charge the brakes on the rear trailer.

Q.12

If the brake pads rub against the brake drums and create too much heat:

The brakes will stick.
The brakes will become extra sensitive.
The brakes may stop working.
The air compressor will kick on to cool the brakes.

Q.13

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

Headlights
Turn signals
Brake lights

Q.14

What kind of force do emergency brakes use?

Air pressure
Mechanical
Heavy

Q.15

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.16

What color are ABS malfunction lamps?

Orange
Yellow
Green
Blue

Q.17

Service brakes should:

Be tested once a month.
Only be tested by a trained mechanic.
Be tested before every trip.

Q.18

How should you test the low pressure warning signal?

Engage and disable the parking brake.
Rapidly press and release the brake pedal.
Open the rear shut-off valves.
Uncouple and recouple all glad hands.

Q.19

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.20

Friction in an S-cam brake is caused when the brake shoes and linings:

Press against the outside of the brake drum.
Press against the inside of the brake drum.
Push against each other.

Q.21

A ____ allows a driver to gradually apply spring brakes.

Modulating control valve
Trailer air supply control
Relay valve

Q.22

What can happen if the air pressure gets too low in an air brake system?

The brakes may squeak.
The brakes may not work.
The brakes may be sluggish.
The brakes will be very sensitive.

Q.23

Why do you need to drain air tanks regularly?

Because the air gets old and needs to be replaced
Because compressed air contains some water which must be drained from the tanks
To allow for a change in air pressure
To remove bad air from the tanks

Q.24

When the brake pedal is pushed down, air brakes work:

Immediately.
After a short delay.
After about a minute.
Only if it is warm outside.

Q.25

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.

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