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

Q.1

When using the controlled braking method in an emergency situation, you should:

Apply the brakes as hard as possible without locking the wheels.
Apply the brakes with about half of your usual force.
Apply the brakes so the wheels lock.
Apply the brakes with minimal pressure.

Q.2

What can happen if parking brakes are used in very wet weather with temperatures below freezing?

The brakes will squeak.
The brakes may freeze so the vehicle cannot move.
The brakes may suddenly release by themselves.
The brakes may become too smooth to be used.

Q.3

The air entering air storage tanks may contain:

Water and compressor oil.
Frost.
Gravel.
Antifreeze.

Q.4

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

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

Q.5

Failing to drain the tanks in an air brake system can result in:

Water freezing and causing brake failure.
Squishy brakes.
Too much air collecting.
Too much fuel being carried.

Q.6

Air brakes are:

An effective tool for stopping large vehicles.
Prohibited on large vehicles.
Only effective in poor weather.
A tool to improve fuel efficiency.

Q.7

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.8

A tank endorsement is:

Only required when transporting gases.
Only required when transporting liquids.
Used when transporting both liquids and gases.
Optional when transporting hazardous materials.

Q.9

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

Continue driving normally.
Activate your hazard lights and continue driving.
Call the local law enforcement agency.
Safely exit the roadway and stop.

Q.10

What can happen if a parking brake is used in very wet weather when temperatures are below freezing?

The brakes will squeak.
The brakes may freeze so the vehicle cannot move.
The brakes may suddenly release by themselves.
The brakes may explode.

Q.11

A vehicle equipped with an Anti-Lock Braking System (ABS) uses a ____ light to warn that the system is not working properly.

Green
Yellow
Orange
White

Q.12

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.13

In a vehicle with dual air brakes, what happens if one system is low on pressure?

The air from the other system will be used to supplement the system with the low pressure.
The front or rear brakes may not work properly.
All brakes will be inoperable.
The low system will use an auxiliary system to fill the tank.

Q.14

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.15

Emergency brakes:

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

Q.16

To ensure normal stopping power, drivers of vehicles equipped with a front brake limiting valve should:

Set the control to normal.
Set the control to the off position.
Set the control to neutral.
Keep the control at the halfway mark.

Q.17

Do not use the parking brake when parking if:

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

Q.18

Before driving a vehicle with a dual air brake system, you must wait for the air compressor to build a minimum of ____ in both the primary and secondary systems.

25 psi
50 psi
75 psi
100 psi

Q.19

What is removed when an air tank is drained?

Water and oil
Ammonia
Wood
Chlorine

Q.20

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.21

Service brakes should:

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

Q.22

If the spring brakes are activated, you should never:

Push down the brake pedal.
Open the hood.
Release air from the air storage tanks.
Open the door to the cab.

Q.23

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.24

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

A check valve
A lock
A trap door
An oxidizer

Q.25

What color is the low air pressure warning light?

Green
Orange
Red
Purple

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