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

Q.1

Most heavy-duty vehicles use ____ air brake systems.

Single
Dual
Triple
Quad

Q.2

To make a stop in a vehicle using air brakes, the driver should:

Press down the brake pedal.
Lift the brake pedal toward them.
Push in the brake knob.
Pull out the brake knob.

Q.3

Braking mechanisms are located ____ a brake drum.

Outside
Inside
Next to
On top of

Q.4

Truck tractors with air brakes that were built on or after March 1, 1997 are equipped with:

An extra set of brakes.
Voice-activated brakes.
Cruise control.
Anti-Lock Braking Systems (ABS).

Q.5

Failing to drain air tanks could result in:

Water accumulations freezing and causing brake failure.
Squishy brakes.
Too much air collecting in the tanks.

Q.6

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.7

Foundation brakes are used:

Only on the front wheels of a vehicle.
Only on the rear wheels of a vehicle.
On each wheel of a vehicle.

Q.8

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.9

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 six months

Q.10

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.11

Vehicles with dual air brake systems:

Have air pressure in the braking system even when the vehicle is not running.
Maintain some air pressure in the braking system when the vehicle is not running.
Must be run to build air pressure to allow the brakes to operate properly.
Maintain air pressure when shut off for periods of less than four hours.

Q.12

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.13

If the spring brakes are on, you should:

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

Q.14

When leaving your vehicle unattended:

The parking brake must be always be used.
The parking brake should never be used.
Windows in the cab should be lowered.

Q.15

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.

Q.16

Air tank drains:

Should not be used in cold weather.
Are helpful to remove water and oil from the air tanks.
Are used to move air to the brakes.

Q.17

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.18

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.19

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.20

Why do large vehicles use air brakes?

Other brake systems squeak too loudly.
Air brakes are very effective systems.
Other braking systems are hard to come by.

Q.21

Foundation brakes are used:

Only at the front wheels.
Only at the rear wheels.
Only at the driver’s side wheels.
At each wheel.

Q.22

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.23

What kind of brakes do most newer heavy-duty trucks use?

Single air brakes
Dual air brakes
Triple air brakes

Q.24

Air brakes use ____ to function.

Compressed air
Liquid air
Nitrogen

Q.25

During an applied leakage test, what is the maximum leakage rate that is safe for a single vehicle with air brakes?

10 psi in one minute
5 psi in one minute
3 psi in one minute

0 h : 0 m : 1 s