Air Brake Practice Test 02

By practicing with this test, you can identify any knowledge gaps and areas that require further study. Additionally, the test will provide you with a realistic simulation of the actual exam, which will help you to become familiar with the format and timing. With dedicated practice and focused study, you can confidently take your official air break exam and pass with flying colors. Remember, the key to success is consistent practice and preparation.

1 / 30

What's the difference between front brake chambers and rear brake chambers?

Front are longer

Front are smaller

Rear are smaller

Rear are longer

2 / 30

If a leak occurs in the diaphragm, air is allowed to escape causing what to happen?

It reduces the effectiveness of the brake chamber

The vehicle quickly stops

A total loss of brakes

The warning buzzer goes off

3 / 30

What does a safety valve do?

It stops the air flow from the compressor to the supply tank

It protects reservoirs from becoming over pressurized and bursting if the governor malfunctioned and did not place the compressor in the unloading stage

It cuts off the governor when it begins to overwork

It protects the compressor from over-loading the system

4 / 30

What gets formed in the bottom of the supply reservoir?

Rust

Sludge

Flakes

Nothing

5 / 30

How id the push rod connected to the slack adjuster?

By a lock screw

By a slack bolt

By a mounting bolt

By a clevis and pin

6 / 30

What is another name for the supply reservoir?

Wet reservoir

Main reservoir

Primary reservoir

Maximum reservoir

7 / 30

How often should the tanks be drained?

Daily

Weekly

Every 48 hours

When a problem occurs

8 / 30

A brake chamber is usually mounted where?

By the differential

On the axle, near the wheel that is to be equipped for braking

In the wheel hub

Above the wheel that is equipped for braking

9 / 30

What are the primary and secondary reservoirs also known as?

Dry reservoir

Wet reservoir

Minor reservoir

Minimal reservoir

10 / 30

Why do air treadles provide a different feel from hydraulic brake applications?

They are spring loaded

None of these

The are stiffer

The pedal is thicker

11 / 30

What does a slack adjuster do?

None of these

The lengthens the slack in the air hoses

It adjusts the 'slack' or free play in the linkage between the push rod and the brake shoes

It creates a slack when the brakes are malfunctioning

12 / 30

As the piston nears the top of the stroke, the pressurized air is forced where?

Past the discharge valve and into the discharge line leading to the reservoir

Past the low-pressure indicators

Past the one-way check valve

To the air dryer

13 / 30

What is the purpose of an air dryer?

To dry the slack adjuster

To dry the brake drums

To dry the brake pads

To reduce the amount of moisture in the system

14 / 30

What would stop a compressor to not be able to build air pressure rom 50 to 90 psi within three minutes?

If the two-way valve is closed

If the governor has stopped

If the reservoir is full

If the air filter is plugged or if the belt is slipping

15 / 30

When the driver releases the treadle where does the air get released to?

Into the brake chambers

None of these

Into the atmosphere

Back into the tanks

16 / 30

What's the purpose of the heater element in the purge valve?

None of these

It prevents the moisture from freezing in cold climate operation

It warms the air coming from the supply tank

It helps to keep the air hoses flexible

17 / 30

The push rod is connected to a crank arm-type lever called what?

Slack adjuster

Worm gear

Spline

Worm shaft

18 / 30

What would happen if sludge accumulated in the bottom of the tank?

It adds additional weight to the system

It could enter the braking system and could cause trouble with valves and other parts

It slows down the forced air

It reduces the amount of compressed air allowable

19 / 30

A brake chamber is a circular container divided in the middle by what?

A metal wall

A port

Nothing

A flexible diaphragm

20 / 30

What is meant by the loading stage?

When the air is being pushed through the air hoses

When the system pressure reaches its maximum

When the air is being added to the reservoir

When the system pressure reaches its minimum

21 / 30

A safety valve is normally set at what psi?

170 psi

135 psi

120 psi

150 psi

22 / 30

What happens in the reservoir when the heated air cools?

The air expands

The air shrinks

It forms condensation

Nothing

23 / 30

What happens if the slack adjusters are not adjusted within the limitations?

Parts of the brakes fall away

Effective braking is reduced and brake lag time is increased

The brakes will grab and the vehicle stops abruptly

A total brake failure

24 / 30

The compressor must be able to build reservoir air pressure from 50 to 90 psi within how fast?

5 minutes

2 minutes

4 minutes

3 minutes

25 / 30

What happens if the safety valve has to relieve pressure?

The two-way valve needs adjustment

The brake chamber needs repair

There is a leak with an air hose

The governor or compressor requires adjustment, service or repair

26 / 30

The number and size of the reservoirs on a vehicle will depend on what?

Whether the tractor will be towing trailers

The size of compressor

The type of vehicle

The number of brake chambers and their size

27 / 30

Where would an air dryer be installed?

Next to the governor

Between the compressor and the wet reservoir

Next to the two-way valve

Below the foot valve

28 / 30

What is another name for an automatic reservoir drain valve?

Major drain valve

Spitter valve

Master valve

Drip valve

29 / 30

What compresses the air in the cylinder?

The upward motion of the piston

The drive belts

The governor

None of these

30 / 30

Do automatic reservoir drain valves still need to be checked daily?

Only if a warning light on the dashboard illuminates

Only if there is too much of a lag in the braking

Yes

Your score is

Air Brake Practice Test 02

About

Practice Tests

Getting a License

Get In Touch