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

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

Slack adjuster

Worm shaft

Worm gear

Spline

2 / 30

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

Past the one-way check valve

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

Past the low-pressure indicators

To the air dryer

3 / 30

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

A metal wall

A port

A flexible diaphragm

Nothing

4 / 30

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

The type of vehicle

Whether the tractor will be towing trailers

The number of brake chambers and their size

The size of compressor

5 / 30

What happens if the safety valve has to relieve pressure?

The brake chamber needs repair

There is a leak with an air hose

The two-way valve needs adjustment

The governor or compressor requires adjustment, service or repair

6 / 30

What are the primary and secondary reservoirs also known as?

Dry reservoir

Minor reservoir

Wet reservoir

Minimal reservoir

7 / 30

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

The warning buzzer goes off

A total loss of brakes

It reduces the effectiveness of the brake chamber

The vehicle quickly stops

8 / 30

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

Front are longer

Front are smaller

Rear are longer

Rear are smaller

9 / 30

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

Into the atmosphere

Back into the tanks

None of these

Into the brake chambers

10 / 30

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

It warms the air coming from the supply tank

None of these

It helps to keep the air hoses flexible

It prevents the moisture from freezing in cold climate operation

11 / 30

How id the push rod connected to the slack adjuster?

By a clevis and pin

By a lock screw

By a slack bolt

By a mounting bolt

12 / 30

Where would an air dryer be installed?

Below the foot valve

Between the compressor and the wet reservoir

Next to the governor

Next to the two-way valve

13 / 30

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

Only if a warning light on the dashboard illuminates

Yes

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

14 / 30

What happens in the reservoir when the heated air cools?

Nothing

It forms condensation

The air shrinks

The air expands

15 / 30

How often should the tanks be drained?

When a problem occurs

Every 48 hours

Daily

Weekly

16 / 30

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

It reduces the amount of compressed air allowable

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

It slows down the forced air

It adds additional weight to the system

17 / 30

What gets formed in the bottom of the supply reservoir?

Sludge

Rust

Flakes

Nothing

18 / 30

What compresses the air in the cylinder?

The drive belts

The governor

The upward motion of the piston

None of these

19 / 30

What is meant by the loading stage?

When the system pressure reaches its maximum

When the system pressure reaches its minimum

When the air is being added to the reservoir

When the air is being pushed through the air hoses

20 / 30

What does a safety valve do?

It protects the compressor from over-loading the system

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

It cuts off the governor when it begins to overwork

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

21 / 30

What is another name for the supply reservoir?

Wet reservoir

Primary reservoir

Maximum reservoir

Main reservoir

22 / 30

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

Effective braking is reduced and brake lag time is increased

A total brake failure

Parts of the brakes fall away

The brakes will grab and the vehicle stops abruptly

23 / 30

What does a slack adjuster do?

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

The lengthens the slack in the air hoses

None of these

It creates a slack when the brakes are malfunctioning

24 / 30

A safety valve is normally set at what psi?

120 psi

135 psi

170 psi

150 psi

25 / 30

What is the purpose of an air dryer?

To dry the brake pads

To reduce the amount of moisture in the system

To dry the brake drums

To dry the slack adjuster

26 / 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 air filter is plugged or if the belt is slipping

If the reservoir is full

27 / 30

What is another name for an automatic reservoir drain valve?

Drip valve

Master valve

Spitter valve

Major drain valve

28 / 30

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

4 minutes

5 minutes

3 minutes

2 minutes

29 / 30

A brake chamber is usually mounted where?

In the wheel hub

By the differential

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

Above the wheel that is equipped for braking

30 / 30

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

None of these

The pedal is thicker

They are spring loaded

The are stiffer

Your score is

Air Brake Practice Test 02

About

Practice Tests

Getting a License

Get In Touch