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

How often should the tanks be drained?

When a problem occurs

Weekly

Every 48 hours

Daily

2 / 30

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

Past the one-way check valve

To the air dryer

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

Past the low-pressure indicators

3 / 30

What happens in the reservoir when the heated air cools?

It forms condensation

The air shrinks

The air expands

Nothing

4 / 30

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

The vehicle quickly stops

A total loss of brakes

The warning buzzer goes off

It reduces the effectiveness of the brake chamber

5 / 30

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

2 minutes

5 minutes

3 minutes

4 minutes

6 / 30

A brake chamber is usually mounted where?

Above the wheel that is equipped for braking

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

In the wheel hub

By the differential

7 / 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

The brakes will grab and the vehicle stops abruptly

Parts of the brakes fall away

8 / 30

What does a slack adjuster do?

None of these

It creates a slack when the brakes are malfunctioning

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

9 / 30

Where would an air dryer be installed?

Between the compressor and the wet reservoir

Next to the two-way valve

Next to the governor

Below the foot valve

10 / 30

What is another name for an automatic reservoir drain valve?

Major drain valve

Spitter valve

Master valve

Drip valve

11 / 30

What compresses the air in the cylinder?

The upward motion of the piston

The governor

None of these

The drive belts

12 / 30

What does a safety valve do?

It cuts off the governor when it begins to overwork

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

It protects the compressor from over-loading the system

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

13 / 30

What is the purpose of an air dryer?

To reduce the amount of moisture in the system

To dry the brake drums

To dry the slack adjuster

To dry the brake pads

14 / 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

15 / 30

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

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

Only if a warning light on the dashboard illuminates

Yes

16 / 30

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

Rear are longer

Front are longer

Rear are smaller

Front are smaller

17 / 30

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

Worm shaft

Worm gear

Spline

Slack adjuster

18 / 30

A safety valve is normally set at what psi?

135 psi

120 psi

150 psi

170 psi

19 / 30

What gets formed in the bottom of the supply reservoir?

Nothing

Sludge

Flakes

Rust

20 / 30

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

None of these

Into the atmosphere

Back into the tanks

Into the brake chambers

21 / 30

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

None of these

The pedal is thicker

The are stiffer

They are spring loaded

22 / 30

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

Nothing

A port

A metal wall

A flexible diaphragm

23 / 30

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

If the governor has stopped

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

If the reservoir is full

If the two-way valve is closed

24 / 30

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

It warms the air coming from the supply tank

It prevents the moisture from freezing in cold climate operation

It helps to keep the air hoses flexible

None of these

25 / 30

What is another name for the supply reservoir?

Primary reservoir

Maximum reservoir

Wet reservoir

Main reservoir

26 / 30

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

The number of brake chambers and their size

The size of compressor

Whether the tractor will be towing trailers

The type of vehicle

27 / 30

How id the push rod connected to the slack adjuster?

By a lock screw

By a mounting bolt

By a slack bolt

By a clevis and pin

28 / 30

What are the primary and secondary reservoirs also known as?

Minor reservoir

Dry reservoir

Minimal reservoir

Wet reservoir

29 / 30

What is meant by the loading stage?

When the system pressure reaches its maximum

When the air is being added to the reservoir

When the air is being pushed through the air hoses

When the system pressure reaches its minimum

30 / 30

What happens if the safety valve has to relieve pressure?

There is a leak with an air hose

The governor or compressor requires adjustment, service or repair

The two-way valve needs adjustment

The brake chamber needs repair

Your score is

Air Brake Practice Test 02

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