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

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

Past the one-way check valve

Past the low-pressure indicators

To the air dryer

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

2 / 30

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

Nothing

A flexible diaphragm

A port

A metal wall

3 / 30

What happens in the reservoir when the heated air cools?

The air shrinks

It forms condensation

The air expands

Nothing

4 / 30

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

The type of vehicle

The number of brake chambers and their size

The size of compressor

Whether the tractor will be towing trailers

5 / 30

What does a slack adjuster do?

It creates a slack when the brakes are malfunctioning

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

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

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

8 / 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

None of these

It helps to keep the air hoses flexible

9 / 30

What happens if the safety valve has to relieve pressure?

The two-way valve needs adjustment

The brake chamber needs repair

The governor or compressor requires adjustment, service or repair

There is a leak with an air hose

10 / 30

A safety valve is normally set at what psi?

150 psi

120 psi

170 psi

135 psi

11 / 30

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

Front are longer

Rear are longer

Front are smaller

Rear are smaller

12 / 30

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

Slack adjuster

Spline

Worm shaft

Worm gear

13 / 30

How often should the tanks be drained?

Daily

Every 48 hours

When a problem occurs

Weekly

14 / 30

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

Effective braking is reduced and brake lag time is increased

The brakes will grab and the vehicle stops abruptly

Parts of the brakes fall away

A total brake failure

15 / 30

Where would an air dryer be installed?

Next to the two-way valve

Next to the governor

Below the foot valve

Between the compressor and the wet reservoir

16 / 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 brake pads

To dry the slack adjuster

17 / 30

What does a safety valve do?

It cuts off the governor when it begins to overwork

It protects the compressor from over-loading the system

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

18 / 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

19 / 30

What is another name for an automatic reservoir drain valve?

Master valve

Major drain valve

Spitter valve

Drip valve

20 / 30

What is another name for the supply reservoir?

Maximum reservoir

Wet reservoir

Primary reservoir

Main reservoir

21 / 30

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

Into the brake chambers

Back into the tanks

Into the atmosphere

None of these

22 / 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

23 / 30

What gets formed in the bottom of the supply reservoir?

Sludge

Rust

Nothing

Flakes

24 / 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 two-way valve is closed

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

If the reservoir is full

25 / 30

What are the primary and secondary reservoirs also known as?

Dry reservoir

Minor reservoir

Wet reservoir

Minimal reservoir

26 / 30

How id the push rod connected to the slack adjuster?

By a lock screw

By a clevis and pin

By a mounting bolt

By a slack bolt

27 / 30

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

The vehicle quickly stops

It reduces the effectiveness of the brake chamber

The warning buzzer goes off

A total loss of brakes

28 / 30

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

It slows down the forced air

It reduces the amount of compressed air allowable

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

It adds additional weight to the system

29 / 30

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

They are spring loaded

None of these

The pedal is thicker

The are stiffer

30 / 30

What compresses the air in the cylinder?

None of these

The upward motion of the piston

The governor

The drive belts

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Air Brake Practice Test 02

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