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 does a safety valve do?

It protects the compressor from over-loading the system

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

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

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

The warning buzzer goes off

A total loss of brakes

3 / 30

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

5 minutes

3 minutes

4 minutes

2 minutes

4 / 30

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

Worm shaft

Spline

Slack adjuster

Worm gear

5 / 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

6 / 30

What happens if the safety valve has to relieve pressure?

The governor or compressor requires adjustment, service or repair

The two-way valve needs adjustment

The brake chamber needs repair

There is a leak with an air hose

7 / 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

8 / 30

A safety valve is normally set at what psi?

120 psi

170 psi

135 psi

150 psi

9 / 30

What is meant by the loading stage?

When the system pressure reaches its minimum

When the air is being added to the reservoir

When the system pressure reaches its maximum

When the air is being pushed through the air hoses

10 / 30

What is the purpose of an air dryer?

To dry the brake pads

To dry the slack adjuster

To reduce the amount of moisture in the system

To dry the brake drums

11 / 30

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

Parts of the brakes fall away

The brakes will grab and the vehicle stops abruptly

Effective braking is reduced and brake lag time is increased

A total brake failure

12 / 30

Where would an air dryer be installed?

Next to the governor

Next to the two-way valve

Below the foot valve

Between the compressor and the wet reservoir

13 / 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

14 / 30

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

A port

A flexible diaphragm

Nothing

A metal wall

15 / 30

What compresses the air in the cylinder?

The governor

None of these

The upward motion of the piston

The drive belts

16 / 30

What gets formed in the bottom of the supply reservoir?

Flakes

Sludge

Rust

Nothing

17 / 30

What are the primary and secondary reservoirs also known as?

Minor reservoir

Minimal reservoir

Dry reservoir

Wet reservoir

18 / 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

19 / 30

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

It reduces the amount of compressed air allowable

It adds additional weight to the system

It slows down the forced air

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

20 / 30

What happens in the reservoir when the heated air cools?

Nothing

The air expands

It forms condensation

The air shrinks

21 / 30

What is another name for the supply reservoir?

Wet reservoir

Main reservoir

Primary reservoir

Maximum reservoir

22 / 30

A brake chamber is usually mounted where?

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

In the wheel hub

By the differential

Above the wheel that is equipped for braking

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 two-way valve is closed

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

If the reservoir is full

24 / 30

What is another name for an automatic reservoir drain valve?

Drip valve

Master valve

Spitter valve

Major drain valve

25 / 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

To the air dryer

Past the one-way check valve

Past the low-pressure indicators

26 / 30

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

The size of compressor

Whether the tractor will be towing trailers

The number of brake chambers and their size

The type of vehicle

27 / 30

How often should the tanks be drained?

Daily

Every 48 hours

Weekly

When a problem occurs

28 / 30

What does a slack adjuster do?

None of these

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

The lengthens the slack in the air hoses

29 / 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

30 / 30

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

Back into the tanks

None of these

Into the atmosphere

Into the brake chambers

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Air Brake Practice Test 02

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