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

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

A flexible diaphragm

A port

A metal wall

Nothing

2 / 30

What happens if the safety valve has to relieve pressure?

There is a leak with an air hose

The brake chamber needs repair

The two-way valve needs adjustment

The governor or compressor requires adjustment, service or repair

3 / 30

What compresses the air in the cylinder?

None of these

The upward motion of the piston

The drive belts

The governor

4 / 30

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

Into the brake chambers

None of these

Back into the tanks

Into the atmosphere

5 / 30

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

3 minutes

5 minutes

2 minutes

4 minutes

6 / 30

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

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

It adds additional weight to the system

It reduces the amount of compressed air allowable

It slows down the forced air

7 / 30

What is another name for an automatic reservoir drain valve?

Major drain valve

Drip valve

Spitter valve

Master valve

8 / 30

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

Spline

Worm gear

Slack adjuster

Worm shaft

9 / 30

Where would an air dryer be installed?

Below the foot valve

Between the compressor and the wet reservoir

Next to the two-way valve

Next to the governor

10 / 30

What happens in the reservoir when the heated air cools?

Nothing

The air expands

It forms condensation

The air shrinks

11 / 30

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

Whether the tractor will be towing trailers

The number of brake chambers and their size

The size of compressor

The type of vehicle

12 / 30

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

The warning buzzer goes off

It reduces the effectiveness of the brake chamber

A total loss of brakes

The vehicle quickly stops

13 / 30

A safety valve is normally set at what psi?

120 psi

150 psi

170 psi

135 psi

14 / 30

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

The pedal is thicker

They are spring loaded

None of these

The are stiffer

15 / 30

What does a slack adjuster do?

The lengthens the slack in the air hoses

None of these

It creates a slack when the brakes are malfunctioning

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

16 / 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 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

17 / 30

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

Rear are longer

Front are longer

Front are smaller

Rear are smaller

18 / 30

What is meant by the loading stage?

When the air is being added to the reservoir

When the system pressure reaches its minimum

When the air is being pushed through the air hoses

When the system pressure reaches its maximum

19 / 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

20 / 30

What is another name for the supply reservoir?

Wet reservoir

Main reservoir

Maximum reservoir

Primary reservoir

21 / 30

What are the primary and secondary reservoirs also known as?

Dry reservoir

Wet reservoir

Minor reservoir

Minimal reservoir

22 / 30

A brake chamber is usually mounted where?

By the differential

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

23 / 30

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

The brakes will grab and the vehicle stops abruptly

Parts of the brakes fall away

Effective braking is reduced and brake lag time is increased

A total brake failure

24 / 30

How id the push rod connected to the slack adjuster?

By a slack bolt

By a mounting bolt

By a lock screw

By a clevis and pin

25 / 30

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

Yes

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

Only if a warning light on the dashboard illuminates

26 / 30

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

Past the low-pressure indicators

Past the one-way check valve

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

To the air dryer

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

If the governor has stopped

If the reservoir is full

28 / 30

How often should the tanks be drained?

Daily

When a problem occurs

Every 48 hours

Weekly

29 / 30

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

It helps to keep the air hoses flexible

It prevents the moisture from freezing in cold climate operation

It warms the air coming from the supply tank

None of these

30 / 30

What gets formed in the bottom of the supply reservoir?

Rust

Flakes

Sludge

Nothing

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Air Brake Practice Test 02

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