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

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

Into the atmosphere

None of these

Into the brake chambers

Back into the tanks

2 / 30

What happens in the reservoir when the heated air cools?

Nothing

It forms condensation

The air expands

The air shrinks

3 / 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 brake chamber needs repair

The two-way valve needs adjustment

4 / 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

5 / 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

6 / 30

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

A port

A metal wall

A flexible diaphragm

Nothing

7 / 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

8 / 30

What is another name for the supply reservoir?

Maximum reservoir

Primary reservoir

Wet reservoir

Main reservoir

9 / 30

How often should the tanks be drained?

Daily

Every 48 hours

When a problem occurs

Weekly

10 / 30

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

The are stiffer

The pedal is thicker

None of these

They are spring loaded

11 / 30

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

A total brake failure

The brakes will grab and the vehicle stops abruptly

Effective braking is reduced and brake lag time is increased

Parts of the brakes fall away

12 / 30

What does a slack adjuster do?

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

The lengthens the slack in the air hoses

13 / 30

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

None of these

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

14 / 30

Where would an air dryer be installed?

Between the compressor and the wet reservoir

Below the foot valve

Next to the governor

Next to the two-way valve

15 / 30

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

Spline

Worm shaft

Slack adjuster

Worm gear

16 / 30

What is the purpose of an air dryer?

To dry the brake drums

To dry the slack adjuster

To dry the brake pads

To reduce the amount of moisture in the system

17 / 30

What are the primary and secondary reservoirs also known as?

Minor reservoir

Minimal reservoir

Wet reservoir

Dry reservoir

18 / 30

What compresses the air in the cylinder?

The governor

The upward motion of the piston

The drive belts

None of these

19 / 30

A safety valve is normally set at what psi?

135 psi

120 psi

170 psi

150 psi

20 / 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 warning buzzer goes off

A total loss of brakes

The vehicle quickly stops

21 / 30

What is another name for an automatic reservoir drain valve?

Drip valve

Master valve

Major drain valve

Spitter valve

22 / 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

Whether the tractor will be towing trailers

The size of compressor

23 / 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 slows down the forced air

It reduces the amount of compressed air allowable

It adds additional weight to the system

24 / 30

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

3 minutes

2 minutes

4 minutes

5 minutes

25 / 30

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

Yes

Only if a warning light on the dashboard illuminates

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

26 / 30

How id the push rod connected to the slack adjuster?

By a lock screw

By a mounting bolt

By a clevis and pin

By a slack bolt

27 / 30

What gets formed in the bottom of the supply reservoir?

Sludge

Nothing

Flakes

Rust

28 / 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 system pressure reaches its minimum

When the air is being pushed through the air hoses

29 / 30

What does a safety valve do?

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

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

30 / 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

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Air Brake Practice Test 02

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