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

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

2 / 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 governor has stopped

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

If the reservoir is full

3 / 30

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

Front are longer

Rear are smaller

Front are smaller

Rear are longer

4 / 30

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

It helps to keep the air hoses flexible

None of these

It warms the air coming from the supply tank

It prevents the moisture from freezing in cold climate operation

5 / 30

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

None of these

Into the atmosphere

Into the brake chambers

Back into the tanks

6 / 30

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

5 minutes

4 minutes

2 minutes

3 minutes

7 / 30

How often should the tanks be drained?

Every 48 hours

Daily

Weekly

When a problem occurs

8 / 30

What is the purpose of an air dryer?

To reduce the amount of moisture in the system

To dry the slack adjuster

To dry the brake drums

To dry the brake pads

9 / 30

What does a slack adjuster do?

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

None of these

The lengthens the slack in the air hoses

10 / 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 slows down the forced air

It reduces the amount of compressed air allowable

11 / 30

What compresses the air in the cylinder?

None of these

The drive belts

The governor

The upward motion of the piston

12 / 30

How id the push rod connected to the slack adjuster?

By a mounting bolt

By a slack bolt

By a clevis and pin

By a lock screw

13 / 30

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

The are stiffer

They are spring loaded

None of these

The pedal is thicker

14 / 30

What does a safety valve do?

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

It cuts off the governor when it begins to overwork

It protects the compressor from over-loading the system

15 / 30

A brake chamber is usually mounted where?

In the wheel hub

By the differential

Above the wheel that is equipped for braking

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

16 / 30

What happens if the safety valve has to relieve pressure?

The two-way valve needs adjustment

There is a leak with an air hose

The governor or compressor requires adjustment, service or repair

The brake chamber needs repair

17 / 30

What gets formed in the bottom of the supply reservoir?

Sludge

Nothing

Flakes

Rust

18 / 30

A safety valve is normally set at what psi?

170 psi

150 psi

135 psi

120 psi

19 / 30

Where would an air dryer be installed?

Between the compressor and the wet reservoir

Below the foot valve

Next to the two-way valve

Next to the governor

20 / 30

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

Slack adjuster

Spline

Worm shaft

Worm gear

21 / 30

What is another name for an automatic reservoir drain valve?

Drip valve

Master valve

Major drain valve

Spitter valve

22 / 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

23 / 30

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

The size of compressor

The type of vehicle

The number of brake chambers and their size

Whether the tractor will be towing trailers

24 / 30

What is another name for the supply reservoir?

Main reservoir

Primary reservoir

Maximum reservoir

Wet reservoir

25 / 30

What is meant by the loading stage?

When the system pressure reaches its maximum

When the air is being pushed through the air hoses

When the air is being added to the reservoir

When the system pressure reaches its minimum

26 / 30

What happens in the reservoir when the heated air cools?

The air shrinks

It forms condensation

The air expands

Nothing

27 / 30

What are the primary and secondary reservoirs also known as?

Minimal reservoir

Dry reservoir

Minor reservoir

Wet reservoir

28 / 30

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

The brakes will grab and the vehicle stops abruptly

Effective braking is reduced and brake lag time is increased

A total brake failure

Parts of the brakes fall away

29 / 30

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

To the air dryer

Past the one-way check valve

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

Past the low-pressure indicators

30 / 30

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

A metal wall

A port

Nothing

A flexible diaphragm

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Air Brake Practice Test 02

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