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 safety valve is normally set at what psi?

170 psi

135 psi

150 psi

120 psi

2 / 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 prevents the moisture from freezing in cold climate operation

It warms the air coming from the supply tank

3 / 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 cuts off the governor when it begins to overwork

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

It protects the compressor from over-loading the system

4 / 30

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

Slack adjuster

Worm shaft

Worm gear

Spline

5 / 30

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

It slows down the forced air

It adds additional weight to the system

It reduces the amount of compressed air allowable

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

6 / 30

How id the push rod connected to the slack adjuster?

By a mounting bolt

By a lock screw

By a slack bolt

By a clevis and pin

7 / 30

What is the purpose of an air dryer?

To reduce the amount of moisture in the system

To dry the brake pads

To dry the slack adjuster

To dry the brake drums

8 / 30

What happens in the reservoir when the heated air cools?

The air expands

Nothing

The air shrinks

It forms condensation

9 / 30

What is meant by the loading stage?

When the air is being pushed through the air hoses

When the system pressure reaches its maximum

When the air is being added to the reservoir

When the system pressure reaches its minimum

10 / 30

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

Effective braking is reduced and brake lag time is increased

Parts of the brakes fall away

A total brake failure

The brakes will grab and the vehicle stops abruptly

11 / 30

What compresses the air in the cylinder?

The governor

The upward motion of the piston

The drive belts

None of these

12 / 30

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

The pedal is thicker

The are stiffer

None of these

They are spring loaded

13 / 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

14 / 30

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

3 minutes

5 minutes

4 minutes

2 minutes

15 / 30

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

Into the brake chambers

Back into the tanks

None of these

Into the atmosphere

16 / 30

What gets formed in the bottom of the supply reservoir?

Nothing

Rust

Flakes

Sludge

17 / 30

What is another name for the supply reservoir?

Primary reservoir

Maximum reservoir

Wet reservoir

Main reservoir

18 / 30

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

A port

Nothing

A flexible diaphragm

A metal wall

19 / 30

What does a slack adjuster do?

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

None of these

The lengthens the slack in the air hoses

20 / 30

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

Past the low-pressure indicators

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

To the air dryer

Past the one-way check valve

21 / 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

22 / 30

What is another name for an automatic reservoir drain valve?

Drip valve

Master valve

Spitter valve

Major drain valve

23 / 30

Where would an air dryer be installed?

Between the compressor and the wet reservoir

Next to the two-way valve

Below the foot valve

Next to the governor

24 / 30

A brake chamber is usually mounted where?

Above the wheel that is equipped for braking

By the differential

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

In the wheel hub

25 / 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

26 / 30

What happens if the safety valve has to relieve pressure?

The governor or compressor requires adjustment, service or repair

The brake chamber needs repair

The two-way valve needs adjustment

There is a leak with an air hose

27 / 30

How often should the tanks be drained?

Daily

Weekly

When a problem occurs

Every 48 hours

28 / 30

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

The number of brake chambers and their size

The type of vehicle

Whether the tractor will be towing trailers

The size of compressor

29 / 30

What are the primary and secondary reservoirs also known as?

Dry reservoir

Minor reservoir

Minimal reservoir

Wet reservoir

30 / 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 reservoir is full

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

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Air Brake Practice Test 02

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