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 warning buzzer goes off

The vehicle quickly stops

It reduces the effectiveness of the brake chamber

A total loss of brakes

2 / 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

3 / 30

What is the purpose of an air dryer?

To dry the brake pads

To dry the brake drums

To reduce the amount of moisture in the system

To dry the slack adjuster

4 / 30

What does a safety valve do?

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

It protects the compressor from over-loading the system

5 / 30

What happens in the reservoir when the heated air cools?

The air shrinks

It forms condensation

The air expands

Nothing

6 / 30

How id the push rod connected to the slack adjuster?

By a clevis and pin

By a slack bolt

By a lock screw

By a mounting bolt

7 / 30

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

Front are smaller

Front are longer

Rear are smaller

Rear are longer

8 / 30

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

2 minutes

3 minutes

5 minutes

4 minutes

9 / 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

10 / 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 low-pressure indicators

Past the one-way check valve

11 / 30

What compresses the air in the cylinder?

The governor

The upward motion of the piston

None of these

The drive belts

12 / 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

13 / 30

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

The pedal is thicker

None of these

The are stiffer

They are spring loaded

14 / 30

How often should the tanks be drained?

Weekly

When a problem occurs

Daily

Every 48 hours

15 / 30

What is another name for the supply reservoir?

Wet reservoir

Main reservoir

Primary reservoir

Maximum reservoir

16 / 30

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

It adds additional weight to the system

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

It reduces the amount of compressed air allowable

It slows down the forced air

17 / 30

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

Only if a warning light on the dashboard illuminates

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

Yes

18 / 30

What is another name for an automatic reservoir drain valve?

Master valve

Drip valve

Spitter valve

Major drain valve

19 / 30

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

None of these

Into the brake chambers

Into the atmosphere

Back into the tanks

20 / 30

What are the primary and secondary reservoirs also known as?

Dry reservoir

Minor reservoir

Wet reservoir

Minimal reservoir

21 / 30

A safety valve is normally set at what psi?

170 psi

135 psi

150 psi

120 psi

22 / 30

What gets formed in the bottom of the supply reservoir?

Rust

Sludge

Flakes

Nothing

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 air filter is plugged or if the belt is slipping

If the reservoir is full

If the two-way valve is closed

If the governor has stopped

24 / 30

What happens if the safety valve has to relieve pressure?

The governor or compressor requires adjustment, service or repair

There is a leak with an air hose

The two-way valve needs adjustment

The brake chamber needs repair

25 / 30

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

The size of compressor

The type of vehicle

Whether the tractor will be towing trailers

The number of brake chambers and their size

26 / 30

Where would an air dryer be installed?

Next to the governor

Next to the two-way valve

Between the compressor and the wet reservoir

Below the foot valve

27 / 30

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

None of these

It prevents the moisture from freezing in cold climate operation

It warms the air coming from the supply tank

It helps to keep the air hoses flexible

28 / 30

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

Worm gear

Spline

Slack adjuster

Worm shaft

29 / 30

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

A flexible diaphragm

A metal wall

A port

Nothing

30 / 30

A brake chamber is usually mounted where?

Above the wheel that is equipped for braking

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

By the differential

In the wheel hub

Your score is

Air Brake Practice Test 02

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