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

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

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 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

3 / 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

4 / 30

A brake chamber is usually mounted where?

By the differential

In the wheel hub

Above the wheel that is equipped for braking

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

5 / 30

What happens in the reservoir when the heated air cools?

The air expands

Nothing

The air shrinks

It forms condensation

6 / 30

What is another name for the supply reservoir?

Wet reservoir

Main reservoir

Maximum reservoir

Primary reservoir

7 / 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

8 / 30

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

Parts of the brakes fall away

The brakes will grab and the vehicle stops abruptly

Effective braking is reduced and brake lag time is increased

A total brake failure

9 / 30

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

Front are longer

Rear are longer

Rear are smaller

Front are smaller

10 / 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

11 / 30

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

Slack adjuster

Worm shaft

Spline

Worm gear

12 / 30

A safety valve is normally set at what psi?

120 psi

170 psi

135 psi

150 psi

13 / 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 system pressure reaches its minimum

When the air is being added to the reservoir

14 / 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

15 / 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

The size of compressor

Whether the tractor will be towing trailers

16 / 30

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

A flexible diaphragm

A port

A metal wall

Nothing

17 / 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

The lengthens the slack in the air hoses

None of these

18 / 30

What compresses the air in the cylinder?

The drive belts

The upward motion of the piston

The governor

None of these

19 / 30

How often should the tanks be drained?

When a problem occurs

Daily

Every 48 hours

Weekly

20 / 30

What does a safety valve do?

It cuts off the governor when it begins to overwork

It protects the compressor from over-loading the system

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

21 / 30

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

They are spring loaded

None of these

The are stiffer

The pedal is thicker

22 / 30

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

It adds additional weight to the system

It reduces the amount of compressed air allowable

It slows down the forced air

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

23 / 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

None of these

It warms the air coming from the supply tank

24 / 30

What is another name for an automatic reservoir drain valve?

Spitter valve

Master valve

Major drain valve

Drip valve

25 / 30

What gets formed in the bottom of the supply reservoir?

Rust

Flakes

Nothing

Sludge

26 / 30

What are the primary and secondary reservoirs also known as?

Wet reservoir

Minor reservoir

Minimal reservoir

Dry reservoir

27 / 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

28 / 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

29 / 30

Where would an air dryer be installed?

Below the foot valve

Next to the two-way valve

Next to the governor

Between the compressor and the wet reservoir

30 / 30

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

4 minutes

3 minutes

2 minutes

5 minutes

Your score is

Air Brake Practice Test 02

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