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

What happens in the reservoir when the heated air cools?

Nothing

The air shrinks

The air expands

It forms condensation

2 / 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

3 / 30

What are the primary and secondary reservoirs also known as?

Dry reservoir

Minimal reservoir

Minor reservoir

Wet reservoir

4 / 30

How id the push rod connected to the slack adjuster?

By a slack bolt

By a mounting bolt

By a lock screw

By a clevis and pin

5 / 30

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

Front are longer

Front are smaller

Rear are longer

Rear are smaller

6 / 30

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

It warms the air coming from the supply tank

It prevents the moisture from freezing in cold climate operation

None of these

It helps to keep the air hoses flexible

7 / 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 stops the air flow from the compressor to the supply tank

It protects reservoirs from becoming over pressurized and bursting if the governor malfunctioned and did not place the compressor in the unloading stage

8 / 30

What is another name for the supply reservoir?

Main reservoir

Primary reservoir

Maximum reservoir

Wet reservoir

9 / 30

What does a slack adjuster do?

The lengthens the slack in the air hoses

It creates a slack when the brakes are malfunctioning

None of these

It adjusts the 'slack' or free play in the linkage between the push rod and the brake shoes

10 / 30

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

4 minutes

2 minutes

5 minutes

3 minutes

11 / 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

12 / 30

What is meant by the loading stage?

When the system pressure reaches its maximum

When the system pressure reaches its minimum

When the air is being pushed through the air hoses

When the air is being added to the reservoir

13 / 30

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

A port

A metal wall

A flexible diaphragm

Nothing

14 / 30

What is the purpose of an air dryer?

To dry the brake drums

To dry the brake pads

To dry the slack adjuster

To reduce the amount of moisture in the system

15 / 30

What happens if the safety valve has to relieve pressure?

The brake chamber needs repair

The two-way valve needs adjustment

There is a leak with an air hose

The governor or compressor requires adjustment, service or repair

16 / 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 adds additional weight to the system

It reduces the amount of compressed air allowable

17 / 30

What compresses the air in the cylinder?

The drive belts

None of these

The upward motion of the piston

The governor

18 / 30

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

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

Only if a warning light on the dashboard illuminates

Yes

19 / 30

Where would an air dryer be installed?

Next to the governor

Between the compressor and the wet reservoir

Next to the two-way valve

Below the foot valve

20 / 30

What is another name for an automatic reservoir drain valve?

Drip valve

Major drain valve

Master valve

Spitter valve

21 / 30

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

Spline

Worm gear

Slack adjuster

Worm shaft

22 / 30

How often should the tanks be drained?

Daily

When a problem occurs

Every 48 hours

Weekly

23 / 30

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

The pedal is thicker

They are spring loaded

The are stiffer

None of these

24 / 30

A safety valve is normally set at what psi?

120 psi

135 psi

150 psi

170 psi

25 / 30

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

The brakes will grab and the vehicle stops abruptly

A total brake failure

Effective braking is reduced and brake lag time is increased

Parts of the brakes fall away

26 / 30

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

Back into the tanks

Into the brake chambers

None of these

Into the atmosphere

27 / 30

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

Past the one-way check valve

Past the low-pressure indicators

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

To the air dryer

28 / 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

In the wheel hub

By the differential

29 / 30

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

The number of brake chambers and their size

Whether the tractor will be towing trailers

The type of vehicle

The size of compressor

30 / 30

What gets formed in the bottom of the supply reservoir?

Flakes

Nothing

Rust

Sludge

Your score is

Air Brake Practice Test 02

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