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

A metal wall

Nothing

A port

A flexible diaphragm

2 / 30

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

5 minutes

3 minutes

2 minutes

4 minutes

3 / 30

How often should the tanks be drained?

Every 48 hours

Daily

When a problem occurs

Weekly

4 / 30

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

The type of vehicle

Whether the tractor will be towing trailers

The size of compressor

The number of brake chambers and their size

5 / 30

How id the push rod connected to the slack adjuster?

By a mounting bolt

By a clevis and pin

By a lock screw

By a slack bolt

6 / 30

What are the primary and secondary reservoirs also known as?

Minor reservoir

Minimal reservoir

Wet reservoir

Dry 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 is another name for an automatic reservoir drain valve?

Drip valve

Spitter valve

Master valve

Major drain valve

9 / 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

10 / 30

What is meant by the loading stage?

When the system pressure reaches its maximum

When the air is being added to the reservoir

When the system pressure reaches its minimum

When the air is being pushed through the air hoses

11 / 30

What compresses the air in the cylinder?

The drive belts

The upward motion of the piston

The governor

None of these

12 / 30

What would stop a compressor to not be able to build air pressure rom 50 to 90 psi within three minutes?

If the governor has stopped

If the reservoir is full

If the two-way valve is closed

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

13 / 30

Where would an air dryer be installed?

Between the compressor and the wet reservoir

Next to the governor

Below the foot valve

Next to the two-way valve

14 / 30

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

They are spring loaded

The are stiffer

None of these

The pedal is thicker

15 / 30

What gets formed in the bottom of the supply reservoir?

Nothing

Rust

Sludge

Flakes

16 / 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

17 / 30

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

None of these

Into the atmosphere

Back into the tanks

Into the brake chambers

18 / 30

What does a slack adjuster do?

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

The lengthens the slack in the air hoses

19 / 30

If a leak occurs in the diaphragm, air is allowed to escape causing what to happen?

A total loss of brakes

It reduces the effectiveness of the brake chamber

The vehicle quickly stops

The warning buzzer goes off

20 / 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

21 / 30

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

Worm shaft

Slack adjuster

Spline

Worm gear

22 / 30

What is another name for the supply reservoir?

Primary reservoir

Maximum reservoir

Wet reservoir

Main reservoir

23 / 30

A safety valve is normally set at what psi?

170 psi

150 psi

135 psi

120 psi

24 / 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

25 / 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

26 / 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 protects the compressor from over-loading the system

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

27 / 30

What happens if the safety valve has to relieve pressure?

The brake chamber needs repair

The two-way valve needs adjustment

The governor or compressor requires adjustment, service or repair

There is a leak with an air hose

28 / 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

29 / 30

What happens in the reservoir when the heated air cools?

It forms condensation

The air shrinks

Nothing

The air expands

30 / 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

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Air Brake Practice Test 02

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