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

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

None of these

The are stiffer

The pedal is thicker

They are spring loaded

2 / 30

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

Into the atmosphere

Into the brake chambers

None of these

Back into the tanks

3 / 30

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

It reduces the amount of compressed air allowable

It slows down the forced air

It adds additional weight to the system

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

4 / 30

A safety valve is normally set at what psi?

150 psi

135 psi

120 psi

170 psi

5 / 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

6 / 30

What gets formed in the bottom of the supply reservoir?

Sludge

Rust

Flakes

Nothing

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

It cuts off the governor when it begins to overwork

It protects the compressor from over-loading the system

8 / 30

What is meant by the loading stage?

When the air is being added to the reservoir

When the system pressure reaches its maximum

When the air is being pushed through the air hoses

When the system pressure reaches its minimum

9 / 30

What happens in the reservoir when the heated air cools?

The air expands

The air shrinks

It forms condensation

Nothing

10 / 30

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

Past the low-pressure indicators

To the air dryer

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

Past the one-way check valve

11 / 30

What is another name for the supply reservoir?

Main reservoir

Wet reservoir

Primary reservoir

Maximum reservoir

12 / 30

Where would an air dryer be installed?

Below the foot valve

Next to the two-way valve

Between the compressor and the wet reservoir

Next to the governor

13 / 30

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

Front are smaller

Front are longer

Rear are longer

Rear are smaller

14 / 30

What compresses the air in the cylinder?

The drive belts

The upward motion of the piston

The governor

None of these

15 / 30

What are the primary and secondary reservoirs also known as?

Dry reservoir

Minimal reservoir

Wet reservoir

Minor reservoir

16 / 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

17 / 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

18 / 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

19 / 30

What is another name for an automatic reservoir drain valve?

Major drain valve

Spitter valve

Drip valve

Master valve

20 / 30

How id the push rod connected to the slack adjuster?

By a clevis and pin

By a slack bolt

By a mounting bolt

By a lock screw

21 / 30

What happens if the safety valve has to relieve pressure?

The two-way valve needs adjustment

There is a leak with an air hose

The governor or compressor requires adjustment, service or repair

The brake chamber needs repair

22 / 30

How often should the tanks be drained?

Every 48 hours

Weekly

Daily

When a problem occurs

23 / 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

24 / 30

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

Worm gear

Spline

Slack adjuster

Worm shaft

25 / 30

What does a slack adjuster do?

None of these

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

It creates a slack when the brakes are malfunctioning

The lengthens the slack in the air hoses

26 / 30

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

A flexible diaphragm

Nothing

A metal wall

A port

27 / 30

A brake chamber is usually mounted where?

In the wheel hub

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

Above the wheel that is equipped for braking

By the differential

28 / 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

29 / 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

Parts of the brakes fall away

Effective braking is reduced and brake lag time is increased

30 / 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

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Air Brake Practice Test 02

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