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 compresses the air in the cylinder?

The drive belts

The governor

The upward motion of the piston

None of these

2 / 30

What is another name for the supply reservoir?

Main reservoir

Primary reservoir

Maximum reservoir

Wet reservoir

3 / 30

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

If the reservoir is full

If the two-way valve is closed

If the governor has stopped

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

4 / 30

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

3 minutes

4 minutes

5 minutes

2 minutes

5 / 30

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

Worm shaft

Worm gear

Slack adjuster

Spline

6 / 30

A safety valve is normally set at what psi?

120 psi

135 psi

170 psi

150 psi

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

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

A metal wall

Nothing

A flexible diaphragm

A port

9 / 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

It helps to keep the air hoses flexible

None of these

10 / 30

What does a safety valve do?

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

It cuts off the governor when it begins to overwork

It protects the compressor from over-loading the system

11 / 30

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

A total loss of brakes

The warning buzzer goes off

It reduces the effectiveness of the brake chamber

The vehicle quickly stops

12 / 30

What are the primary and secondary reservoirs also known as?

Wet reservoir

Minor reservoir

Dry reservoir

Minimal reservoir

13 / 30

How often should the tanks be drained?

Daily

Every 48 hours

When a problem occurs

Weekly

14 / 30

What happens in the reservoir when the heated air cools?

The air expands

It forms condensation

The air shrinks

Nothing

15 / 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 slows down the forced air

It reduces the amount of compressed air allowable

16 / 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

Whether the tractor will be towing trailers

The size of compressor

17 / 30

What gets formed in the bottom of the supply reservoir?

Flakes

Nothing

Sludge

Rust

18 / 30

What is another name for an automatic reservoir drain valve?

Major drain valve

Master valve

Drip valve

Spitter valve

19 / 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

20 / 30

What does a slack adjuster do?

The lengthens the slack in the air hoses

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

21 / 30

How id the push rod connected to the slack adjuster?

By a slack bolt

By a clevis and pin

By a mounting bolt

By a lock screw

22 / 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

23 / 30

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

To the air dryer

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

Past the one-way check valve

Past the low-pressure indicators

24 / 30

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

A total brake failure

Effective braking is reduced and brake lag time is increased

The brakes will grab and the vehicle stops abruptly

Parts of the brakes fall away

25 / 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

26 / 30

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

None of these

Back into the tanks

Into the atmosphere

Into the brake chambers

27 / 30

What happens if the safety valve has to relieve pressure?

The two-way valve needs adjustment

The governor or compressor requires adjustment, service or repair

The brake chamber needs repair

There is a leak with an air hose

28 / 30

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

The pedal is thicker

The are stiffer

They are spring loaded

None of these

29 / 30

A brake chamber is usually mounted where?

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

Above the wheel that is equipped for braking

By the differential

In the wheel hub

30 / 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

Your score is

Air Brake Practice Test 02

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