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

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

2 / 30

A safety valve is normally set at what psi?

135 psi

170 psi

150 psi

120 psi

3 / 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

4 / 30

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

Whether the tractor will be towing trailers

The number of brake chambers and their size

The type of vehicle

The size of compressor

5 / 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

6 / 30

What happens in the reservoir when the heated air cools?

It forms condensation

Nothing

The air shrinks

The air expands

7 / 30

What is another name for the supply reservoir?

Maximum reservoir

Main reservoir

Primary reservoir

Wet reservoir

8 / 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

9 / 30

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

It reduces the effectiveness of the brake chamber

A total loss of brakes

The warning buzzer goes off

The vehicle quickly stops

10 / 30

How id the push rod connected to the slack adjuster?

By a mounting bolt

By a lock screw

By a clevis and pin

By a slack bolt

11 / 30

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

5 minutes

2 minutes

4 minutes

3 minutes

12 / 30

What gets formed in the bottom of the supply reservoir?

Flakes

Nothing

Rust

Sludge

13 / 30

What are the primary and secondary reservoirs also known as?

Wet reservoir

Minor reservoir

Minimal reservoir

Dry reservoir

14 / 30

What compresses the air in the cylinder?

The drive belts

The governor

The upward motion of the piston

None of these

15 / 30

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

A flexible diaphragm

A metal wall

Nothing

A port

16 / 30

Where would an air dryer be installed?

Next to the governor

Below the foot valve

Between the compressor and the wet reservoir

Next to the two-way valve

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 governor has stopped

If the two-way valve is closed

18 / 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

19 / 30

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

Rear are longer

Front are smaller

Front are longer

Rear are smaller

20 / 30

What is meant by the loading stage?

When the system pressure reaches its maximum

When the air is being pushed through the air hoses

When the system pressure reaches its minimum

When the air is being added to the reservoir

21 / 30

What happens if the safety valve has to relieve pressure?

The brake chamber needs repair

There is a leak with an air hose

The two-way valve needs adjustment

The governor or compressor requires adjustment, service or repair

22 / 30

What is another name for an automatic reservoir drain valve?

Master valve

Spitter valve

Drip valve

Major drain valve

23 / 30

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

It helps to keep the air hoses flexible

It warms the air coming from the supply tank

It prevents the moisture from freezing in cold climate operation

None of these

24 / 30

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

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

It reduces the amount of compressed air allowable

25 / 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

26 / 30

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

A total brake failure

Parts of the brakes fall away

Effective braking is reduced and brake lag time is increased

The brakes will grab and the vehicle stops abruptly

27 / 30

How often should the tanks be drained?

Every 48 hours

When a problem occurs

Daily

Weekly

28 / 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

Past the one-way check valve

Past the low-pressure indicators

To the air dryer

29 / 30

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

Worm shaft

Slack adjuster

Worm gear

Spline

30 / 30

A brake chamber is usually mounted where?

In the wheel hub

By the differential

Above the wheel that is equipped for braking

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

Your score is

Air Brake Practice Test 02

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