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 gets formed in the bottom of the supply reservoir?

Nothing

Sludge

Rust

Flakes

2 / 30

What happens if the safety valve has to relieve pressure?

There is a leak with an air hose

The brake chamber needs repair

The two-way valve needs adjustment

The governor or compressor requires adjustment, service or repair

3 / 30

How often should the tanks be drained?

Weekly

Daily

Every 48 hours

When a problem occurs

4 / 30

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

The vehicle quickly stops

A total loss of brakes

It reduces the effectiveness of the brake chamber

The warning buzzer goes off

5 / 30

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

Spline

Slack adjuster

Worm shaft

Worm gear

6 / 30

What compresses the air in the cylinder?

None of these

The drive belts

The upward motion of the piston

The governor

7 / 30

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

Front are longer

Rear are smaller

Rear are longer

Front are smaller

8 / 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

9 / 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 reduces the amount of compressed air allowable

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

10 / 30

A safety valve is normally set at what psi?

135 psi

120 psi

150 psi

170 psi

11 / 30

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

3 minutes

5 minutes

2 minutes

4 minutes

12 / 30

What is the purpose of an air dryer?

To dry the brake pads

To dry the slack adjuster

To reduce the amount of moisture in the system

To dry the brake drums

13 / 30

What is another name for an automatic reservoir drain valve?

Master valve

Drip valve

Major drain valve

Spitter valve

14 / 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

15 / 30

How id the push rod connected to the slack adjuster?

By a clevis and pin

By a slack bolt

By a lock screw

By a mounting bolt

16 / 30

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

Back into the tanks

Into the brake chambers

Into the atmosphere

None of these

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 two-way valve is closed

If the reservoir is full

If the governor has stopped

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

18 / 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 low-pressure indicators

To the air dryer

Past the one-way check valve

19 / 30

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

The are stiffer

None of these

The pedal is thicker

They are spring loaded

20 / 30

What are the primary and secondary reservoirs also known as?

Dry reservoir

Minimal reservoir

Minor reservoir

Wet reservoir

21 / 30

What is another name for the supply reservoir?

Wet reservoir

Main reservoir

Maximum reservoir

Primary reservoir

22 / 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 protects the compressor from over-loading the system

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

It cuts off the governor when it begins to overwork

23 / 30

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

It helps to keep the air hoses flexible

None of these

It prevents the moisture from freezing in cold climate operation

It warms the air coming from the supply tank

24 / 30

What does a slack adjuster do?

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

It creates a slack when the brakes are malfunctioning

25 / 30

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

Nothing

A port

A flexible diaphragm

A metal wall

26 / 30

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

A total brake failure

The brakes will grab and the vehicle stops abruptly

Parts of the brakes fall away

Effective braking is reduced and brake lag time is increased

27 / 30

Where would an air dryer be installed?

Next to the governor

Below the foot valve

Next to the two-way valve

Between the compressor and the wet reservoir

28 / 30

What happens in the reservoir when the heated air cools?

The air shrinks

It forms condensation

The air expands

Nothing

29 / 30

What is meant by the loading stage?

When the system pressure reaches its minimum

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

30 / 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

Your score is

Air Brake Practice Test 02

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