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

How often should the tanks be drained?

Daily

Weekly

When a problem occurs

Every 48 hours

2 / 30

What gets formed in the bottom of the supply reservoir?

Sludge

Nothing

Flakes

Rust

3 / 30

What does a safety valve do?

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

It cuts off the governor when it begins to overwork

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

4 / 30

A safety valve is normally set at what psi?

120 psi

135 psi

150 psi

170 psi

5 / 30

What are the primary and secondary reservoirs also known as?

Dry reservoir

Minimal reservoir

Wet reservoir

Minor reservoir

6 / 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

7 / 30

What happens if the safety valve has to relieve pressure?

The governor or compressor requires adjustment, service or repair

There is a leak with an air hose

The brake chamber needs repair

The two-way valve needs adjustment

8 / 30

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

The warning buzzer goes off

A total loss of brakes

The vehicle quickly stops

It reduces the effectiveness of the brake chamber

9 / 30

A brake chamber is usually mounted where?

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

By the differential

In the wheel hub

Above the wheel that is equipped for braking

10 / 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

11 / 30

Where would an air dryer be installed?

Next to the two-way valve

Next to the governor

Between the compressor and the wet reservoir

Below the foot valve

12 / 30

What is another name for the supply reservoir?

Main reservoir

Primary reservoir

Maximum reservoir

Wet reservoir

13 / 30

What is meant by the loading stage?

When the system pressure reaches its maximum

When the system pressure reaches its minimum

When the air is being added to the reservoir

When the air is being pushed through the air hoses

14 / 30

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

Back into the tanks

Into the atmosphere

None of these

Into the brake chambers

15 / 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 reduces the amount of compressed air allowable

It adds additional weight to the system

16 / 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 one-way check valve

Past the low-pressure indicators

17 / 30

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

A metal wall

A port

A flexible diaphragm

Nothing

18 / 30

What does a slack adjuster do?

None of these

It creates a slack when the brakes are malfunctioning

The lengthens the slack in the air hoses

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

19 / 30

What happens in the reservoir when the heated air cools?

The air expands

It forms condensation

Nothing

The air shrinks

20 / 30

What compresses the air in the cylinder?

The drive belts

The governor

The upward motion of the piston

None of these

21 / 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 two-way valve is closed

If the reservoir is full

If the governor has stopped

22 / 30

How id the push rod connected to the slack adjuster?

By a clevis and pin

By a mounting bolt

By a slack bolt

By a lock screw

23 / 30

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

4 minutes

5 minutes

2 minutes

3 minutes

24 / 30

What is another name for an automatic reservoir drain valve?

Spitter valve

Drip valve

Master valve

Major drain valve

25 / 30

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

Rear are longer

Front are smaller

Rear are smaller

Front are longer

26 / 30

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

Spline

Worm gear

Slack adjuster

Worm shaft

27 / 30

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

It prevents the moisture from freezing in cold climate operation

It helps to keep the air hoses flexible

It warms the air coming from the supply tank

None of these

28 / 30

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

Whether the tractor will be towing trailers

The type of vehicle

The number of brake chambers and their size

The size of compressor

29 / 30

What is the purpose of an air dryer?

To dry the brake drums

To dry the brake pads

To dry the slack adjuster

To reduce the amount of moisture in the system

30 / 30

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

Parts of the brakes fall away

Effective braking is reduced and brake lag time is increased

A total brake failure

The brakes will grab and the vehicle stops abruptly

Your score is

Air Brake Practice Test 02

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