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

A safety valve is normally set at what psi?

150 psi

170 psi

120 psi

135 psi

2 / 30

What happens if the safety valve has to relieve pressure?

The governor or compressor requires adjustment, service or repair

The two-way valve needs adjustment

The brake chamber needs repair

There is a leak with an air hose

3 / 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 brake drums

To dry the slack adjuster

4 / 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

None of these

It prevents the moisture from freezing in cold climate operation

5 / 30

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

If the governor has stopped

If the two-way valve is closed

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

If the reservoir is full

6 / 30

What is meant by the loading stage?

When the system pressure reaches its minimum

When the air is being pushed through the air hoses

When the system pressure reaches its maximum

When the air is being added to the reservoir

7 / 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

By the differential

Above the wheel that is equipped for braking

8 / 30

What happens in the reservoir when the heated air cools?

The air shrinks

It forms condensation

Nothing

The air expands

9 / 30

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

Front are longer

Front are smaller

Rear are smaller

Rear are longer

10 / 30

How often should the tanks be drained?

Weekly

Every 48 hours

Daily

When a problem occurs

11 / 30

What compresses the air in the cylinder?

The governor

None of these

The upward motion of the piston

The drive belts

12 / 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

13 / 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

The vehicle quickly stops

A total loss of brakes

The warning buzzer goes off

14 / 30

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

A flexible diaphragm

A metal wall

A port

Nothing

15 / 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

None of these

It creates a slack when the brakes are malfunctioning

The lengthens the slack in the air hoses

16 / 30

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

Parts of the brakes fall away

The brakes will grab and the vehicle stops abruptly

Effective braking is reduced and brake lag time is increased

A total brake failure

17 / 30

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

It reduces the amount of compressed air allowable

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

18 / 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

19 / 30

How id the push rod connected to the slack adjuster?

By a mounting bolt

By a clevis and pin

By a slack bolt

By a lock screw

20 / 30

Do automatic reservoir drain valves still need to be checked daily?

Only if a warning light on the dashboard illuminates

Yes

Only if there is too much of a lag in the braking

21 / 30

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

5 minutes

4 minutes

3 minutes

2 minutes

22 / 30

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

Into the brake chambers

None of these

Back into the tanks

Into the atmosphere

23 / 30

What gets formed in the bottom of the supply reservoir?

Flakes

Nothing

Sludge

Rust

24 / 30

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

Worm shaft

Slack adjuster

Spline

Worm gear

25 / 30

What is another name for the supply reservoir?

Main reservoir

Maximum reservoir

Wet reservoir

Primary reservoir

26 / 30

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

Past the one-way check valve

To the air dryer

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

Past the low-pressure indicators

27 / 30

What is another name for an automatic reservoir drain valve?

Drip valve

Master valve

Spitter valve

Major drain valve

28 / 30

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

They are spring loaded

The pedal is thicker

The are stiffer

None of these

29 / 30

What are the primary and secondary reservoirs also known as?

Wet reservoir

Minor reservoir

Minimal reservoir

Dry reservoir

30 / 30

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

The number of brake chambers and their size

Whether the tractor will be towing trailers

The size of compressor

The type of vehicle

Your score is

Air Brake Practice Test 02

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