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 does a safety valve do?

It protects the compressor from over-loading the system

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 stops the air flow from the compressor to the supply tank

2 / 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

3 / 30

What is meant by the loading stage?

When the system pressure reaches its maximum

When the air is being added to the reservoir

When the system pressure reaches its minimum

When the air is being pushed through the air hoses

4 / 30

A safety valve is normally set at what psi?

135 psi

120 psi

150 psi

170 psi

5 / 30

What does a slack adjuster do?

None of these

The lengthens the slack in the air hoses

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

6 / 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 reservoir is full

If the two-way valve is closed

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

7 / 30

What gets formed in the bottom of the supply reservoir?

Sludge

Rust

Flakes

Nothing

8 / 30

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

A total loss of brakes

It reduces the effectiveness of the brake chamber

The vehicle quickly stops

The warning buzzer goes off

9 / 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

10 / 30

How often should the tanks be drained?

Daily

Weekly

When a problem occurs

Every 48 hours

11 / 30

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

Spline

Worm shaft

Slack adjuster

Worm gear

12 / 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

13 / 30

What happens in the reservoir when the heated air cools?

It forms condensation

Nothing

The air shrinks

The air expands

14 / 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 governor or compressor requires adjustment, service or repair

The two-way valve needs adjustment

15 / 30

Where would an air dryer be installed?

Next to the two-way valve

Next to the governor

Below the foot valve

Between the compressor and the wet reservoir

16 / 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

17 / 30

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

The type of vehicle

The size of compressor

Whether the tractor will be towing trailers

The number of brake chambers and their size

18 / 30

What is another name for the supply reservoir?

Maximum reservoir

Main reservoir

Wet reservoir

Primary reservoir

19 / 30

How id the push rod connected to the slack adjuster?

By a lock screw

By a slack bolt

By a mounting bolt

By a clevis and pin

20 / 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

Above the wheel that is equipped for braking

By the differential

21 / 30

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

Front are smaller

Rear are longer

Front are longer

Rear are smaller

22 / 30

What compresses the air in the cylinder?

The drive belts

The upward motion of the piston

The governor

None of these

23 / 30

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

It adds additional weight to the system

It slows down the forced air

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

It reduces the amount of compressed air allowable

24 / 30

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

2 minutes

4 minutes

3 minutes

5 minutes

25 / 30

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

A flexible diaphragm

Nothing

A metal wall

A port

26 / 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

27 / 30

What is the purpose of an air dryer?

To dry the slack adjuster

To reduce the amount of moisture in the system

To dry the brake pads

To dry the brake drums

28 / 30

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

The brakes will grab and the vehicle stops abruptly

Parts of the brakes fall away

A total brake failure

Effective braking is reduced and brake lag time is increased

29 / 30

What are the primary and secondary reservoirs also known as?

Minimal reservoir

Minor reservoir

Wet reservoir

Dry reservoir

30 / 30

What is another name for an automatic reservoir drain valve?

Drip valve

Major drain valve

Spitter valve

Master valve

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Air Brake Practice Test 02

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