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

Where would an air dryer be installed?

Between the compressor and the wet reservoir

Next to the governor

Below the foot valve

Next to the two-way valve

2 / 30

What is another name for the supply reservoir?

Main reservoir

Wet reservoir

Maximum reservoir

Primary reservoir

3 / 30

How often should the tanks be drained?

Every 48 hours

Daily

When a problem occurs

Weekly

4 / 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

5 / 30

What does a slack adjuster do?

The lengthens the slack in the air hoses

None of these

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 is another name for an automatic reservoir drain valve?

Major drain valve

Drip valve

Master valve

Spitter valve

7 / 30

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

Into the atmosphere

None of these

Back into the tanks

Into the brake chambers

8 / 30

What gets formed in the bottom of the supply reservoir?

Nothing

Sludge

Flakes

Rust

9 / 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 air filter is plugged or if the belt is slipping

If the two-way valve is closed

10 / 30

How id the push rod connected to the slack adjuster?

By a clevis and pin

By a slack bolt

By a mounting bolt

By a lock screw

11 / 30

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

Worm gear

Slack adjuster

Worm shaft

Spline

12 / 30

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

Front are longer

Rear are smaller

Front are smaller

Rear are longer

13 / 30

What happens if the safety valve has to relieve pressure?

There is a leak with an air hose

The governor or compressor requires adjustment, service or repair

The two-way valve needs adjustment

The brake chamber needs repair

14 / 30

A safety valve is normally set at what psi?

150 psi

135 psi

120 psi

170 psi

15 / 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

16 / 30

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

A metal wall

A flexible diaphragm

A port

Nothing

17 / 30

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

The vehicle quickly stops

The warning buzzer goes off

A total loss of brakes

It reduces the effectiveness of the brake chamber

18 / 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

19 / 30

What compresses the air in the cylinder?

The drive belts

The governor

None of these

The upward motion of the piston

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

Parts of the brakes fall away

A total brake failure

The brakes will grab and the vehicle stops abruptly

Effective braking is reduced and brake lag time is increased

22 / 30

What is the purpose of an air dryer?

To dry the slack adjuster

To dry the brake drums

To reduce the amount of moisture in the system

To dry the brake pads

23 / 30

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

4 minutes

2 minutes

3 minutes

5 minutes

24 / 30

What happens in the reservoir when the heated air cools?

Nothing

The air shrinks

It forms condensation

The air expands

25 / 30

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

To the air dryer

Past the one-way check valve

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

Past the low-pressure indicators

26 / 30

What does a safety valve do?

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

It protects reservoirs from becoming over pressurized and bursting if the governor malfunctioned and did not place the compressor in the unloading stage

27 / 30

What are the primary and secondary reservoirs also known as?

Minimal reservoir

Wet reservoir

Minor reservoir

Dry reservoir

28 / 30

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

Yes

Only if a warning light on the dashboard illuminates

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

29 / 30

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

The number of brake chambers and their size

The type of vehicle

The size of compressor

Whether the tractor will be towing trailers

30 / 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

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Air Brake Practice Test 02

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