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?

170 psi

150 psi

120 psi

135 psi

2 / 30

Where would an air dryer be installed?

Between the compressor and the wet reservoir

Next to the two-way valve

Next to the governor

Below the foot valve

3 / 30

What compresses the air in the cylinder?

None of these

The upward motion of the piston

The governor

The drive belts

4 / 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

5 / 30

How id the push rod connected to the slack adjuster?

By a lock screw

By a mounting bolt

By a slack bolt

By a clevis and pin

6 / 30

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

Front are longer

Rear are longer

Front are smaller

Rear are smaller

7 / 30

What is the purpose of an air dryer?

To reduce the amount of moisture in the system

To dry the brake drums

To dry the brake pads

To dry the slack adjuster

8 / 30

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

Into the brake chambers

Back into the tanks

None of these

Into the atmosphere

9 / 30

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

Slack adjuster

Spline

Worm shaft

Worm gear

10 / 30

How often should the tanks be drained?

Weekly

When a problem occurs

Every 48 hours

Daily

11 / 30

What is another name for the supply reservoir?

Wet reservoir

Main reservoir

Maximum reservoir

Primary reservoir

12 / 30

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

Nothing

A metal wall

A port

A flexible diaphragm

13 / 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 reduces the amount of compressed air allowable

It slows down the forced air

It adds additional weight to the system

14 / 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

15 / 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

16 / 30

What happens in the reservoir when the heated air cools?

Nothing

The air shrinks

It forms condensation

The air expands

17 / 30

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

5 minutes

4 minutes

2 minutes

3 minutes

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

A brake chamber is usually mounted where?

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

In the wheel hub

By the differential

Above the wheel that is equipped for braking

20 / 30

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

The are stiffer

They are spring loaded

The pedal is thicker

None of these

21 / 30

What is another name for an automatic reservoir drain valve?

Spitter valve

Drip valve

Major drain valve

Master valve

22 / 30

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

It warms the air coming from the supply tank

None of these

It prevents the moisture from freezing in cold climate operation

It helps to keep the air hoses flexible

23 / 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

24 / 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

It reduces the effectiveness of the brake chamber

A total loss of brakes

25 / 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

26 / 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 reservoir is full

If the two-way valve is closed

If the governor has stopped

27 / 30

What gets formed in the bottom of the supply reservoir?

Nothing

Flakes

Sludge

Rust

28 / 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

29 / 30

What are the primary and secondary reservoirs also known as?

Wet reservoir

Minimal reservoir

Minor reservoir

Dry reservoir

30 / 30

What is meant by the loading stage?

When the air is being added to the reservoir

When the system pressure reaches its maximum

When the system pressure reaches its minimum

When the air is being pushed through the air hoses

Your score is

Air Brake Practice Test 02

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