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

It helps to keep the air hoses flexible

It prevents the moisture from freezing in cold climate operation

It warms the air coming from the supply tank

None of these

2 / 30

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

The brakes will grab and the vehicle stops abruptly

Effective braking is reduced and brake lag time is increased

Parts of the brakes fall away

A total brake failure

3 / 30

What does a slack adjuster do?

None of these

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

The lengthens the slack in the air hoses

It creates a slack when the brakes are malfunctioning

4 / 30

Where would an air dryer be installed?

Between the compressor and the wet reservoir

Next to the governor

Next to the two-way valve

Below the foot valve

5 / 30

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

Into the brake chambers

Into the atmosphere

None of these

Back into the tanks

6 / 30

What gets formed in the bottom of the supply reservoir?

Rust

Nothing

Flakes

Sludge

7 / 30

What compresses the air in the cylinder?

The upward motion of the piston

The drive belts

The governor

None of these

8 / 30

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

Past the one-way check valve

Past the low-pressure indicators

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

To the air dryer

9 / 30

What are the primary and secondary reservoirs also known as?

Dry reservoir

Minor reservoir

Minimal reservoir

Wet reservoir

10 / 30

What happens if the safety valve has to relieve pressure?

The two-way valve needs adjustment

The brake chamber needs repair

The governor or compressor requires adjustment, service or repair

There is a leak with an air hose

11 / 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

12 / 30

What is meant by the loading stage?

When the air is being pushed through the air hoses

When the air is being added to the reservoir

When the system pressure reaches its maximum

When the system pressure reaches its minimum

13 / 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

14 / 30

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

It slows down the forced air

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

15 / 30

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

A port

A metal wall

A flexible diaphragm

Nothing

16 / 30

A safety valve is normally set at what psi?

150 psi

135 psi

120 psi

170 psi

17 / 30

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

Worm gear

Worm shaft

Spline

Slack adjuster

18 / 30

How id the push rod connected to the slack adjuster?

By a slack bolt

By a lock screw

By a clevis and pin

By a mounting bolt

19 / 30

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

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

Yes

Only if a warning light on the dashboard illuminates

20 / 30

A brake chamber is usually mounted where?

Above the wheel that is equipped for braking

In the wheel hub

By the differential

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

21 / 30

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

5 minutes

3 minutes

2 minutes

4 minutes

22 / 30

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

A total loss of brakes

The warning buzzer goes off

The vehicle quickly stops

It reduces the effectiveness of the brake chamber

23 / 30

What happens in the reservoir when the heated air cools?

The air shrinks

It forms condensation

The air expands

Nothing

24 / 30

What is another name for an automatic reservoir drain valve?

Spitter valve

Drip valve

Master valve

Major drain valve

25 / 30

What is another name for the supply reservoir?

Wet reservoir

Main reservoir

Maximum reservoir

Primary reservoir

26 / 30

How often should the tanks be drained?

Weekly

Every 48 hours

When a problem occurs

Daily

27 / 30

What does a safety valve do?

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

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

It cuts off the governor when it begins to overwork

28 / 30

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

Rear are longer

Rear are smaller

Front are smaller

Front are longer

29 / 30

What is the purpose of an air dryer?

To dry the brake pads

To dry the slack adjuster

To dry the brake drums

To reduce the amount of moisture in the system

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 type of vehicle

The size of compressor

Your score is

Air Brake Practice Test 02

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