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 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

2 / 30

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

Slack adjuster

Spline

Worm shaft

Worm gear

3 / 30

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

None of these

The pedal is thicker

The are stiffer

They are spring loaded

4 / 30

What does a safety valve do?

It protects the compressor from over-loading the system

It cuts off the governor when it begins to overwork

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

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

5 / 30

Where would an air dryer be installed?

Between the compressor and the wet reservoir

Next to the two-way valve

Below the foot valve

Next to the governor

6 / 30

What is meant by the loading stage?

When the air is being added to the reservoir

When the system pressure reaches its minimum

When the system pressure reaches its maximum

When the air is being pushed through the air hoses

7 / 30

What happens in the reservoir when the heated air cools?

The air expands

The air shrinks

Nothing

It forms condensation

8 / 30

What compresses the air in the cylinder?

None of these

The drive belts

The upward motion of the piston

The governor

9 / 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

It reduces the effectiveness of the brake chamber

The vehicle quickly stops

10 / 30

A safety valve is normally set at what psi?

120 psi

150 psi

135 psi

170 psi

11 / 30

What is another name for the supply reservoir?

Wet reservoir

Main reservoir

Maximum reservoir

Primary reservoir

12 / 30

What gets formed in the bottom of the supply reservoir?

Nothing

Rust

Flakes

Sludge

13 / 30

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

Rear are smaller

Rear are longer

Front are longer

Front are smaller

14 / 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

15 / 30

A brake chamber is usually mounted where?

Above the wheel that is equipped for braking

In the wheel hub

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

By the differential

16 / 30

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

2 minutes

5 minutes

4 minutes

3 minutes

17 / 30

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

A port

A flexible diaphragm

Nothing

A metal wall

18 / 30

What are the primary and secondary reservoirs also known as?

Minimal reservoir

Wet reservoir

Dry reservoir

Minor reservoir

19 / 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

20 / 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

21 / 30

How often should the tanks be drained?

Weekly

Daily

When a problem occurs

Every 48 hours

22 / 30

How id the push rod connected to the slack adjuster?

By a clevis and pin

By a lock screw

By a slack bolt

By a mounting bolt

23 / 30

What does a slack adjuster do?

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

None of these

It creates a slack when the brakes are malfunctioning

24 / 30

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

It reduces the amount of compressed air allowable

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

It adds additional weight to the system

It slows down the forced air

25 / 30

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

The type of vehicle

Whether the tractor will be towing trailers

The number of brake chambers and their size

The size of compressor

26 / 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

None of these

It warms the air coming from the supply tank

27 / 30

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

If the two-way valve is closed

If the reservoir is full

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

If the governor has stopped

28 / 30

What is another name for an automatic reservoir drain valve?

Major drain valve

Master valve

Drip valve

Spitter valve

29 / 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

30 / 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

Your score is

Air Brake Practice Test 02

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