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

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

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

Only if a warning light on the dashboard illuminates

Yes

2 / 30

What are the primary and secondary reservoirs also known as?

Minor reservoir

Wet reservoir

Minimal reservoir

Dry reservoir

3 / 30

What compresses the air in the cylinder?

The upward motion of the piston

The drive belts

None of these

The governor

4 / 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

5 / 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 stops the air flow from the compressor to the supply tank

It protects the compressor from over-loading the system

It cuts off the governor when it begins to overwork

6 / 30

What is another name for the supply reservoir?

Maximum reservoir

Primary reservoir

Wet reservoir

Main reservoir

7 / 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

8 / 30

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

None of these

Into the atmosphere

Back into the tanks

Into the brake chambers

9 / 30

How id the push rod connected to the slack adjuster?

By a lock screw

By a clevis and pin

By a mounting bolt

By a slack bolt

10 / 30

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

The pedal is thicker

None of these

The are stiffer

They are spring loaded

11 / 30

A safety valve is normally set at what psi?

150 psi

120 psi

170 psi

135 psi

12 / 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

13 / 30

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

It warms the air coming from the supply tank

It prevents the moisture from freezing in cold climate operation

None of these

It helps to keep the air hoses flexible

14 / 30

What happens if the safety valve has to relieve pressure?

There is a leak with an air hose

The brake chamber needs repair

The two-way valve needs adjustment

The governor or compressor requires adjustment, service or repair

15 / 30

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

It reduces the effectiveness of the brake chamber

A total loss of brakes

The vehicle quickly stops

The warning buzzer goes off

16 / 30

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

It adds additional weight to the system

It reduces the amount of compressed air allowable

It slows down the forced air

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

17 / 30

What is another name for an automatic reservoir drain valve?

Spitter valve

Drip valve

Major drain valve

Master valve

18 / 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

19 / 30

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

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

Past the one-way check valve

To the air dryer

Past the low-pressure indicators

20 / 30

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

Spline

Slack adjuster

Worm shaft

Worm gear

21 / 30

What is the purpose of an air dryer?

To dry the slack adjuster

To dry the brake pads

To dry the brake drums

To reduce the amount of moisture in the system

22 / 30

What does a slack adjuster do?

None of these

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

It creates a slack when the brakes are malfunctioning

23 / 30

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

The brakes will grab and the vehicle stops abruptly

A total brake failure

Effective braking is reduced and brake lag time is increased

Parts of the brakes fall away

24 / 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

25 / 30

How often should the tanks be drained?

When a problem occurs

Daily

Weekly

Every 48 hours

26 / 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

Above the wheel that is equipped for braking

By the differential

27 / 30

What happens in the reservoir when the heated air cools?

The air shrinks

Nothing

It forms condensation

The air expands

28 / 30

What gets formed in the bottom of the supply reservoir?

Sludge

Nothing

Rust

Flakes

29 / 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

30 / 30

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

A port

A metal wall

Nothing

A flexible diaphragm

Your score is

Air Brake Practice Test 02

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