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 gets formed in the bottom of the supply reservoir?

Nothing

Sludge

Rust

Flakes

2 / 30

What is another name for an automatic reservoir drain valve?

Drip valve

Spitter valve

Major drain valve

Master valve

3 / 30

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

Rear are smaller

Front are smaller

Rear are longer

Front are longer

4 / 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

5 / 30

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

Worm gear

Slack adjuster

Spline

Worm shaft

6 / 30

What are the primary and secondary reservoirs also known as?

Dry reservoir

Minimal reservoir

Minor reservoir

Wet reservoir

7 / 30

What is meant by the loading stage?

When the air is being pushed through the air hoses

When the system pressure reaches its minimum

When the system pressure reaches its maximum

When the air is being added to the reservoir

8 / 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

9 / 30

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

Parts of the brakes fall away

The brakes will grab and the vehicle stops abruptly

A total brake failure

Effective braking is reduced and brake lag time is increased

10 / 30

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

The size of compressor

Whether the tractor will be towing trailers

The type of vehicle

The number of brake chambers and their size

11 / 30

What compresses the air in the cylinder?

The governor

The drive belts

The upward motion of the piston

None of these

12 / 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

To the air dryer

Past the one-way check valve

Past the low-pressure indicators

13 / 30

What does a safety valve do?

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

It protects the compressor from over-loading the system

14 / 30

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

A port

A metal wall

A flexible diaphragm

Nothing

15 / 30

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

4 minutes

5 minutes

2 minutes

3 minutes

16 / 30

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

It prevents the moisture from freezing in cold climate operation

None of these

It helps to keep the air hoses flexible

It warms the air coming from the supply tank

17 / 30

How often should the tanks be drained?

Daily

Every 48 hours

Weekly

When a problem occurs

18 / 30

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

None of these

They are spring loaded

The pedal is thicker

The are stiffer

19 / 30

What is the purpose of an air dryer?

To dry the brake pads

To dry the brake drums

To dry the slack adjuster

To reduce the amount of moisture in the system

20 / 30

What is another name for the supply reservoir?

Maximum reservoir

Wet reservoir

Primary reservoir

Main reservoir

21 / 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 slows down the forced air

It reduces the amount of compressed air allowable

It adds additional weight to the system

22 / 30

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

Yes

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

Only if a warning light on the dashboard illuminates

23 / 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

24 / 30

What happens in the reservoir when the heated air cools?

It forms condensation

The air expands

The air shrinks

Nothing

25 / 30

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

If the reservoir is full

If the two-way valve is closed

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

If the governor has stopped

26 / 30

What does a slack adjuster do?

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

None of these

The lengthens the slack in the air hoses

27 / 30

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

Back into the tanks

Into the brake chambers

None of these

Into the atmosphere

28 / 30

What happens if the safety valve has to relieve pressure?

The two-way valve needs adjustment

The brake chamber needs repair

There is a leak with an air hose

The governor or compressor requires adjustment, service or repair

29 / 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

30 / 30

A safety valve is normally set at what psi?

120 psi

170 psi

150 psi

135 psi

Your score is

Air Brake Practice Test 02

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