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?

Yes

Only if a warning light on the dashboard illuminates

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

2 / 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

3 / 30

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

Into the atmosphere

Into the brake chambers

None of these

Back into the tanks

4 / 30

What is another name for the supply reservoir?

Primary reservoir

Wet reservoir

Maximum reservoir

Main reservoir

5 / 30

A brake chamber is usually mounted where?

By the differential

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

6 / 30

What happens in the reservoir when the heated air cools?

The air expands

Nothing

The air shrinks

It forms condensation

7 / 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 low-pressure indicators

To the air dryer

Past the one-way check valve

8 / 30

What does a safety valve do?

It protects the compressor from over-loading the system

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

It cuts off the governor when it begins to overwork

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

9 / 30

What is meant by the loading stage?

When the air is being added to the reservoir

When the air is being pushed through the air hoses

When the system pressure reaches its maximum

When the system pressure reaches its minimum

10 / 30

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

4 minutes

2 minutes

5 minutes

3 minutes

11 / 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 governor has stopped

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

If the reservoir is full

12 / 30

What compresses the air in the cylinder?

None of these

The drive belts

The upward motion of the piston

The governor

13 / 30

A safety valve is normally set at what psi?

120 psi

170 psi

150 psi

135 psi

14 / 30

What does a slack adjuster do?

It creates a slack when the brakes are malfunctioning

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

15 / 30

What are the primary and secondary reservoirs also known as?

Dry reservoir

Wet reservoir

Minor reservoir

Minimal reservoir

16 / 30

How id the push rod connected to the slack adjuster?

By a slack bolt

By a mounting bolt

By a clevis and pin

By a lock screw

17 / 30

How often should the tanks be drained?

Daily

Weekly

Every 48 hours

When a problem occurs

18 / 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

19 / 30

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

None of these

It prevents the moisture from freezing in cold climate operation

It helps to keep the air hoses flexible

It warms the air coming from the supply tank

20 / 30

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

Nothing

A metal wall

A port

A flexible diaphragm

21 / 30

What gets formed in the bottom of the supply reservoir?

Nothing

Sludge

Rust

Flakes

22 / 30

Where would an air dryer be installed?

Next to the two-way valve

Below the foot valve

Between the compressor and the wet reservoir

Next to the governor

23 / 30

What is another name for an automatic reservoir drain valve?

Drip valve

Master valve

Spitter valve

Major drain valve

24 / 30

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

Worm shaft

Spline

Worm gear

Slack adjuster

25 / 30

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

Front are longer

Rear are longer

Rear are smaller

Front are smaller

26 / 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

27 / 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

28 / 30

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

The warning buzzer goes off

The vehicle quickly stops

A total loss of brakes

It reduces the effectiveness of the brake chamber

29 / 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 brake chamber needs repair

The two-way valve needs adjustment

30 / 30

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

Effective braking is reduced and brake lag time is increased

A total brake failure

The brakes will grab and the vehicle stops abruptly

Parts of the brakes fall away

Your score is

Air Brake Practice Test 02

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