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

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

4 minutes

3 minutes

5 minutes

2 minutes

2 / 30

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

Only if a warning light on the dashboard illuminates

Yes

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

3 / 30

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

Past the low-pressure indicators

Past the one-way check valve

To the air dryer

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

4 / 30

What are the primary and secondary reservoirs also known as?

Wet reservoir

Dry reservoir

Minor reservoir

Minimal reservoir

5 / 30

A safety valve is normally set at what psi?

135 psi

150 psi

170 psi

120 psi

6 / 30

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

The pedal is thicker

They are spring loaded

The are stiffer

None of these

7 / 30

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

A flexible diaphragm

A port

Nothing

A metal wall

8 / 30

What does a slack adjuster do?

None of these

It creates a slack when the brakes are malfunctioning

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

9 / 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 governor has stopped

If the two-way valve is closed

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

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

What does a safety valve do?

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

It cuts off the governor when it begins to overwork

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

12 / 30

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

Worm gear

Spline

Slack adjuster

Worm shaft

13 / 30

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

A total brake failure

Effective braking is reduced and brake lag time is increased

The brakes will grab and the vehicle stops abruptly

Parts of the brakes fall away

14 / 30

What is the purpose of an air dryer?

To dry the brake pads

To reduce the amount of moisture in the system

To dry the slack adjuster

To dry the brake drums

15 / 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

16 / 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

17 / 30

What is another name for the supply reservoir?

Wet reservoir

Main reservoir

Primary reservoir

Maximum reservoir

18 / 30

What compresses the air in the cylinder?

The governor

The drive belts

None of these

The upward motion of the piston

19 / 30

A brake chamber is usually mounted where?

Above the wheel that is equipped for braking

By the differential

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

In the wheel hub

20 / 30

How often should the tanks be drained?

Weekly

When a problem occurs

Every 48 hours

Daily

21 / 30

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

The size of compressor

The type of vehicle

Whether the tractor will be towing trailers

The number of brake chambers and their size

22 / 30

How id the push rod connected to the slack adjuster?

By a mounting bolt

By a lock screw

By a slack bolt

By a clevis and pin

23 / 30

What is meant by the loading stage?

When the air is being added to the reservoir

When the system pressure reaches its maximum

When the system pressure reaches its minimum

When the air is being pushed through the air hoses

24 / 30

What gets formed in the bottom of the supply reservoir?

Rust

Sludge

Nothing

Flakes

25 / 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

26 / 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

27 / 30

What happens in the reservoir when the heated air cools?

It forms condensation

The air shrinks

Nothing

The air expands

28 / 30

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

The warning buzzer goes off

It reduces the effectiveness of the brake chamber

The vehicle quickly stops

A total loss of brakes

29 / 30

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

Into the brake chambers

Back into the tanks

None of these

Into the atmosphere

30 / 30

What is another name for an automatic reservoir drain valve?

Drip valve

Spitter valve

Master valve

Major drain valve

Your score is

Air Brake Practice Test 02

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