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

Spline

Worm gear

Worm shaft

Slack adjuster

2 / 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

3 / 30

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

The are stiffer

The pedal is thicker

They are spring loaded

None of these

4 / 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

The warning buzzer goes off

A total loss of brakes

The vehicle quickly stops

5 / 30

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

Front are longer

Rear are smaller

Rear are longer

Front are smaller

6 / 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 two-way valve needs adjustment

The brake chamber needs repair

7 / 30

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

Back into the tanks

Into the brake chambers

Into the atmosphere

None of these

8 / 30

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

Nothing

A metal wall

A port

A flexible diaphragm

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 air filter is plugged or if the belt is slipping

If the two-way valve is closed

If the governor has stopped

10 / 30

What are the primary and secondary reservoirs also known as?

Dry reservoir

Wet reservoir

Minor reservoir

Minimal reservoir

11 / 30

What is another name for an automatic reservoir drain valve?

Drip valve

Major drain valve

Master valve

Spitter valve

12 / 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

13 / 30

What gets formed in the bottom of the supply reservoir?

Rust

Flakes

Nothing

Sludge

14 / 30

What is another name for the supply reservoir?

Maximum reservoir

Wet reservoir

Main reservoir

Primary reservoir

15 / 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

The lengthens the slack in the air hoses

None of these

It creates a slack when the brakes are malfunctioning

16 / 30

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

The type of vehicle

The size of compressor

The number of brake chambers and their size

Whether the tractor will be towing trailers

17 / 30

Where would an air dryer be installed?

Next to the two-way valve

Between the compressor and the wet reservoir

Below the foot valve

Next to the governor

18 / 30

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

3 minutes

4 minutes

5 minutes

2 minutes

19 / 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

20 / 30

What happens in the reservoir when the heated air cools?

It forms condensation

Nothing

The air shrinks

The air expands

21 / 30

How often should the tanks be drained?

Every 48 hours

When a problem occurs

Daily

Weekly

22 / 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

23 / 30

A safety valve is normally set at what psi?

150 psi

170 psi

120 psi

135 psi

24 / 30

A brake chamber is usually mounted where?

By the differential

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

Above the wheel that is equipped for braking

In the wheel hub

25 / 30

What compresses the air in the cylinder?

The drive belts

The governor

The upward motion of the piston

None of these

26 / 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

27 / 30

What is meant by the loading stage?

When the system pressure reaches its maximum

When the air is being added to the reservoir

When the system pressure reaches its minimum

When the air is being pushed through the air hoses

28 / 30

What is the purpose of an air dryer?

To reduce the amount of moisture in the system

To dry the slack adjuster

To dry the brake drums

To dry the brake pads

29 / 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

30 / 30

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

It adds additional weight to the system

It slows down the forced air

It reduces the amount of compressed air allowable

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

Your score is

Air Brake Practice Test 02

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