1 . An air compressor governor controls:

When the air compressor pumps air into the air storage tanks.
How fast air is pumped into the air storage tanks.
The temperature of the air pumped into the air storage tanks.
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2 . You must have an air brake endorsement:

To use a vehicle with air brakes.
To drive any truck with a trailer.
To transport hazardous materials.
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3 . What can happen if the air pressure gets too low in an air brake system?

The brakes may squeak.
The brakes may stop working.
The brakes may be sluggish.
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4 . Lights that indicate that anti-lock brakes are not working are:

Gray.
Blue.
Yellow.
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5 . An alcohol evaporator in an air brake system:

Makes the brakes work without squeaking.
Prevents ice from forming in the braking system.
Lubricates parts of the braking system.
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6 . An alcohol evaporator is especially important:

In cold weather.
In hot weather.
In dry weather.
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7 . Air tank drains should:

Only be used by mechanics.
Only be used when it is wet outside.
Be used to drain the tanks completely.
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8 . Alcohol evaporators are:

Illegal.
Used to introduce alcohol into air brake systems.
Only allowed in the northern parts of the state.
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9 . Why do large vehicles use air brakes?

Other brake systems squeak too loudly.
Air brakes are very effective systems.
Other braking systems are hard to come by.
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10 . A low air pressure warning signal should activate:

When tank pressure falls below 120 psi.
When tank pressure falls below 60 psi.
When tank pressure falls below 10 psi.
When tank pressure falls below 5 psi.
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11 . To make a stop in a vehicle equipped with air brakes, the driver should:

Press the brake pedal down.
Lift the brake pedal up.
Pull out the air brake knob.
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12 . Truck tractors with air brakes built on or after March 1, 1997 must have:

An Anti-Lock Braking System (ABS).
Bluetooth.
A GPS.
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13 . What kind of force do emergency brakes use?

Air pressure
Mechanical
Heavy
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14 . Brake fade is a result of:

Brakes being exposed to sunlight.
Brakes being exposed to moisture.
Excessive use of the brakes.
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15 . If the safety relief valve in an air brake system is releasing air:

You should not be concerned as this is a normal process.
There is something wrong with the brakes.
The valve is operational.
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16 . The ____ are activated by an electric switch that is triggered by the brake pedal.

Headlights
Turn signals
Brake lights
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17 . What is often found in compressed air?

Water
Cardboard
Brake fluid
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18 . Foundation brakes are used:

Only on the front wheels of a vehicle.
Only on the rear wheels of a vehicle.
On each wheel of a vehicle.
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19 . If an air compressor is belt-driven, the belt should be routinely checked to ensure that it is:

Thin.
Properly tightened.
Cracked.
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20 . What do the two systems of a dual air brake system share?

Hoses
An air compressor
Air tanks
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21 . Do not operate a vehicle if any brake drums have cracks that are larger than ____ of the width of the friction area.

One half
One third
One fifth
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22 . What does the air compressor governor do?

It stops the compressor from pumping air.
It turns on the air compressor.
It stores the compressed air.
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23 . When leaving your vehicle unattended:

The parking brake should be used.
The parking brake only needs to be used if the vehicle is parked on a slope.
The parking brake should not be used, as it can damage the tires.
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24 . If the air pressure in an air brake system becomes too low, it may:

Cause the brakes to lock up.
Cause the brakes to stop working.
Cause the brakes to pulsate when used.
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25 . When you are about to start down a hill, you should switch into a ____ gear.

Higher
Faster
Lower
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