1 . What must be on an air tank in an air-braked vehicle?

A check valve
A lock
A trap door
An oxidizer
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2 . When a tire goes flat, you may hear a loud bang. The truck will be affected:

Immediately.
After a short delay.
Only if the damaged tire is near the front of the truck.
Only if the truck is hauling a load.
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3 . If unsure if a road is becoming icy, a driver can:

Guess.
Open the window and check the front of the mirror for ice.
Try to look at the road closely.
Look at a weather forecast.
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4 . When doing an inspection, ensure that the brake pads are:

Covered with grease.
Covered with coolant.
Covered with oil.
Free of oil or grease.
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5 . Why do drivers have to inspect their vehicles?

It is usually a company policy.
It is usually a local ordinance.
It is a federal and state law.
It adds to the amount of time for which they will be paid.
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6 . When the spring brakes are activated in a vehicle with air brakes, you should never:

Turn on the lights.
Turn the vehicle off.
Push the brake pedal down.
Open the trailer doors.
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7 . An Anti-Lock Braking System (ABS):

Cannot be used with air brakes.
Should be used on dry pavement.
Can assist in maintaining control when braking.
Should only be used if all axles have ABS.
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8 . Why should your mirrors be adjusted to show the road behind you as well as part of your vehicle?

Having only the road in the mirrors would likely make the driver carsick.
Having part of the truck in the mirrors serves as a point of reference.
It is illegal to have only the road in the mirrors.
The driver should be able to see the reflection of surrounding vehicles on the trailer.
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9 . Over-the-counter medication:

Poses no safety risks to a driver.
Is not referenced by any laws regarding driving under the influence.
Cannot impair a driver.
Can affect a person’s ability to drive safely.
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10 . Driving at night is usually:

More difficult than driving during the day.
Simpler than driving during the day.
Discouraged.
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11 . When checking your tires, which of the following is not an issue to correct?

Too much air pressure
Too little air pressure
Radial and bias-ply tires used together
Tread depth of at least 4/32 of an inch on the front tires
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12 . In a dual air brake system:

Air tanks are shared by both systems.
Each system has its own air tanks.
You must designate which system you are using.
Brakes on only one side of the vehicle will work.
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13 . If using the spring brakes while hauling a heavy load, a complete stop will:

Be impossible.
Take a long time.
Take a short amount of time.
Damage the brakes.
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14 . When an S-cam turns inside a brake drum, the S-cam:

Presses the brake shoes against the inside of the brake drum.
Presses the brake shoes against the brake linings.
Presses the brake linings against the wheel axles.
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15 . If unable to tell if the road is becoming icy and slippery, a driver:

Should try guessing.
May open their window and feel the front of the side mirror for ice.
Should look at the road closely.
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16 . Once they have begun to drive after a tire on their vehicle has been changed, a driver should stop after a short distance to:

Ensure that the lug nuts are still tight.
Ensure that the tire is wearing evenly.
Ensure that the air pressure of the tire is still acceptable.
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17 . Why do large vehicles use air brakes?

Other brake systems squeak too loudly.
Air braking systems are very effective.
Air brakes are complicated.
Air is free.
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18 . Tar in road pavement often rises to the surface of the road in very hot weather. Spots where the tar bleeds:

Are very slippery.
Offer the same amount of traction as the rest of the roadway.
Offer more traction than the rest of the roadway.
Will stop a vehicle.
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19 . A vehicle equipped with an Anti-Lock Braking System (ABS) uses a ____ light to warn that the system is not working properly.

Green
Yellow
Orange
White
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20 . Air pressure should build up in a single air system within:

15 minutes.
12 minutes.
Three minutes.
One minute.
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