1 . How is water and compressor oil removed from the bottom of an air storage tank?

The water and oil are siphoned out of the tank.
A drain valve is opened to remove the water and oil from the tank.
The water and oil are removed automatically as the brakes are used.
A sponge is used to soak up the water and oil.
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2 . How many air storage tanks are used in an air brake system?

Two tanks
Four tanks
Six tanks
The number varies.
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3 . When you press the brake pedal in a vehicle with S-cam brakes, air pressure pushes out the rod and moves the:

Slack adjuster.
Axle.
Brake drum.
Alcohol evaporator.
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4 . What does ABS do?

Prevent wheel lockup
Prevent the air compressor from overheating
Prevent the front brakes from being used on ice
Prevent the brakes from being used if downshifting would be more effective
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5 . If the low pressure warning signal activates while you are driving, you should:

Continue driving normally.
Exit the road and park as soon as safely possible.
Stop where you are and park.
Put on your hazard lights and continue driving.
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6 . In a dual air brake system:

Each system has separate air tanks, hoses, and lines.
The systems share air tanks, but each has its own separate hoses and lines.
Each system uses the same lines and hoses.
One system is the main braking system and a second system is ready to be used if the first one fails.
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7 . Which of the following is not a part of an air brake system?

A service brake system
A parking brake system
An emergency brake system
An axle brake system
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8 . Friction inside a brake drum is caused when the brake shoes and linings:

Push against each other.
Separate from the axle.
Push against the inside of the drum.
Create excess heat.
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9 . During a static leakage test, the maximum leakage rate for a single vehicle with air brakes is ____ in one minute.

1 psi
2 psi
3 psi
4 psi
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10 . A dual air brake system:

Has a single air brake system, but uses two sets of controls.
Has one air brake system for each side of the truck.
Has two brakes for each wheel.
Has two separate air brake systems, but uses a single set of controls.
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11 . During a static leakage test, the maximum leakage rate for a double combination vehicle is:

3 psi in one minute.
6 psi in one minute.
8 psi in one minute.
4 psi in one minute.
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12 . To ensure normal stopping power, drivers of vehicles equipped with a front brake limiting valve should:

Set the control to normal.
Set the control to the off position.
Set the control to neutral.
Keep the control at the halfway mark.
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13 . During a walk-around inspection, ensure there are no cracks on the brake drums that are more than ____ of the width of the friction area.

One half
One quarter
One third
One tenth
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14 . Brakes may get out of adjustment:

If they are too hot.
In colder weather.
If they are used.
If they get wet.
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15 . A visual low pressure warning signal should activate before air pressure drops to a level between:

55 and 75 psi.
35 and 50 psi.
75 and 100 psi.
40 and 60 psi.
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16 . What color is the low air pressure warning light?

Green
Orange
Red
Purple
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17 . In cold weather, an alcohol evaporator should be checked and filled:

Once a week.
Every day.
Every hour.
Once a month.
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18 . During a static leakage test, the maximum leakage rate for a triple combination vehicle with air brakes is ____ in a minute.

3 psi
5 psi
7 psi
9 psi
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19 . Pressing and releasing a brake pedal unnecessarily can:

Release air faster than it can be replaced.
Add more air to the braking system.
Make the brake pedal more sensitive.
Create a loud noise.
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20 . An air compressor governor will stop the compressor from pumping air once the air tanks have an air pressure level of:

125 psi.
100 psi.
150 psi.
80 psi.
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21 . Most heavy-duty vehicles use ____ air brake systems.

Single
Dual
Triple
Quad
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22 . If your tractor is equipped with ABS but your trailer is not, the ABS:

Will not be effective.
Will still improve your steering control.
Will make jackknifing easier.
Will allow others to see when you brake.
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23 . What can happen if the air pressure gets too low in an air brake system?

The brakes may squeak.
The brakes may not work.
The brakes may be sluggish.
The brakes will be very sensitive.
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24 . To use the stab braking method in an emergency situation, you should:

Apply the brakes completely until the wheels lock up, release the brakes until the wheels start rolling, then repeat the process.
Apply the brakes about halfway, but keep the wheels rolling.
Fully apply the brakes, let the wheels lock up, and hold the brake pedal down, keeping the wheels locked until the vehicle stops.
Apply the emergency brake.
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25 . During an applied leakage test, the maximum leakage rate for a single vehicle with air brakes is:

3 psi in one minute.
6 psi in one minute.
8 psi in one minute.
4 psi in one minute.
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