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UPGRADE TO CDL PREMIUM
1.
Which of the following is not a type of retarder?
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Hydraulic
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Electric
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Pressure
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Exhaust
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2.
The best way to recognize that your trailer has started to skid is:
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by seeing it in your mirrors.
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by recognizing tire failure.
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by opening the window and feeling the front of the mirror.
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by feeling the brakes come on.
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3.
If the low air pressure warning light comes on, you should:
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stop immediately.
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continue to drive normally.
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call for help.
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set the parking brake.
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4.
With the air pressure built up to governor cutoff, the maximum leakage rates per minute are ___ psi for single vehicles and ___ psi for a combination of 2 vehicles.
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5; 6
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3; 2
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4; 5
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3; 4
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5.
When the spring brakes are on, you should never:
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decrease your speed.
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push the brake pedal down.
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change lanes.
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upshift.
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6.
In vehicles with air brakes, the two markings on a front brake limiting valve are:
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normal and slippery.
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left and right.
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wet and dry.
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high and low.
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7.
You are coming down a long, steep downgrade. Which of the following is a sign that your brakes may have started to fade?
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The brake pedal feels spongy or goes to the floor.
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The steering feels heavy.
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You hear a loud "bang".
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You have to apply your brakes harder and harder to get the same stopping power.
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8.
When backing a trailer, turn the wheel right to make the cab go ________ and the trailer go ________.
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left; left
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right; right
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right; left
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left; right
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9.
Front wheel braking is good:
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under all conditions.
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Never.
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only in wet conditions.
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only in good weather.
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10.
When driving a 60 foot truck at 35 mph in ideal conditions, you should keep at least _______ of space in front of you.
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5 seconds
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4 seconds
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12 seconds
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6 seconds
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