IDAHO CDL AIR BRAKES PRACTICE TEST
11.
Which of the following is NOT TRUE? When you drive a tractor-trailer combination with ABS, you should:
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monitor your tractor and trailer as you slow down, and if it is safe to do so, back off the brakes to stay in control.
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brake the same way, regardless of whether you have ABS on the tractor, the trailer, or both.
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drive slower to keep your vehicle in a straight line.
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12.
ABS helps you:
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avoid wheel lock up and maintain control of your vehicle when you brake.
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steer gently and smoothly while you are braking.
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increase your normal braking capability.
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13.
The tractor protection valve:
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provides the air supply for the brake system.
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will close automatically if the air pressure drops to a certain level.
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All of the above.
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14.
You are driving on a steep downgrade. If your safe speed is 35 mph, you should apply the brakes when your speed reaches:
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35 mph
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30 mph
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25 mph
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15.
Most heavy vehicles require ________ change gears.
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single clutching
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double clutching
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double shifting
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