DELAWARE CDL AIR BRAKES PRACTICE TEST
16.
Stepping on and off the brake pedal several times:
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reduces the air pressure in the tanks.
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may cause air leaks.
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may result in dangerously thin linings.
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All of the above.
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17.
When coupling, you should:
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be aware that wrong coupling and uncoupling can be very dangerous.
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make sure the trailer kingpin is bent.
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make sure the sliding fifth-wheel is locked.
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make sure the trailer wheels are not chocked.
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18.
To check slack adjusters on S-cam brakes, you should:
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check that the spring brakes come on automatically.
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press the brake pedal and listen for any strange noises.
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use gloves and pull hard on each slack adjuster you can reach.
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All of the above.
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19.
When you make a quick lane change, the crack-the-whip effect can:
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make it harder to turn without skidding.
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the trailer to swing wide to the left.
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turn the trailer over.
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improve your traction.
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20.
When backing, you should:
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back and turn toward the right side whenever possible.
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use the mirrors on both sides.
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back quickly.
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only use mirror on the driver's side.
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