DC CDL AIR BRAKES PRACTICE TEST
11.
When checking air brakes on combination vehicles, which of the following is NOT part of checking that air flows to all trailers?
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Opening the emergency line shut-off valve at the rear of the last trailer.
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Going to the rear of the rig.
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Pulling tractor forward until the fifth-wheel comes out from under the trailer.
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Using the trailer handbrake to provide air to the service line.
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12.
Excessive use of the service brakes results in overheating and leads to:
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low air pressure.
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reduction of the brake drums.
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brake fade.
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poor traction.
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13.
When should you downshift automatic transmissions?
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When going down steep grades.
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When you start to get drowsy.
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Watch your tachometer, and downshift when your engine reaches the top of the range.
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When you want to go faster.
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14.
If you get stuck on railroad tracks, you should:
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stay in the vehicle and call for help.
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check the engine compartment quickly.
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get out of the vehicle and away from the tracks.
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have a helper push your vehicle.
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15.
In newer vehicles with air brakes, you put on the parking brake:
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moving the orange push-pull lever to the right.
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using a P-shaped, yellow control knob.
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using a diamond-shaped, yellow, push-pull control knob.
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placing the transmission in Park.
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