DELAWARE CDL COMBINATION PRACTICE TEST
11.
You are hooking up to an old trailer. The trailer does not have spring brakes. If you cross the air lines:
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the trailer hand valve will apply the tractor brakes instead of the trailer brakes.
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you will be able to drive away but you will not have trailer brakes.
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the glad hands will be locked together.
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None of the above.
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12.
When driving in a construction zone, if a construction worker is near the road, you should:
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further reduce your speed.
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speed up.
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come to a complete stop.
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maintain a constant speed.
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13.
When the wheels of a trailer lock up:
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ABS will increase stopping power.
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the vehicle will gradually come to a complete stop.
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the trailer will tend to swing around.
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All of the above.
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14.
When uncoupling, after you unlock the fifth-wheel you should:
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chock the trailer wheels.
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ease the pressure on the locking jaws.
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pull the tractor clear of the trailer.
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pull the tractor partially clear of the trailer.
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15.
Which of the following is true about the trailer hand valve?
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If used in driving it could cause the trailer to skid.
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The trailer hand valve works the trailer brakes.
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It should be used only to test the trailer brakes.
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All of the above.
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16.
The tire load rating is stated:
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inside the suspension system.
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on each axle.
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on the side of each tire.
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on the dashboard.
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17.
By pushing the trailer air supply control knob in, you:
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supply the tires with air.
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supply the trailer with air.
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keeps air in the tractor or truck brake system.
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shut the air off and put on the trailer emergency brakes.
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18.
What is countersteering?
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Locking your wheels while turning in an emergency situation.
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Turning the steering wheel quickly the other way after steering in an emergency situation.
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Driving too fast for conditions.
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Staying off the brake while steering to the right to avoid an accident.
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19.
After a tire has been changed, you should:
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deflate the tire to 15 psi.
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wait at least 30 minutes before driving.
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decrease tire pressure.
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stop a short while later and check that the nuts are tight.
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20.
Which of the following is NOT part of checking the sliding fifth-wheel?
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Checking that all locking pins are present and locked in place
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Checking that the slide is not damaged or parts are missing
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Checking that it is properly greased
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Testing the tractor protection valve
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