DE CDL DOUBLES TRIPLES TEST - PRACTICE TEST
11.
The center of gravity of a trailer should be:
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as high as possible.
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as low as possible.
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at the front of the trailer.
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at the rear of the trailer.
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12.
When checking the engine compartment in a vehicle inspection, you should check all of the following except:
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Windshield washer fluid level
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Shock absorbers
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Coolant level in radiator
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Engine oil level
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13.
Which of the following is a reason to cover cargo?
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To contain a spill
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To protect people from spilled cargo
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To protect the cargo from weather
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All of the above.
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14.
To reduce the chance of rollover, you should:
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place the cargo as high as possible inside the trailer.
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distributed the cargo as low as possible inside the trailer.
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put the lightest parts of the cargo under the heaviest parts.
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None of the above.
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15.
Empty trucks:
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require a shorter stopping distance than full trucks.
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require a greater stopping distance than full trucks.
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require the same stopping distance than full trucks.
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None of the above.
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16.
If you must stop on a one-way or divided highway, you should place warning devices _______ toward the approaching traffic.
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10, 100 and 200 feet
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5, 25 and 50 feet
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3, 15 and 45 feet
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5, 50 and 500 feet
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17.
When you make a quick lane change, the crack-the-whip effect can turn the trailer over. The crack-the-whip effect is caused by:
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the rear trailer of a triple.
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strong wind.
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worn tire tread.
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rearward amplification.
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18.
If your vehicle is equipped with air brakes, loss of air pressure in the emergency line will cause:
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the springs to put on the brakes.
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the vehicle to slide back and forth.
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the trailer supply valve to open.
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the trailer emergency brakes to come on.
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19.
The tractor protection valve:
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prevents the trailer from being accidentally released.
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keeps your wheels from locking up when you brake hard.
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keeps air in the brake system should the trailer develop a bad leak.
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keeps air from going out if the air compressor develops a leak.
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20.
Too little weight on the driving axles can cause:
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longer stopping distances.
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mechanical damage.
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poor visibility.
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poor traction.
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