CDL COMBINATION PRACTICE TEST (MO)
11.
Which of the following is most likely to roll over?
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The rear trailer of a triple
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The front trailer of a double
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The rear trailer of a double
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12.
A steering wheel should have no more than _____ of play. If there is more play than this, it may be hard to steer.
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30 degrees
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10 degrees
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15 degrees
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13.
Which of the following is NOT part of inspecting the coupling?
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Making sure there is no space between the upper and the lower fifth-wheel
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Checking for enough clearance between the rear of the tractor frame and the landing gear.
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Checking that the locking lever is in the "lock" position
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14.
As part of your vehicle inspection, you are checking that air flows to all trailers. After using the trailer handbrake to provide air to the service line, you go to the rear of the rig. When you open the emergency line shut-off valve at the rear of the last trailer, you should hear:
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a mechanical vibration.
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air escaping from the open valve.
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the service line valve close.
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15.
Which of the following may have reduced the clearances since the heights were posted at bridges and overpasses?
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Rain
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Repaving of the road
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The weight of a cargo
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16.
The heavier the vehicle:
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the more work the brakes must do to stop it.
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the less work the brakes must do to stop it.
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the higher the center of gravity will be.
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17.
When transporting cargo, the cargo should be checked:
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only before the trip.
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before the trip and after the first 150 miles.
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before the trip and after the first 50 miles.
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18.
When you are driving on a slippery road, you should NOT:
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adjust turning and braking to road conditions.
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keep a longer following distance.
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use the engine brake or speed retarder.
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19.
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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rearward amplification.
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strong wind.
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the rear trailer of a triple.
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20.
You must have at least 4/32 inch tread depth in every major groove on front tires and at least ___ inch on other tires.
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4/32
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1/32
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2/32
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