SC CDL COMBINATION TEST - PRACTICE TEST
11.
When driving a 50 foot combination vehicle at 50 mph in ideal conditions, you should keep at least ____ seconds of space in front of you.
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5
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10
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4
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6
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12.
You should not use the trailer hand brake to straighten out a jackknifing trailer. Why?
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You should use the emergency break instead.
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The brakes on the trailer wheels will not respond.
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The brakes on the trailer wheels caused the skid in the first place.
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You should use the service break instead.
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13.
Weight that is loaded so there is a high center of gravity:
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makes a vehicle easier to handle.
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causes greater chance of rollover.
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reduces the chance that the load will shift to the side or fall off.
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All of the above.
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14.
If you feel drowsy while driving, what should you do?
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Get an energy drink.
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Turn on the radio to keep you awake.
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Eat heavy foods.
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Pull off the road and get some sleep.
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15.
When you get ready to back under the semi-trailer, you should:
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back under the trailer at an angle to avoid pushing the trailer sideways.
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line up about 15 degrees off the line of the trailer.
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line up the kingpin to engage the driver's side locking jaw first.
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line up directly in front of the trailer.
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16.
You should always try to back toward the driver's side because:
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you can watch the rear of your vehicle out the side window.
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you can more easily correct any steering errors.
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backing toward the left side is more dangerous.
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None of the above.
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17.
What are the two basic reasons for covering cargo?
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To protect people from spilled cargo and the cargo from pilferage.
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To protect people from spilled cargo and the cargo from weather.
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To protect the cargo from weather and to avoid littering.
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To protect the cargo from pilferage and from weather.
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18.
Most heavy vehicles require ________ change gears.
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double clutching
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double shifting
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triple shifting
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single clutching
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19.
The front trailer supports are up, and the trailer is resting on the tractor. Make sure:
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there is enough clearance between the rear of the tractor frame and the landing gear.
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there is enough clearance between the top of the tractor tires and the nose of the trailer.
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the electrical and air connections are properly connected between the tractor and the trailer.
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All of the above.
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20.
Empty trucks have the best braking. True or False?
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True.
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It depends on the truck.
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False.
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It depends on the cargo.
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