CDL COMBINATION PRACTICE TEST (PA)
11.
Off-tracking is:
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when a vehicle towing a trailer skids, and the trailer pushes the towing vehicle from behind until it spins the vehicle around.
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when the tires lose their contact with the road and have little or no traction.
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when a vehicle makes a turn and the rear wheels of the trailer end up driving in a different path than the tractor and the front wheels of the trailer.
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None of the above.
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12.
To prevent a rollover, the driver should:
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pay extra attention to the coolant level.
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drive on the shoulder if possible.
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drive slowly around corners, on ramps, and off ramps.
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make quick lane changes if possible.
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13.
If an item placed on a flatbed trailer is 7 feet long, it should have __ tie-downs.
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7
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3
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2
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1
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14.
You must check that all shut-off valves are in the open position except the ones:
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on the first trailer in a set of triples.
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at the back of the last trailer.
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on the middle trailer of a set of triples.
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on the first trailer in a set of doubles.
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15.
The trailer hand valve should:
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never be used for parking.
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never be used to test the trailer brakes.
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be used in driving.
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All of the above.
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16.
You are driving a combination vehicle and must use your brakes to avoid a crash. You should:
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push the brake pedal as hard as you can and hold it there.
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use the parking brake.
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brake lightly and hold the steering wheel firmly.
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use stab braking or controlled braking.
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17.
If a load is placed on one side of the trailer:
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making turns may be easier.
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a rollover is more likely.
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the steering axle weight will be too light to steer safely.
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your brakes won't work.
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18.
Headache racks:
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can blind other drivers.
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protect you from being hit by your cargo.
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help you keep weights within legal limits.
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None of the above.
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19.
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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The weight of a cargo
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Traffic
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Repaving of the road
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20.
Empty trucks:
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have better traction than fully-loaded trucks.
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require shorter stopping distances than fully-loaded trucks.
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may have poor traction.
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None of the above.
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