DC CDL DOUBLES TRIPLES TEST - PRACTICE TEST
11.
Engine oil pressure should come up to normal within _________ after the engine is started.
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two minutes
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seconds
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ten minutes
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five minutes
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12.
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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3/32
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13.
Which of these is more likely to rollover due to the "crack-the-whip" effect?
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The front trailer of 65 ft. conventional doubles
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The last trailer of triples
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5-axle tractor semitrailers
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The last trailer of doubles
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14.
During a walk around inspection of a combination vehicle, drivers should check that:
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the locking jaws are around the shank.
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the glide plate is securely mounted to the trailer frame.
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all locking pins are present and locked in place.
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All of the above.
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15.
If you must make an emergency stop, you should:
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apply the brakes as hard as you can to lock them.
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use the hand brake before the brake pedal.
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brake in a way that will keep your vehicle in a straight line.
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None of the above.
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16.
Which of the following is a common cause of truck fires?
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Short circuits due to loose connections.
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Under-inflated tires and duals that touch.
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loose fuel connections.
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All of the above.
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17.
Tire load is defined as:
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the minimum safe weight a tire can carry at a specified pressure.
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the minimum tire pressure.
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the weight transmitted to the ground by 1 tire.
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the maximum safe weight a tire can carry at a specified pressure.
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18.
Pre-trip inspections are:
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recommended.
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required by law
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required only for trips of more than 50 miles.
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required only for trips of more than 100 miles.
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19.
Which of the following statements about retarders is NOT correct?
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Retarders reduce reduce brake wear.
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Retarders help you avoid skids.
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You should turn the retarder off whenever the road is wet, icy, or snow covered.
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Retarders help slow a vehicle, reducing the need for using brakes.
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20.
On any upgrade, gravity:
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doesn't affect your speed.
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doubles your speed.
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speed you up.
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slows you down.
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