IN CDL DOUBLES TRIPLES PRACTICE TEST
11.
If you're feeling tired while driving you should:
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eat something.
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stop driving and get some rest.
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increase your speed to get to your destination quicker.
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drink coffee.
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12.
What happens when the center of gravity of a truck moves higher up from the road?
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The vehicle is more stable while turning.
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It is easier it is to turn around corners.
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It becomes much easier to downshift at the right rpm.
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The truck becomes easier to turn over.
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13.
Which of the following vehicles is most likely to turn over?
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Triple trailer
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65 ft. conventional double
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3 axle tractor semitrailer
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5 axle tractor semitrailer
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14.
On any upgrade, gravity:
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speed you up.
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slows you down.
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doesn't affect your speed.
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doubles your speed.
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15.
Before driving a vehicle with a dual air system, allow time for the air compressor to build up a minimum of ____ pressure in both the primary and secondary systems.
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50 psi
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25 psi
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75 psi
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100 psi
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16.
It may not be safe to operate at legal maximum weights:
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in hot weather.
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on two-way streets.
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during bad weather or in mountains.
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on highways.
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17.
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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loose fuel connections.
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Under-inflated tires and duals that touch.
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All of the above.
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18.
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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19.
Emergency brakes must be held on by:
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dynamic pressure.
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mechanical force.
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hydraulic pressure.
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air pressure.
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20.
A low air pressure warning signal:
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is required on vehicles with air brakes.
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is required on all vehicles without air brakes.
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is optional on vehicles with air brakes.
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None of the above.
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