ALABAMA CDL DOUBLES TRIPLES PRACTICE TEST
11.
It may not be safe to operate at legal maximum weights:
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in hot weather.
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on highways.
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on two-way streets.
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during bad weather or in mountains.
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12.
When parking a trailer without spring brakes, it is very important for safety that you use wheel chocks. Why?
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You may not notice a major leak in the service line until you try to put the brakes on.
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if you don't use wheel chocks, supply air will be sent to the service line instead of going to charge the trailer air tanks.
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The air could leak out of the trailer air tank, releasing its emergency brakes.
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None of the above.
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13.
Air pressure should build up in a single air system, within about:
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10 minutes.
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15 minutes.
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1 minute.
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3 minutes.
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14.
The tractor protection valve:
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works the trailer brakes.
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supplies air to the trailer air tanks.
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keeps air in the tractor brake system should the trailer break away or develop a bad leak.
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controls the emergency brakes on combination vehicles.
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15.
When should you be particularly careful about high winds?
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When driving at night
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When emerging from a tunnel
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When going downhill
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When driving in winter
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16.
Empty trucks require _____ stopping distances because empty vehicles have ______ traction.
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less; less
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greater; less
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less; more
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greater; more
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17.
Which of the following statements is true?
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Poor cargo ventilation is a common cause of fire.
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There is no way that short circuits due to damaged insulation can cause a vehicle fire.
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Under-inflated tires will NOT cause a vehicle fire.
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Carrying a properly charged and rated fire extinguisher will help prevent fires.
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18.
Brake lag is:
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the amount of air pressure required to stop the vehicle.
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the time required for the air brakes to work after the brake pedal is pushed.
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the distance your vehicle will travel, in ideal conditions, while you are braking.
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the distance your vehicle will continue to travel, in ideal conditions, before you hit the brakes.
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19.
To test your parking brake, do the following:
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Speed up to 5 mph, then set the parking brake.
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Set the parking brake, and gently pull against it in a low gear.
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Set the parking brake while going downhill.
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Speed up to 15 mph, then set the parking brake.
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20.
Doubles and triples:
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can be turned suddently due to the low center of gravity.
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have a lower chance of skidding.
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can't be turned suddenly.
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can be stopped suddenly due to their weight.
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