DISTRICT OF COLUMBIA DOUBLES TRIPLES PRACTICE CDL TEST
11.
If your brakes fail on a steep mountain downgrade, you should:
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go right if the shoulder is clear.
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use an escape ramp if it is available.
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change lanes after making sure there is enough room.
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leave the road immediately.
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12.
A low air pressure warning signal:
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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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is required on vehicles with air brakes.
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None of the above.
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13.
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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14.
As you approach off ramps and on ramps, remember:
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to slow down before you get on the curved part of an off ramp or on ramp.
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that braking and turning at the same time can be a dangerous.
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that the posted speed limit may be safe for automobiles, but may not be safe for larger vehicles.
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All of the above.
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15.
You should be especially alert for drunk drivers:
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in the morning.
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late at night.
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in the early evening.
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around shopping areas.
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16.
As part of your vehicle inspection, you are checking that air flows to all trailers. After using the trailer handbrake to provide air to the service line, you go to the rear of the rig. When you open the emergency line shut-off valve at the rear of the last trailer, you should hear:
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the service line valve close.
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a thumping sound.
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a mechanical vibration.
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air escaping from the open valve.
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17.
Empty trucks:
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have better traction than fully-loaded trucks.
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may have poor traction.
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require shorter stopping distances than fully-loaded trucks.
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None of the above.
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18.
The weight of a truck:
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has no effect on stopping distance.
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has an impact on stopping distance.
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is not as important as the vehicle's center of gravity in determining stopping distance.
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None of the above.
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19.
You are driving a vehicle with air brakes when the low air pressure warning light and buzzer come on. You should:
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slow down and test your brakes.
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activate your hazard lights and drive to the nearest place where you can stop.
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pull off the road and stop immediately.
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apply the brakes as hard as you can.
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20.
After an accident, an improper use of flares could cause:
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the springs to put on the brakes.
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a fire if spilled fuel is on the ground.
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the vehicle to slide back and forth.
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air pressure to build from 50 to 100 psi within 2 minutes.
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