GA CDL COMBINATION PRACTICE TEST
11.
Empty trucks:
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require the same stopping distance than full trucks.
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require a shorter stopping distance than full trucks.
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require a greater stopping distance than full trucks.
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None of the above.
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12.
What is a pull up when referring to truck driving?
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A specific maneuver used to decelerate smoothly in the exit lane.
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When a driver stops and pulls forward to get a better position.
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A driving maneuver used to pull your vehicle over to the side of the road and stop.
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Using the speedometer to know when to shift up.
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13.
The crack-the-whip effect:
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the ends of some vehicles to drag.
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can cause problems for drivers coming toward you.
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can cause a vehicle to tilt.
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can turn the trailer over.
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14.
Under a pressurized system, the radiator cap:
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should never be removed until the system has cooled.
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should always be cool.
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should be removed when the coolant is hot.
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should never be hot.
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15.
The emergency air line does NOT:
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cause the tractor protection valve to close when the emergency line loses pressure.
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control the emergency brakes on combination vehicles.
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supply air to the trailer air tanks.
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pump air into the relay valves, allowing the trailer brakes to be applied more quickly.
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16.
To test the tractor-semitrailer connection for security:
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pull out the air supply knob.
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plug the electrical cord into the trailer and fasten the safety catch.
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check that the trailer is locked onto the tractor by pulling the tractor gently forward while the trailer brakes are still locked.
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go under the trailer and look into the back of the fifth-wheel.
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17.
If your trailer starts to skid, you should:
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use the trailer hand brake (if you have one) to straighten out the rig.
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keep the rear of your vehicle close to the curb.
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accelerate slightly.
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release the brakes to get traction back.
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18.
What is a tractor jackknife?
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When the wheels of a trailer lock up, and the trailer swings around.
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When the rear wheels of a trailer lock up, and the tractor swings around.
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When a drive-wheel skid lets the trailer push the towing vehicle sideways.
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None of the above.
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19.
To avoid rollovers, you should drive slowly:
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on ramps.
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around corners.
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off ramps.
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All of the above.
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20.
Which of the following makes a rollover more likely?
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If the load is to one side so it makes a trailer lean.
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Weight that is loaded so there is a high center of gravity.
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Turning too fast.
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All of the above.
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