CDL COMBINATION PRACTICE TEST VIRGINIA
11.
When looking at your cargo covers in the mirrors while driving, you must be aware that a flapping cover:
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can tear loose, uncovering the cargo.
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keeps the cargo cool.
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helps keep the cargo as close to the ground as possible.
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12.
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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a mechanical vibration.
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the service line valve close.
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air escaping from the open valve.
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13.
Which of these is NOT part of the basic method for shifting up?
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Release the accelerator, push in the clutch and shift to neutral at the same time.
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Push in the clutch and shift to the higher gear at the same time.
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Accelerate while pressing the clutch and turn toward the driver's side.
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14.
_________ rigs are much more likely to roll over in an accident than _________ rigs.
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Empty ; fully loaded
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Fully loaded ; overloaded
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Fully loaded ; empty
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15.
A bridge formula permits:
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less maximum axle weight for axles that are far apart.
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more maximum axle weight for axles that are closer together.
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less maximum axle weight for axles that are close together.
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16.
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 doubles
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The last trailer of triples
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17.
If driving a heavy vehicle, you should:
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stay in the right lane.
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try to pass other vehicles going uphill.
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stay in the left lane.
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18.
Before driving a vehicle with a dual air brake system, you should allow time for the air compressor to build up a minimum of ____ pressure in both the primary and secondary systems.
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100 psi
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150 psi
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50 psi
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19.
When the tractor protection valve closes, the trailer _______ brakes will come on.
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service
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parking
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emergency
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20.
If your vehicle is equipped with air brakes, loss of air pressure in the emergency line will cause:
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the vehicle to slide back and forth.
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the springs to put on the brakes.
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the trailer emergency brakes to come on.
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