NV CDL COMBINATION TEST - PRACTICE TEST
11.
To prevent a rollover, you should keep the cargo as close to the ground as possible and:
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make sure that the release arm is in the engaged position.
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keep an eye on your tires.
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keep the vents clear so they work correctly.
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go slowly around turns.
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12.
To test the tractor-semitrailer connection for security:
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go under the trailer and look into the back of the fifth-wheel.
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plug the electrical cord into the trailer and fasten the safety catch.
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pull out the air supply knob.
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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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13.
You are driving a heavy vehicle with a manual transmission, and you have to stop on the shoulder while driving on an uphill grade. When putting your vehicle back in motion up the grade, you should:
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use the parking brake to hold the vehicle until the clutch engages.
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shift down to a speed that you can control without using the brakes.
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partly engage the clutch before you take your right foot off the brake.
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keep the clutch slipping while slowly accelerating.
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14.
When parking a trailer without spring brakes, it is very important for safety that you use wheel chocks. Why?
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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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You may not notice a major leak in the service line until you try to put the brakes on.
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None of the above.
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15.
Brake fade results from, and is affected by:
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excessive heat caused by not relying on the engine braking effect.
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excessive heat caused by using the brakes too much.
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brakes out of adjustment.
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All of the above.
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16.
When you park trailers without spring brakes, you should use wheel chocks:
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to prevent the transmission from shifting up.
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to prevent air from escaping.
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to keep the trailer from moving.
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to prevent overheating.
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17.
The center of gravity of a trailer should be:
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as low as possible.
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at the rear of the trailer.
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as high as possible.
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at the front of the trailer.
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18.
"Bobtail" tractors are:
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tractors without semitrailers.
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heavily loaded trailers.
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tractors with two trailers.
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tractors with a tank.
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19.
If you must stop on a one-way or divided highway, you should place warning devices _______ toward the approaching traffic.
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3, 15 and 45 feet
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5, 50 and 500 feet
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10, 100 and 200 feet
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5, 25 and 50 feet
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20.
What is the emergency air line for?
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It controls the front brakes of the tractor in case of an emergency.
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It tells you the amount of brake pressure you need to stop the vehicle.
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It supplies air to the trailer air tanks, and controls the emergency brakes on combination vehicles.
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All of the above.
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