OK CDL COMBINATION PRACTICE TEST
11.
To prevent rollover, drivers of combination vehicles should:
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brake while turning.
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keep the cargo as close to the ground as possible.
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keep the load is to one side.
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12.
The trailer hand valve should be used only:
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when the trailer is fully loaded.
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in driving to prevent skids.
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to test the trailer brakes.
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13.
Which of the following is NOT part of testing the tractor protection valve?
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Stepping on and off the brake pedal several times to reduce the air pressure in the tanks.
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Charging the trailer air brake system.
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Pulling forward slowly, then applying the trailer brakes.
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14.
When you use your mirrors while driving on the road, you should:
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only use the driver's side mirror.
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check them quickly.
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avoid checking them regularly.
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15.
Cargo should be properly covered:
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to protect the weather from the cargo.
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to block your view or someone else’s.
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to protect people from spilled cargo.
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16.
The posted speed limit:
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should never be exceeded.
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may only be exceeded when driving in rural areas.
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should only be exceeded when passing other vehicles.
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17.
If you must stop on a one-way or divided highway, you should place warning devices _______ toward the approaching traffic.
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5, 50 and 500 feet
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5, 25 and 50 feet
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10, 100 and 200 feet
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18.
ABS will:
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shorten your stopping distance.
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not change your normal braking capability.
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increase your average speed.
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19.
Do not use the trailer hand valve in driving because:
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the trailer emergency brakes will come on.
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of the danger of making the trailer skid.
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All of the above.
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20.
If your trailer starts to skid, you should:
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pump the brakes.
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release the brakes.
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steer in the opposite direction.
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