CDL COMBINATION PRACTICE TEST UTAH
11.
If you unlock the pintle hook with the dolly still under the rear trailer:
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your vehicle might roll away.
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steam and boiling water can spray under pressure.
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the brakes could be damaged by the combined forces of the springs and the air pressure.
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the dolly tow bar may fly up.
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12.
If there is a cargo fire in a van or box trailer, you should:
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keep driving until you reach help.
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keep the doors shut.
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enlist the help of bystanders.
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open the doors, especially if your cargo contains hazardous materials.
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13.
The parking brake:
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should be used whenever you park.
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should be used when you need to apply the brakes firmly.
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should be used when driving in bad weather.
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All of the above.
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14.
Under-loaded front axles can:
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cause the drive wheels to spin easily.
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make the steering axle weight too light to steer safely.
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cause poor traction.
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All of the above.
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15.
What is the proper following distance for a 40 foot truck traveling at 35 mph?
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12 seconds
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10 seconds
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4 seconds
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5 seconds
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16.
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 never be hot.
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should be removed when the coolant is hot.
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should always be cool.
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17.
When you are driving on a slippery road, you should NOT:
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use the engine brake or speed retarder.
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adjust turning and braking to road conditions.
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keep a longer following distance.
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take curves at slower speeds.
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18.
When transporting cargo, the cargo should be checked:
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before the trip and after the first 50 miles.
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only before the trip.
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only after the trip.
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before the trip and after the first 150 miles.
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19.
The center of gravity of a trailer should be:
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at the rear of the trailer.
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as low as possible.
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at the front of the trailer.
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as high as possible.
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20.
When the trailer breaks away or develops a bad leak, the tractor protection valve will close automatically and:
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the engine will shut down.
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the trailer supply valve will stay open.
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the trailer emergency brakes will come on.
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the tractor will lose all air pressure.
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