CO CDL DOUBLES TRIPLES PRACTICE TEST
11.
To make the brakes work, air brakes use:
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hydraulic air.
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nitrogen.
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compressed air.
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carbon monoxide.
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12.
Most heavy duty vehicles use ___ air brake systems for safety.
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reduced
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single
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dual
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triple
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13.
When you double your speed, the braking distance is:
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2 times longer.
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3 times longer.
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the same.
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4 times longer.
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14.
If your trucks has a high center of gravity, which of the following is true for curves?
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Reduce your speed to a crawl.
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You should travel at the posted speed limit.
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You should slow down, as your truck can roll over at the posted speed limit for the curve.
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None of the above.
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15.
When preparing to make a right turn, you should NOT turn wide to the left as you start the turn. Why?
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It makes the turn harder.
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A following driver may try to pass you on the left.
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A following driver may try to pass you on the right.
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Turning wide to the left can cause your vehicle to tilt.
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16.
When driving in heavy traffic, the safest speed is:
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half the speed of the other vehicles.
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faster than the other vehicles.
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the same speed as the other vehicles.
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slower than the other vehicles.
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17.
To prevent rollover, you should:
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drive in the left lane whenever possible.
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drive slower around corners.
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drive faster on ramps and off ramps.
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All of the above.
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18.
Which of the following will off-track the most?
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The rear wheels of the last trailer.
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The front wheels of the tractor.
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The rear wheels of the tractor.
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The front wheels of the last trailer.
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19.
If during vehicle inspection a tire is too hot to touch, you should:
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immediately decrease air pressure.
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let air out.
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make sure there is enough engine oil on the tires.
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remain stopped until the tire cools off.
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20.
If you unlock the pintle hook with the dolly still under the rear trailer:
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steam and boiling water can spray under pressure.
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the dolly tow bar may fly up.
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the brakes could be damaged by the combined forces of the springs and the air pressure.
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your vehicle might roll away.
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