CDL COMBINATION PRACTICE TEST IOWA
11.
The heavier the vehicle:
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the less work the brakes must do to stop it.
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the higher the center of gravity will be.
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the more work the brakes must do to stop it.
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12.
Enough tread is especially important in winter conditions. You need at least ________ tread depth on steering axle tires.
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4/32 inch
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6/24 inch
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2/8 inch
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13.
The parking brake:
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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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should be used whenever you park.
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14.
When you turn suddenly while pulling doubles, which trailer is most likely to turn over?
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The rear trailer is twice as likely to turn over as the tractor.
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All trailers are equally likely to turn over.
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The front trailer is twice as likely to turn over as the tractor.
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15.
When approaching a vehicle with a distracted driver, you should:
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maintain your safe following distance.
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change lanes quickly.
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quickly pass the vehicle.
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16.
If you smell exhaust fumes in the cab, you should:
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remember to conduct a post-trip inspection.
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open the windows.
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stop immediately.
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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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stay in the left lane.
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try to pass other vehicles going uphill.
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18.
Which of the following makes a rollover more likely?
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Weight that is loaded so there is a high center of gravity.
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If the load is to one side so it makes a trailer lean.
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All of the above.
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19.
When driving in very hot weather, the heat will increase the chances of:
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ABS malfunction.
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loss of hydraulic pressure.
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tire failure.
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20.
If the drive wheels begin to spin when accelerating, you should:
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take your foot off the accelerator.
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brake gently.
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continue to accelerate.
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