IOWA CDL DOUBLES TRIPLES PRACTICE TEST
11.
Too little weight on the driving axles can cause:
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longer stopping distances.
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mechanical damage.
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poor traction.
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12.
Combination vehicles usually require _________ single commercial vehicles.
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the same level of skill as
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more driving skill than
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less driving skill than
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13.
When possible, you should park:
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so you will be able to pull forward when you leave.
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on the shoulder.
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so you will have to back up when you leave.
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14.
If there is a fire and you are not sure what to use to put it out, you should:
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wait for firefighters.
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use a fire extinguisher.
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use water.
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15.
Which of the following is not proper tie-down equipment:
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Chains
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Bungee cords
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Ropes
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16.
To prevent rollover, you should:
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drive faster on ramps and off ramps.
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drive in the left lane whenever possible.
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drive slower around corners.
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17.
For safety during a trip, you should:
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watch gauges for signs of trouble.
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check critical items when you stop.
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All of the above.
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18.
Engine oil pressure should come up to normal within _________ after the engine is started.
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five minutes
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seconds
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two minutes
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19.
The trailer hand valve should:
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never be used for parking.
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be used in driving.
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never be used to test the trailer brakes.
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20.
When you make a quick lane change, the crack-the-whip effect can turn the trailer over. The crack-the-whip effect is caused by:
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the rear trailer of a triple.
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strong wind.
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rearward amplification.
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