COMBINATION TEST MINNESOTA - PRACTICE TEST
11.
If there is a cargo fire in a van or box trailer, you should:
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keep the doors shut.
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keep driving until you reach help.
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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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12.
Off-tracking is:
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when the tires lose their contact with the road and have little or no traction.
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when a vehicle makes a turn and the rear wheels of the trailer end up driving in a different path than the tractor and the front wheels of the trailer.
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when a vehicle towing a trailer skids, and the trailer pushes the towing vehicle from behind until it spins the vehicle around.
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None of the above.
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13.
After the pre-trip inspection, drivers should inspect their cargo and its securing devices again within ________ after beginning the trip.
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two hours
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25 miles
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20 miles
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50 miles
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14.
When should you use the hand valve to park a combination vehicle?
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Always.
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Never.
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When parking downhill.
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To park at loading docks.
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15.
When uncoupling a trailer, after shutting off the trailer air supply to lock the trailer brakes, you should:
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immediately apply your tractor parking brakes.
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pull the tractor forward until the fifth-wheel comes out from under the trailer.
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inspect the trailer supports.
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back up gently to ease the pressure on the fifth-wheel locking jaws.
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16.
A trailer jackknife is more likely to happen when the trailer is:
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empty.
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loaded to its full capacity.
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overloaded.
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None of the above.
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17.
Antifreeze:
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doesn't help the engine in any way.
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helps the engine only when the temperature is below freezing.
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helps the engine only under hot conditions.
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helps the engine under hot conditions as well as cold conditions.
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18.
What happens when the center of gravity of a truck moves higher up from the road?
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The vehicle is more stable while turning.
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It is easier it is to turn around corners.
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The truck becomes easier to turn over.
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It becomes much easier to downshift at the right rpm.
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19.
Hydroplaning:
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only happens when tire pressure is higher than normal.
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never occurs at speeds below 40 mph.
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can occur at speeds as low as 30 mph.
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only occurs at extremely high speeds.
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20.
You are driving a modern truck with a manual transmission. When going down a hill you should usually:
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use the same gear you would use to go up the hill.
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shift into neutral and coast.
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downshift after your
speed has already built up.
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use a lower gear than would be required to go up the hill.
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