COMBINATION TEST MISSOURI - PRACTICE TEST
11.
When more cargo is piled up in a truck, the truck becomes easier to turn over. Fully loaded rigs are _________ to roll over in a crash than empty rigs.
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five times more likely
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three times more likely
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ten times more likely
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12.
When backing a tractor under a trailer:
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the end of the kingpin will be even with the top of the fifth wheel.
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the trailer will be lifted slightly when the tractor backs under it.
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the fifth-wheel will come out from under the trailer.
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13.
The service line is also called:
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signal line or air line.
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control line or signal line.
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pressure line or signal line.
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14.
Antifreeze:
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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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15.
The emergency air line:
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supplies air to the trailer air tanks.
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controls the emergency brakes on combination vehicles.
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All of the above.
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16.
If your vehicle catches fire, you should pull over:
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in an open area.
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at a service station.
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near trees.
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17.
An item that is 15 feet long placed on a flatbed trailer should have at least:
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2 tie-downs.
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3 tie-downs.
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1 tie-down.
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18.
When backing a trailer, if you turn the wheel left:
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the cab will go right and the trailer will go left.
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the cab and the trailer will go left.
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the cab will go left and the trailer will go right.
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19.
What is the emergency air line for?
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It supplies air to the trailer air tanks, and controls the emergency brakes on combination vehicles.
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It tells you the amount of brake pressure you need to stop the vehicle.
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It controls the front brakes of the tractor in case of an emergency.
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20.
When driving a 50 foot combination vehicle at 50 mph in ideal conditions, you should keep at least ____ seconds of space in front of you.
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5
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10
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6
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