OREGON DOUBLES TRIPLES PRACTICE CDL TEST
11.
The tractor protection valve:
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controls the emergency brakes on combination vehicles.
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supplies air to the trailer air tanks.
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works the trailer brakes.
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keeps air in the tractor brake system should the trailer break away or develop a bad leak.
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12.
Which of the following is most likely to roll over?
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The rear trailer of a double
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The rear trailer of a triple
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The front trailer of a double
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The middle trailer of a triple
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13.
Air pressure should build up in a single air system, within about:
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3 minutes.
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10 minutes.
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1 minute.
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15 minutes.
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14.
If your ABS fails:
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you will have no brake function, and could lose control.
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your tires might grab unexpectedly and you could lose control.
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you will still have normal brake functions.
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the first step is to get the vehicle off the road and stop.
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15.
To prevent rollover, you should:
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keep the cargo as close to the ground as possible.
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put the lightest parts of the cargo under the heaviest parts.
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place the cargo near the rear of the trailer.
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place the cargo near the front of the trailer.
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16.
Pre-trip inspections of doubles and triples should:
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be done by the shipper.
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take less time than inspecting straight trucks.
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be done once a week.
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take more time than inspecting straight trucks.
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17.
When you back under a trailer:
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back the tractor slowly.
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make sure the trailer brakes are locked.
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use lowest reverse gear.
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All of the above.
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18.
Combination vehicles usually:
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are easier to drive than single than single CMVs.
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are shorter than single than single CMVs.
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require more driving skill than single CMVs.
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All of the above.
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19.
Which of the following is not a braking system on a truck?
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Emergency brake
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Steering brake
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Service brake
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Parking brake
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20.
Hanging meat in a refrigerated truck can be:
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a very stable load if properly distributed.
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a very stable load with a low center of gravity.
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a very unstable load with a low center of gravity.
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a very unstable load with a high center of gravity.
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