CDL COMBINATION PRACTICE TEST (OR)
11.
If your trucks has a high center of gravity, which of the following is true for curves?
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Reduce your speed to a crawl.
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You should slow down, as your truck can roll over at the posted speed limit for the curve.
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You should travel at the posted speed limit.
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None of the above.
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12.
Empty trucks:
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require a shorter stopping distance than full trucks.
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require a greater stopping distance than full trucks.
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require the same stopping distance than full trucks.
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None of the above.
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13.
When you are uncoupling a loaded trailer, lower the landing gear until:
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makes contact with the ground, and leave the trailer off the fifth wheel.
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the pressure in the system is above 55 psi.
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it makes firm contact with the ground.
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the tractor frame is under the trailer.
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14.
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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All of the above.
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15.
When connecting the glad hands, you should press the two seals together with the couplers at a ______ angle to each other.
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90 degree
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30 degree
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180 degree
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45 degree
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16.
Combination vehicles usually:
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are shorter than single than single CMVs.
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are easier to drive 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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17.
To prevent rollover, drivers of combination vehicles should:
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keep the load is to one side.
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make sure the cargo is not centered and spread out.
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brake while turning.
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keep the cargo as close to the ground as possible.
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18.
If your vehicle thumps or vibrates heavily, it may be a sign that:
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the engine belt is loose.
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one of the tires has gone flat.
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you need to shift up.
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the brakes have failed.
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19.
Glad hands are:
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electronic devices.
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warning devices.
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securement devices.
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coupling devices.
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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 unstable load with a high center of gravity.
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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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