CDL DOUBLES PRACTICE TEST SOUTH CAROLINA
11.
What should you do if you doubt you have safe space to pass under a low bridge?
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Increase the weight of your vehicle to clearing under the bridge.
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If no warnings are posted, assume there is enough clearance under the bridge and proceed slowly.
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Assume that the height posted at the bridges is correct.
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Go slowly, and take another route if you are not sure you can make it.
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12.
If your trailer starts to skid, you should:
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lock the brakes.
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steer in the opposite direction.
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release the brakes.
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pump the brakes.
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13.
When driving with more than one trailer, the _______ trailer should be the first one behind the tractor.
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lightest
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shortest
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longest
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heaviest
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14.
You should always try to back toward the driver's side because:
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you can watch the rear of your vehicle out the side window.
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backing toward the left side is more dangerous.
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you can more easily correct any steering errors.
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None of the above.
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15.
When your vehicle starts to skid, you must take action to:
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use controlled braking.
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use stab braking.
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restore traction to the tires.
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accelerate and countersteer.
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16.
A red triangle with an orange center means:
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The vehicle is hauling hazardous materials
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Slow-moving vehicle
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Law enforcement vehicle
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Liquid tanker
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17.
If a load is 50 feet long, the minimum number of tie-downs required is:
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3
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4
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5
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10
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18.
For safe handling, the heaviest trailer should be:
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the second trailer in a triple.
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the last trailer.
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behind the tractor.
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None of the above.
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19.
Containerized loads are used:
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when transporting liquids.
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when the cargo exceeds the weight limit.
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when transporting explosives.
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when the cargo has been or will be carried by rail or ship.
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20.
Before connecting the converter dolly to the rear trailer, make sure that:
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the trailer height is slightly lower than the center of the fifth-wheel.
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the locking jaws rest on the kingpin.
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the shut-off valves at the rear of the first trailer are open.
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the kingpin rests on the fifth-wheel.
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