CDL DOUBLES TRIPLES PRACTICE TEST SOUTH CAROLINA
11.
Right after it starts to rain, the road is very slippery. Why?
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Because black ice may form on the road.
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Because rain is very slippery.
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Because the water mixes with oil left on the road by vehicles.
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None of the above.
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12.
Brake lag is:
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the time required for the air brakes to work after the brake pedal is pushed.
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the distance your vehicle will continue to travel, in ideal conditions, before you hit the brakes.
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the amount of air pressure required to stop the vehicle.
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the distance your vehicle will travel, in ideal conditions, while you are braking.
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13.
A trailer jackknife is more likely to happen when the trailer is:
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overloaded.
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empty.
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loaded to its full capacity.
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None of the above.
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14.
You are driving a heavy vehicle with a manual transmission, and you have to stop on the shoulder while driving on an uphill grade. When putting your vehicle back in motion up the grade, you should:
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use the parking brake to hold the vehicle until the clutch engages.
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shift down to a speed that you can control without using the brakes.
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keep the clutch slipping while slowly accelerating.
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partly engage the clutch before you take your right foot off the brake.
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15.
How can you tell if a converter dollie has ABS?
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There is an ABS system on the right side of the dolly.
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There is a red lamp on the left side of the dolly.
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There is an ABS plaque on the right side of the dolly.
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There is a yellow lamp on the left side of the dolly.
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16.
To prevent rollover, you should do all of the following except:
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avoid quick lane changes.
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drive slowly around turns.
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keep the load centered on your rig.
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put the lightest parts of the cargo under the heaviest parts.
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17.
If your vehicle has air brakes, to check that air flows to all trailers:
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watch each trailer’s air gauge for a drop of 25 psi.
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go to the rear of the second trailer and open the emergency line shut-off.
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check that the fifth wheel is not so far forward that the tractor frame will hit the landing gear.
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pull gently on the trailer with the tractor.
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18.
How should you brake if your vehicle loses ABS?
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Pump the brake repeatedly
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Brake as you always have.
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Step on and off the brake pedal several times
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Stay off the Brake
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19.
When you turn suddenly, which trailer is most likely to turn over?
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The last trailer of triples
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The rear trailer of doubles
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The front trailer
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None of the above.
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20.
Move-over laws require drivers approaching a stopped emergency vehicle:
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slow and move to a lane not next to the stopped vehicle.
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drive on the shoulder whenever possible.
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increase their speed.
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stop and call for help.
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