SC CDL COMBINATION PRACTICE TEST
11.
What can cause poor traction?
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Too little weight on the driving axles.
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Too much weight on the steering axle.
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Overloading the truck.
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All of the above.
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12.
When checking the lights before driving:
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the engine must be running.
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you should check them from inside the vehicle.
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make sure the parking brake is not set.
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you should turn off the engine.
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13.
How do you find out how many seconds of following distance you have?
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Wait until the vehicle ahead of you passes a pavement marking, shadow or landmark. Then count off the seconds until you reach the same spot.
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Pass a stationary object and count how many seconds it takes the vehicle ahead of you to reach the same spot.
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Wait until the vehicle ahead of you passes a pavement marking or some other clear landmark, then use the stopwatch on your mobile phone to see how long it takes you to reach the same spot.
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None of the above.
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14.
Poor weight balance:
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improves handling.
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increases fuel efficiency.
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can make vehicle handling more difficult.
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makes it easier to turn.
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15.
How many red reflective triangles should you carry?
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5
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3
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2
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6
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16.
The only way to stop a front-wheel skid is to:
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countersteer.
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let the vehicle slow down.
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supply more power to the drive wheels.
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All of the above.
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17.
An Anti-lock Braking System:
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keeps your wheels from locking when you brake hard.
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increases a vehicle's stopping power.
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increases the distamce required to stop on slippery surfaces.
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lets you brake faster.
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18.
Which of the following is NOT a good rule for using turn signals?
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Signal well before you turn.
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Put your turn signal on after the turn.
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Cancel your signal after you have turned.
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Signal continuously until you have completed the turn.
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19.
The best way to test the trailer service brakes is to:
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pull forward quickly, then apply the trailer brakes with your hand control.
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put the handbrake on when there are no vehicles around you.
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accelerate to the maximum possible speed, then apply the trailer brakes fully.
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None of the above.
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20.
When coupling a tractor to a semi-trailer, after checking if the fifth-wheel is in proper position for coupling you should:
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make sure the area around the vehicle is clear and the trailer wheels are chocked.
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connect the air lines to the trailer.
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connect the electrical cord and check the air lines.
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secure the vehicle.
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