DOUBLES TRIPLES TEST NC - CDL PRACTICE TEST
11.
If the drive wheels start to skid:
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use the brakes to slow down.
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accelerate slightly to regain control.
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push in the clutch to let them turn freely.
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All of the above.
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12.
When more than one semitrailer is behind the tractor:
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the lighter trailer should be in the rear.
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the more heavily loaded trailer should be disconnected.
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The order doesn't matter.
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the more heavily loaded semitrailer should be in the rear.
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13.
Alcohol:
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impairs depth perception.
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improves muscle coordination.
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does not affect judgement.
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improves reaction time.
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14.
If driving a heavy vehicle, you should:
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avoid braking.
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stay in the left lane.
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stay in the right lane.
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try to pass other vehicles going uphill.
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15.
Combination vehicles usually:
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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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are shorter than single than single CMVs.
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All of the above.
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16.
The safety valve is usually set to open at:
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100 psi.
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150 psi.
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200 psi.
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75 psi.
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17.
You are driving a double. Before entering traffic, you should:
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always come to a complete stop.
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make sure you have a large enough gap before entering or crossing traffic.
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turn on your headlights.
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assume there is enough room to merge into traffic.
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18.
To prevent a rollover, the driver should:
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make quick lane changes if possible.
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drive on the shoulder if possible.
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pay extra attention to the coolant level.
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drive slowly around corners, on ramps, and off ramps.
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19.
Which of the following is not a braking system on a truck?
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Parking brake
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Emergency brake
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Steering brake
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Service brake
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20.
You have two tie-downs on a 15 foot load. How many more tie-downs do you need to secure cargo and keep it from shifting or falling?
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One
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Three
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None
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Two
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