NORTH DAKOTA CDL COMBINATION PRACTICE TEST

11. When you make a quick lane change, the crack-the-whip effect can turn the trailer over. The crack-the-whip effect is caused by:
worn tire tread.
the rear trailer of a triple.
strong wind.
rearward amplification.
12. To be in the proper position for coupling, the fifth wheel should:
be level with the ground.
be tilted down towards the rear of the tractor.
have its jaws closed around the shank of the kingpin.
tilted up towards the rear of the tractor.
13. When driving in a construction zone, if a construction worker is near the road, you should:
maintain a constant speed.
speed up.
come to a complete stop.
further reduce your speed.
14. The best way to recognize that your trailer has started to skid is:
by seeing it in your mirrors.
by opening the window and feeling the front of the mirror.
by recognizing tire failure.
by feeling the brakes come on.
15. An item that is 15 feet long placed on a flatbed trailer should have at least:
15 tie-downs.
3 tie-downs.
1 tie-down.
2 tie-downs.
16. Emergency brakes must be must be held on by:
mechanical force.
the locking mechanism.
water.
air pressure.
17. The use of brakes on a steep downgrade is:
dangerous, and should be avoided at all costs.
the main braking factor.
much more effective than the engine braking effect.
a supplement to the braking effect of the engine.
18. If loose or missing, _______ may cause movement between the frame and fifth wheel assembly.
electric connectors
locking pins
safety chains
mounting bolts
19. You are coupling a tractor to a semi-trailer. After checking the trailer height but before supplying air to the trailer, you should:
inspect the fifth-wheel.
connect the air lines to the trailer.
raise the front trailer supports.
lock the trailer brakes.
20. Cargo tie-downs are used to:
prevent right-turn accidents.
keep cargo from shifting or falling.
prevent skidding.
prevent freezing.
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