COMBINATION PRACTICE TEST - SC CDL

11. Strong winds can make it difficult to stay in your lane especially when driving:
vehicles with ABS.
heavier vehicles.
flatbed trailers.
lighter vehicles.
12. The wheels of a large combination vehicle are more likely to lock up when:
the trailer has new tires.
you are traveling in very hot weather.
the vehicle is lightly loaded.
the vehicle is heavily loaded.
13. The iron trailer supports are up, and the full weight of the trailer is resting on the tractor. Make sure:
the safety latch is not engaged.
there is enough clearance between the rear of the tractor frame and the landing gear.
you are in a low enough gear.
there is enough clearance between the upper and lower fifth wheel.
14. Combination vehicles have __ air lines.
2
3
4
1
15. When transporting cargo, the cargo should be checked:
before the trip and after the first 150 miles.
only after the trip.
only before the trip.
before the trip and after the first 50 miles.
16. It's important to be sure that the fifth-wheel plate is greased as required. Why?
To reduce heat and noise.
To improve traction.
To prevent steering problems.
To prevent braking problems.
17. When coupling, you should:
make sure the trailer wheels are not chocked.
make sure the sliding fifth-wheel is locked.
be aware that wrong coupling and uncoupling can be very dangerous.
make sure the trailer kingpin is bent.
18. To prevent rollover, you should:
drive slowly around corners.
drive on the shoulder of the road when possible.
turn the engine off while turning.
drive in the left lane.
19. ABS will:
not give you more control over the vehicle during braking.
increase your average speed.
not change your normal braking capability.
shorten your stopping distance.
20. By pushing the trailer air supply control knob in, you:
supply the tires with air.
keeps air in the tractor or truck brake system.
shut the air off and put on the trailer emergency brakes.
supply the trailer with air.
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