COMBINATION PRACTICE TEST - VA CDL

11. An Anti-lock Braking System (ABS):
keeps your wheels from locking up when you brake hard.
lets you drive faster.
increases your normal braking capability.
12. 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.
lock the trailer brakes.
connect the air lines to the trailer.
13. When backing a trailer, turn the wheel right to make the cab go ________ and the trailer go ________.
right; left
left; right
left; left
14. When inspecting the coupling, make sure ________ between the upper and the lower fifth-wheel.
there is at least 1 foot
there is no space
there are at least 36 inches
15. A steering wheel should have no more than _____ of play. If there is more play than this, it may be hard to steer.
15 degrees
10 degrees
30 degrees
16. One way to prevent hydroplaning is to:
have less than 4/32 inch tread depth in every major groove on front tires.
take curves at higher speeds.
make sure you have enough tread on your tires.
17. You are coupling a tractor to a semi-trailer. You have backed up but are not yet under the trailer. Before backing under the semi-trailer, you should:
supply air to the trailer system and lock the trailer brakes.
connect the electrical cord and check the air lines.
begin raising the landing gear.
18. Before entering a curve, you should:
increase your speed.
maintain your speed.
reduce your speed.
19. Weight that is loaded so there is a high center of gravity:
makes a vehicle easier to handle.
causes greater chance of rollover.
reduces the chance that the load will shift to the side or fall off.
20. When you get ready to back under the semi-trailer, you should:
line up directly in front of the trailer.
back under the trailer at an angle to avoid pushing the trailer sideways.
line up about 15 degrees off the line of the trailer.
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