VA CDL COMBINATION TEST - PRACTICE TEST

11. When uncoupling a trailer, after shutting off the trailer air supply to lock the trailer brakes, you should:
inspect the trailer supports.
back up gently to ease the pressure on the fifth-wheel locking jaws.
pull the tractor forward until the fifth-wheel comes out from under the trailer.
12. Under-loaded front axles can:
cause poor traction.
make the steering axle weight too light to steer safely.
All of the above.
13. Blocking and bracing are:
coupling devices used to connect the service air lines from the truck or tractor to the trailer.
used to keep cargo from sliding and to prevent movement of cargo.
driving techniques used to regain control when your drive wheels start to skid.
14. The posted speed limit:
should only be exceeded when passing other vehicles.
may only be exceeded when driving in rural areas.
should never be exceeded.
15. The heavier the vehicle:
the more work the brakes must do to stop it.
the higher the center of gravity will be.
the less work the brakes must do to stop it.
16. If you let air out of hot tires:
the tires will cool off much sooner.
air pressure will increases, causing the tires to blow out.
as the tire cools, the air pressure will be too low.
17. Which of the following is most likely to roll over?
The rear trailer of a triple
The rear trailer of a double
The front trailer of a double
18. What is the proper following distance for a 50 foot truck traveling at 50 mph?
5 seconds
25 seconds
6 seconds
19. Broken suspension parts can be very dangerous. When inspecting your vehicle for suspension system defects, look for:
Broken leaves in a multi-leaf spring.
Spring hangers that allow movement of axle from proper position.
All of the above.
20. Fully loaded rigs:
are much more likely to roll over than empty rigs.
are less likely to roll over than empty rigs.
are just as likely to roll over as empty rigs.
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