COMBINATION TEST NORTH CAROLINA - PRACTICE TEST

11. The heavier the vehicle:
the higher the center of gravity will be.
the less work the brakes must do to stop it.
the more work the brakes must do to stop it.
None of the above.
12. When driving a 50 foot combination vehicle at 50 mph in ideal conditions, you should keep at least ____ seconds of space in front of you.
4
6
10
5
13. After a tire has been changed, the driver should stop a short while later to:
decrease tire pressure.
deflate the tire to 10 psi.
check the tightness of the nuts.
check tread separation.
14. Before starting down a hill, you should:
look for an escape route.
slow down and shift to a lower gear.
release the accelerator and shift to Neutral at the same time.
apply the brakes hard.
15. When the ______ closes, it stops any air from going out of the tractor.
height control valve
hand valve
alcohol evaporator
tractor protection valve
16. The only way to stop a front-wheel skid is to:
countersteer.
supply more power to the drive wheels.
let the vehicle slow down.
All of the above.
17. Empty trucks:
may have poor traction.
require shorter stopping distances than fully-loaded trucks.
have better traction than fully-loaded trucks.
None of the above.
18. Passive railroad crossings:
usually have a person directing traffic.
do not have traffic control devices.
should never be crossed using a CMV.
have at least one traffic control device.
19. Which of these statements is true?
Trailer skids are more likely to happen when the trailer is empty or lightly loaded.
"Bobtail" tractors can take longer to stop than a combination vehicle loaded to maximum gross weight.
Large combination vehicles take longer to stop when they are fully loaded than when they are empty.
All of the above.
20. When going down grades, you should:
shift up.
downshift to a lower gear.
rely solely on engine braking to reduce your speed.
put the transmission in Neutral.
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