FL CDL COMBINATION PRACTICE TEST

11. If you are being tailgated, you should:
increase your following distance.
move to the left lane.
flash your brake lights.
speed up.
12. If you unlock the pintle hook with the dolly still under the rear trailer:
your vehicle might roll away.
steam and boiling water can spray under pressure.
the dolly tow bar may fly up.
the brakes could be damaged by the combined forces of the springs and the air pressure.
13. Which of these statements is true?
Large combination vehicles take longer to stop when they are fully loaded than when they are empty.
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.
All of the above.
14. Combination vehicles have __ air lines.
1
4
3
2
15. Headlights:
can blind other drivers.
should not be used when driving at night.
should be out of adjustment.
must be turned on a half hour before sunset to a half hour after sunrise.
16. When the trailer breaks away or develops a bad leak, the tractor protection valve will close automatically and:
the trailer supply valve will stay open.
the tractor will lose all air pressure.
the engine will shut down.
the trailer emergency brakes will come on.
17. Enough tread is especially important in winter conditions. You need at least ________ tread depth on steering axle tires.
8/32 inch
2/8 inch
6/24 inch
4/32 inch
18. "Bobtail" tractors are:
tractors with two trailers.
heavily loaded trailers.
tractors with a tank.
tractors without semitrailers.
19. If your truck has automatic transmission, you should downshift:
whenever road conditions allow.
when going down grades.
when you need to accelerate.
after entering a curve.
20. Empty trucks have the best braking. True or False?
True.
False.
It depends on the cargo.
It depends on the truck.
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