CDL COMBINATION PRACTICE TEST (RI)

11. When more cargo is piled up in a truck, the truck becomes easier to turn over. Fully loaded rigs are _________ to roll over in a crash than empty rigs.
three times more likely
ten times more likely
five times more likely
12. You are coupling a semi-trailer to your tractor but have not yet backed under. The trailer is at the right height when:
it will be raised slightly when the tractor is backed under it.
the end of the kingpin is even with the top of the fifth wheel.
the locking jaws are around the head of the kingpin.
13. At speeds below 40 mph, you should leave at least one second in front of you for each ___ feet of vehicle length.
20
5
10
14. Strong winds can make it difficult to stay in your lane, especially when:
going into tunnels.
coming out of tunnels.
driving at speeds below 40 mph.
15. In vehicles with air brakes, the tractor protection valve:
provides the air pressure used to operate trailer brakes.
carries air, which is controlled by the trailer hand brake or the foot brake.
keeps air in the tractor or truck brake system.
16. What factors can cause brakes to fail or fade?
Brakes out of adjustment
Excessive use of the service brakes
All of the above.
17. Which of the following is NOT part of testing the tractor protection valve?
Charging the trailer air brake system.
Stepping on and off the brake pedal several times to reduce the air pressure in the tanks.
Pulling forward slowly, then applying the trailer brakes.
18. The first thing to do when coupling a tractor-semitrailer is to:
lock the trailer brakes.
check the trailer height.
inspect the fifth wheel.
19. When backing a trailer, you should:
pull-up frequently to reposition the vehicle.
turn the steering wheel toward the direction you want to go.
not back up in a straight line.
20. When inspecting the cargo, make sure it is:
piled up.
secured properly for the first 50 miles after beginning a trip.
not overloaded.
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