CDL Permit Quiz

Combination CDL Questions 1 CDL Test North Dakota
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1. The tractor protection valve will close and the trailer emergency brakes will come on when there is a major leak in the ________ brake line.
  • Service.

  • Parking.

  • Emergency.

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2. You have crashed with another vehicle. What you have to do first?
  • Use reverse gear to back up off the crash.

  • Turn on your four-way flashers.

  • Get out of your vehicle and away from the scene.

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3. You are coupling a tractor to a semitrailer and have backed up but are not under it. What should you hook up before backing under?
  • The emergency and service air lines.

  • The electrical service cable.

  • Nothing. Back up and lock the fifth wheel.

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4. Why should you lock the tractor glad hands to each other (or dummy couplers) when you are not towing a trailer?
  • The connected brake circuit becomes a back up air tank.

  • It will keep dirt and water out of the lines.

  • If you didn't, you could never build system pressure.

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5. After you lock the kingpin into the fifth wheel, you should check the connection by:
  • Pulling forward 50 feet, turning right and then left.

  • Pulling the tractor ahead sharply the trailer brakes to release.

  • Pulling the tractor ahead gently with the trailer brakes locked.

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6. When driving a set of doubles, it is necessary to close the ________ shut-off valve in the last trailer.
  • front

  • mid-section

  • back

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7. What gear should the tractor transmission be in after you have uncoupled the trailer and are inspecting the trailer supports?
  • Neutral.

  • Low reverse.

  • High reverse.

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8. The safest way to make turn without entering another traffic lane is:
  • You should turn wide before you start the turn.

  • You should turn wide as you complete the turn.

  • You should not make a turn and move to another place where you can make a turn without crossing other lane.

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9. You will know if the trailer ABS brakes are NOT working properly by:
  • Yellow ABS malfunction lamps on the left side of the trailer stays ON.

  • Yellow ABS malfunction lamps on the right side of the trailer stays ON.

  • Red malfunction lamps on the trailer brake cylinders stays ON.

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10. Air and electrical lines from the tractor to the trailer should be:
  • Pulled tight, with very little slack.

  • Secured, but with enough slack for turns.

  • Resting on the frame of the tractor.

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11. If your antilock braking system is not working on your trailer, you should:
  • Drive at a lower speed and get the system serviced soon.

  • Not drive until it is repaired.

  • Drive normally, but get the system serviced soon.

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12. Which of these statements is true?
  • The brakes and suspension systems of combination vehicles work best with a light load.

  • Light vehicles need more braking power to stop than heavy ones.

  • "Bobtail" tractors can take longer to stop than a combination vehicle loaded to maximum gross weight.

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13. After connecting the air lines but before backing under the trailer, you should:
  • Supply air to the trailer system, then pull out the air supply knob.

  • Make sure that the trailer brakes are off.

  • Walk around the rig to be sure that it is clear.

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14. Your emergency air line breaks or gets pulled apart while you are driving. The loss of pressure will cause the:
  • Air compressor air to unload instead of pumping.

  • Tractor's air to dump into the trailer tank through the service line.

  • Emergency trailer brakes to come on.

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15. The fifth wheel locking lever is not locked after the jaws close around the kingpin. This means that:
  • The trailer will not swivel on the fifth wheel.

  • The parking lock is off and you may drive away.

  • The coupling is not right and should be fixed before driving the coupled unit.

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16. In normal driving, some drivers use the hand valve before the brake pedal to prevent a jackknife. Which of these statements is true?
  • It should not be done.

  • It results in less skidding than using the brake pedal alone.

  • It is the best way to brake and keep the vehicle in a straight line.

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17. Before you back under a trailer, make sure that:
  • The trailer brakes are locked.

  • The air brakes are off.

  • The air supply knob is in.

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18. When should you use the hand valve to park a combination vehicle?
  • To park at loading docks.

  • To park on a grade.

  • Never.

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19. You should not back a tractor under a trailer until the whole air system is:
  • Empty.

  • At normal pressure.

  • Between 60 and 80 psi.

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20. Which part of the kingpin should the locking jaws close around?
  • The shank.

  • The head.

  • The base.

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21. Off-tracking or "cheating" causes of which of these to follow the wider path while making a turn?
  • Triple towing a 45 feet trailer.

  • Tractor with two 27 feet trailers.

  • 53-feet bobtail.

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22. When you are allowed to get out of your vehicle while backing?
  • When you are unsure of your path of travel.

  • When your trailer begins to drift to passenger side.

  • You should never get out of your vehicle when backing.

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23. The front trailer supports are up and the trailer is resting on the tractor. Make sure:
  • There is enough clearance between the top of the tractor tires and nose of the trailer.

  • There is enough clearance between the tractor frame and the landing gear.

  • Both a and b are correct.

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24. Semitrailers made before 1975 that are equipped with the air brakes:
  • Usually need a glad hand converter.

  • Often do not have spring brakes.

  • Have only a service air line.

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25. Why should you be sure that the fifth wheel plate is greased as required?
  • To ensure a good electrical connection.

  • To prevent steering problems.

  • To reduce heat and noise.

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26. You supply air to the trailer tanks by:
  • Pushing in the trailer air supply valve.

  • Pulling out the trailer air supply valve.

  • Connecting the service line glad hands.

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27. When do you need to use chocks to park a trailer?
  • Never.

  • Always.

  • Only when it will be parked on an incline.

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28. After you have coupled the trailer you should have to raise the landing gear by:
  • Low gear

  • Intermediate

  • High gear

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29. While driving behind other vehicle under good condition you should allow at least one second between your vehicle and the vehicle ahead for each ________ (how many) feet of your vehicle length?
  • 10

  • 20

  • 30

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30. A trailer is most likely to jackknife when it is _______.
  • loaded to full capacity.

  • over loaded.

  • empty.

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31. There are two things that a driver can do to prevent a rollover. They are: (1) Keep the cargo as close to the ground as possible; and (2):
  • Make sure that the brakes are properly adjusted.

  • Keep both hands firmly on the steering wheel.

  • Go slow around turns.

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32. Having antilock brakes on only your trailer:
  • Will give you more control over the vehicle when braking.

  • Will increase the likelihood of a rear wheel power until skid when braking.

  • Will increase the likelihood of jackknifing when braking.

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33. The hand valve should be used:
  • only with a foot brake.

  • to test the trailer brakes.

  • as a parking brake.

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34. After you supply air to the trailer, make sure the air lines are not crossed and the trailer brakes are working. This is done by:
  • Turning on the parking brakes from the cab.

  • Watching your mirrors to see if the trailer lights come on.

  • Applying and releasing in the trailer brakes and listening for brake sounds.

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35. Glad hands are used for connecting the:
  • Electric lines from the tract to the trailer.

  • Kingpin from the trailer to the locking jaws of the fifth wheel.

  • Service and emergency air lines from the vehicle to the trailer.

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36. You are coupling tractor to a semitrailer. You have connected the airlines. Before backing under the trailer you should:
  • Supply air to the trailer system, then pull out the air supply knob.

  • Pull ahead to test the glad hands connections.

  • Make sure that the trailer brakes are off.

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37. A tractor-trailer vehicle combination is most likely to roll over in turn when the configuration includes:
  • a 45 ft. and a 27 ft. trailer.

  • triple 27 ft. trailers.

  • double 45 ft. trailers.

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38. A tractor with a(n) __________ trailer requires the shortest amount of stopping distance.
  • empty

  • lightly loaded

  • fully loaded

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39. The front trailer supports are up and the trailer is resting on the tractor. Make sure:
  • There is enough clearance between the upper and lower fifth wheel.

  • The safety latch is in the unlocked position.

  • There is enough clearance between the tractor frame and the landing gear.

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40. If the service air line comes apart while you are driving a combination vehicle but the emergency line stays together, what will happen right away?
  • The trailer's tank will exhaust through the open line.

  • The emergency trailer brakes will come on.

  • Nothing is likely to happen until you try to apply the brakes.

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41. The air leakage rate for a combination vehicle (engine off, brakes off) should be less than ______ psi per minute.
  • 1/2.

  • 2.

  • 3.

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42. How much space should be allowed between upper and lower fifth wheel after coupling?
  • About 1/4 inch.

  • Just enough to see light through it.

  • None.

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43. Compared to a straight truck or bus, there are _________ things to inspect in combination vehicle.
  • fewer

  • the same number of

  • more

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44. When connecting the glad hands, press the two seals of the couplers together at a _______ degree angle to one another.
  • 45

  • 90

  • 180

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45. Loss of air pressure in the emergency line causes:
  • The relay valves to close.

  • An increase in air pressure to the service brakes.

  • The trailer's emergency brakes to come on.

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46. If you cannot make a turn without enteringanother traffic line, you should:
  • Turn wide as you complete your turn.

  • Not make that turn - go to another place where you won't have to cross into another line.

  • Turn wide before you start your turn.

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47. How should you test the tractor-semitrailer connection for security?
  • Look at it carefully.

  • Rock the trailer back and forth with the trailer brakes locked.

  • Pull gently forward in low gear against the locked trailer brakes then look at it carefully.

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48. Air brake equipped trailers made before 1975:
  • Often do not have spring brakes.

  • Usually need a glad hand converter.

  • Cannot be legally operated on interstate highways.

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49. The earliest and best way to recognize that the trailer has started to skid is by:
  • Seeing it in your mirrors.

  • Feel for "pulling" in the cab.

  • Hear the wheels skidding.

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50. What will happen if the air lines are crossed when you hook up to an old trailer?
  • The hand valve will apply the tractor brakes instead of the trailer brakes.

  • If the trailer has no spring brakes, you could drive away but you would not have trailer brakes.

  • The brake lights will not come on when you press the brake pedal.

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