CDL Permit Quiz

Combination CDL Questions 2 CDL Test Louisiana
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1. When coupling, the proper position of the fifth wheel is:
  • Level with the ground.

  • Tilted up toward the end the tractor.

  • Tilted down toward the end the tractor.

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2. Where should the tractor be when you inspect landing gear after un-coupling the trailer?
  • With the tractor frame under the trailer.

  • Completely cleared from the trailer.

  • With the fifth wheel directly beneath the kingpin.

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3. If the spring brakes don't release when you push the trailer air supply valve, you should:
  • Check air line connections.

  • Cross the air lines.

  • Check the electrical service cable.

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4. The safety catch for the fifth wheel locking lever must be ________ for a coupling to be complete.
  • over the locking lever

  • straight up

  • through the locking lever

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5. Off-tracking or "cheating" causes which of these to follow the widest path while making a turn?
  • 5-axle tractor towing a 45 feet trailer.

  • 5-axle tractor towing two 27 feet trailers.

  • A bobtail.

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6. When you are uncoupling a loaded trailer, you should lower the landing gear until it:
  • Makes firm contact with the ground, then crank it in low gear a few extra turns.

  • Make contact with the ground and lifts the trailer off of the fifth wheel.

  • Just reaches the ground.

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7. The air leakage rate for a combination vehicle (engine off, brakes on) should be less than _____ psi per minute.
  • 2

  • 3

  • 4

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8. You have a major leak in the service line and you put on the brakes. Service air will escape and cause the:
  • Trailer emergency brakes to come on.

  • Trailer tank pressure to be lost.

  • Tractor spring brakes to lock on.

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9. You will know if the trailer you are driving has antilock brakes by:
  • Yellow ABS malfunction lamps on the left side of the trailer.

  • Red malfunction lamps on the trailer brake cylinders.

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

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10. You have coupled with a semitrailer. Where should you put the front trailer supports before driving away?
  • Raised 1/2 way with the crank handle secured in its bracket.

  • Fully raised with the crank handle secured in its bracket.

  • Raised 3/4 way with crank handle removed.

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11. There are two things that a driver can do to prevent a rollover. They are: (1) Go slow around turns; and (2):
  • Keep both hands firmly on the steering wheel.

  • Keep the cargo as close to the ground as possible.

  • Make sure that the brakes are properly balanced.

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12. When you get ready to back under a semitrailer you should line up:
  • The kingpin to engage the driver's side locking jaw first.

  • Directly in front of the trailer.

  • The left rear outer dual wheel with the kingpin.

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13. While checking if the trailer is securely coupled to the trailer the landing gears should be:
  • Fully raised.

  • Slightly raised.

  • Fully lowered.

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14. You are about to back your tractor under a semitrailer. The trailer is at the right height when the:
  • The kingpin is about 1 1/4 inches above the fifth wheel.

  • The end of the kingpin is even with the top of the fifth wheel.

  • It will be raised slightly when the trailer is backed under it.

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15. In general, the higher the "center of gravity" of your truck, the:
  • Easier it is to turn around corners.

  • More stable it is when turning.

  • Easier it is to turn over.

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16. After the trailer has been coupled to the tractor, the tractor protection control valve should be placed in _____ position.
  • down

  • up

  • normal

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17. When coupling, the proper position of the fifth wheel is:
  • Level with the ground.

  • Tilted down toward the end of the trailer.

  • Tilted up toward the end the trailer.

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18. When uncoupling the trailer, after you have shut off the trailer air supply and locked the trailer brakes, you should:
  • Back up gently to ease pressure on the fifth wheel locking jaws.

  • Immediately put on your tractor parking brakes.

  • Begin to lower the trailer landing gear.

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19. When backing a tractor under a trailer you should:
  • Always use the lowest reverse gear.

  • Always approach the trailer at a slight angle.

  • Do it quickly to ensure that the kingpin is locked into the fifth wheel.

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20. To stop a trailer skid you should:
  • Use the trailer hand brakes.

  • Release the service brakes.

  • Countersteer.

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21. The trailer air supply control valve should automatically close when air pressure falls to between _______ psi.
  • 20 and 45

  • 60 and 85

  • 100 and 125

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22. To unlock the fifth wheel, pull the release handle to the _______ position.
  • neutral

  • closed

  • open

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23. Air lines on a combination vehicles are often colored to prevent them from mixing up. The emergency line is________ ; the service line is ________;
  • red, blue

  • black, yellow

  • blue, red

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24. When checking the trailer's emergency brakes, the tractor protection control valve should be placed in the _______ position.
  • normal

  • emergency

  • neutral

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25. You are driving a combination vehicle when the trailer breaks away, pulling apart both air lines. You would expect the trailer brakes to come on and:
  • The trailer supply valve to stay open.

  • The tractor to lose all air pressure.

  • The tractor protection valve to close.

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26. To unlock the fifth wheel the locking lever should be placed in the _____ position.
  • neutral.

  • closed.

  • open.

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