ELDT Ch 7 Coupling and Uncoupling

If your fifth wheel isn't greased properly, it can:

• crack the apron.

• create steering problems.

• snap the kingpin.

• both A and B.

If your service line is loose or damaged, you'll:

• suffer a serious leak when you apply the brakes.

• increase your stopping distance.

• drain out your air tanks.

• all of the above.

Backing under your trailer at an angle can:

• push the trailer sideways.

• keep the air lines from getting pinched

• damage/break the landing gear.

• both A and C.

When performing the tug test, when should you stop?

• As soon as you feel resistance from the trailer

• When you hear a squeak from your trailer tires

• As soon as the trailer brakes pop out

• When your spotter gives you the proper hand signal

What is the safest way to lower and raise your trailer's landing gear in high gear?

• Face the trailer and spin the crank handle around your wrist.

• Face parallel to the trailer and use two hands.

• Face the trailer, keep your feet apart, and rest one hand on the trailer.

• Face parallel to the trailer and rest one hand on the trailer.

How can you pull the fifth wheel release handle in a way that doesn't put yourself at risk of injury?

• Bend at the knees, keep your legs and feet clear of the rear tractor wheels, square yourself up with the handle, and pull straight out.

• Pull on the handle with your dominant arm using a zig-zag pattern to loosen the grip.

• Tuck your legs and feet between the rear tractor wheels to get better leverage.

• Grasp the handle with both hands, brace your foot against the tires, and pull.

When positioning the converter dolly for coupling, you should roll the converter dolly up to the front of the rear trailer and stop when:

• the fifth wheel is fully under the trailer apron plate.

• the rear trailer kingpin is about a foot from the jaw opening.

• you hear the pintle hook snap into place.

• the fifth wheel makes contact with the front of the trailer apron plate.

When preparing to couple a rear trailer to a converter dolly, the trailer height should be __________ the center of the fifth wheel.

• the same height as

• slightly lower than

• slightly higher than

• perpendicular to

How can you ease pressure on the fifth wheel locking jaws before uncoupling your tractor-trailer?

• Park on a slight decline when possible

• Chock the trailer brakes

• Lock the trailer brakes and back up gently

• All of the above

When uncoupling the converter dolly, why should you never unlock the pintle hook with the dolly under the rear trailer?

• You can unlock the pintle hook with the dolly under the rear trailer.

• The dolly tow bar could fly up, possibly causing injury.

• The trailer could drop.

• The trailer could start to roll.