ELDT Coupling and Uncoupling 2

Question 1

Before backing under a trailer, where should the fifth wheel plate be positioned relative to the trailer's apron?

Accepted Answer

Slightly lower than the trailer apron

Answer

Exactly level with the apron

Answer

Higher than the trailer apron

Answer

Tilted fully forward and locked

Question 2

What is the correct height for the trailer before backing the tractor under it?

Accepted Answer

So the trailer is raised slightly when the tractor backs under

Answer

Low enough that the tractor frame will hit the trailer

Answer

As high as the landing gear will allow

Answer

Level with the tractor's cab roof

Question 3

When testing the coupling by pulling forward gently against the locked kingpin, this is called a:

Accepted Answer

Tug test

Answer

Brake check

Answer

Roll test

Answer

Air test

Question 4

Which color glad hand or line typically supplies the emergency (supply) air to the trailer?

Accepted Answer

Red

Answer

Blue

Answer

Green

Answer

Yellow

Question 5

What should you do with the tractor parking brake before crawling under to inspect the coupling?

Accepted Answer

Apply it and chock the wheels if needed

Answer

Release it so the truck can roll freely

Answer

Leave it in whatever position it was

Answer

Apply only the trailer brake

Question 6

After coupling, how much space should there be between the tractor frame and the bottom of the trailer?

Accepted Answer

No space at all

Answer

Several inches of gap

Answer

Enough for two hands to fit

Answer

About one foot

Question 7

Where should the kingpin sit in relation to the fifth wheel locking jaws when properly coupled?

Accepted Answer

Locked inside the closed jaws

Answer

In front of the open jaws

Answer

Resting on top of the fifth wheel

Answer

Behind the locking mechanism