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10th Grade

30 Qs

quiz-placeholder

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Assessment

Quiz

Others

10th Grade

Practice Problem

Hard

Created by

Rodolfo Vega

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30 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

You should not back a tractor under a trailer until the whole air system is:

At normal pressure

Bled down to half the maximum pressure

Between 60 and 80 psi

Empty

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Before you back under a trailer, make sure the:

Trailer brakes are locked

Trailer protection valve is normal

Air brakes are off

Air supply knob is in

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

You are coupling a semi trailer to your tractor but have not yet backed under. The trailer is at the right height when:

The kingpin is about 1 ½ 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 tractor is backed under it

The trailer landing gear is fully extended

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

You are coupling a tractor to a semi trailer and have backed up but are not under it. What should you hook up before backing under?

Electrical service cable

The emergency and service air lines

The ground cable

The left rear outer dual wheel with the kingpin

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

When you get ready to back under the semi trailer you should line up:

About 12 degrees off the line of the trailer

The kingpin to engage the drivers side locking jaw first

Directly in front of the trailer

The left rear outer dual wheel with the kingpin

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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 emergency tractor brakes will come on

The trailer’s air tank will exhaust through the open line

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

The emergency trailer brakes will come on

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which part of the kingpin should the locking jaws close around?

The shank

The head

The base

It does not matter

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