CDL Doubles and Triples Practice Test 2

Question 1

What is the correct position of the converter dolly air drain valve during the pre-trip inspection?

Accepted Answer

Fully closed

Answer

Fully open

Answer

Partially closed

Answer

It does not matter

Question 2

Which of the following driving practice is recommended for doubles/triples?

Accepted Answer

Allow more following distance

Answer

Load heaviest semi-trailer in the rear position

Answer

No special driving practices are recommended

Answer

1st and 3rd options

Question 3

What is the correct amount of space between the upper and lower parts of the fifth wheel on the dolly when coupled to a trailer?

Accepted Answer

No space

Answer

1/2 inch

Answer

4/32 of an inch

Answer

Less than one inch

Question 4

What should be inspected on the landing gear for doubles/triples?

Accepted Answer

All the above

Answer

Fully raised with no missing parts

Answer

Crank handle in place and secured

Answer

If power operated, no air or hydraulic leaks

Question 5

Where will you find shut off valves on doubles and triples?

Accepted Answer

[*]Both service and emergency air lines

Answer

Emergency air lines

Answer

Service air lines

Answer

Trailer brake system only

Question 6

If your tractor protection valve malfunctions, what could happen?

Accepted Answer

All of the above

Answer

The emergency brakes can come on

Answer

A leak in the air hose could drain the air

Answer

Air can drain from your trailer brakes

Question 7

What is the proper procedure to test the trailer service brakes?

Accepted Answer

Use trolley valve to apply brakes and check to see if you feel the trailer brakes come on

Answer

Lightly test brakes at low speed

Answer

Repeatedly depress the brake pedal

Answer

Pull out the trailer air supply control

Question 8

Which trailer of a triple trailer is most likely to roll over?

Accepted Answer

The rear trailer

Answer

The front trailer

Answer

The middle trailer

Answer

All the trailers have the same chance of rolling over

Question 9

What is the correct trailer height when you connect the converter dolly to the rear trailer?

Accepted Answer

Trailer is slightly lower than the center of the fifth wheel

Answer

Six inches of space between the fifth wheel and the trailer

Answer

The fifth wheel and the trailer are at the same height

Answer

The trailer is high enough so that it doesn't raise when the tractor is backed under it.

Question 10

Which of the following procedures should you do when connecting the converter dolly to the rear trailer?

Accepted Answer

1st and 3rd options

Answer

Make sure trailer brakes are locked

Answer

Open shut-off valves at rear of last trailer

Answer

Insure that the trailer is slightly lower than the center of the fifth wheel