CDL Combination Vehicles Practice Test 2

Question 1

When backing a combination vehicle, why is it always better to back to the driver's side?

Accepted Answer

You can watch the rear of your trailer through the side window

Answer

It is required by federal law

Answer

It keeps the trailer wheels off the shoulder

Answer

It reduces fuel consumption while reversing

Question 2

What is offtracking in a combination vehicle?

Accepted Answer

When the rear wheels follow a tighter path than the front wheels in a turn

Answer

When the trailer brakes lock before the tractor brakes

Answer

When the trailer drifts sideways on ice

Answer

When the fifth wheel slides out of position

Question 3

To avoid hitting an object on the right when turning a corner with a long combination vehicle, you should:

Accepted Answer

Turn wide as you start the turn

Answer

Turn wide as you complete the turn

Answer

Back up before turning

Answer

Keep the trailer wheels on the curb

Question 4

What does a converter dolly with a single axle and no brakes of its own rely on for stopping?

Accepted Answer

The brakes of the trailers it connects

Answer

Its own spring brakes

Answer

Engine compression only

Answer

A separate air tank

Question 5

Which trailer should be loaded first and placed closest to the tractor in a doubles combination?

Accepted Answer

The heaviest trailer

Answer

The lightest trailer

Answer

The trailer with the converter dolly

Answer

Either, weight does not matter

Question 6

When uncoupling, before you disconnect the fifth wheel you should:

Accepted Answer

Release the trailer air supply and lower the landing gear

Answer

Drive forward sharply

Answer

Disconnect the air lines first only

Answer

Raise the landing gear fully

Question 7

A 'kingpin' is the part of a combination vehicle that:

Accepted Answer

Locks into the fifth wheel of the tractor

Answer

Connects the brake chambers

Answer

Holds the landing gear in place

Answer

Secures the mud flaps