CLP Combination Vehicle Operations 2

Question 1

What is the primary danger of trailer skid (trailer jackknife) in a combination vehicle?

Accepted Answer

The trailer swings outward and can hit other vehicles

Answer

The steering axle loses traction

Answer

The engine overheats from braking

Answer

The fifth wheel disconnects from the kingpin

Question 2

When should you test the trailer brakes using the hand valve (trolley valve) before a trip?

Accepted Answer

At low speed in a safe area before leaving the terminal

Answer

While driving at highway speed

Answer

Only after a full air pressure build-up on the road

Answer

You should never test trailer brakes separately

Question 3

What effect does adding a second trailer (doubles) have on the braking distance compared to a single trailer?

Accepted Answer

Braking distance increases significantly due to added weight and rearward amplification

Answer

Braking distance stays the same as a single trailer

Answer

Braking distance decreases because more brakes are available

Answer

Braking distance is cut in half with a second trailer

Question 4

How do you release the fifth wheel locking jaws to uncouple a trailer?

Accepted Answer

Pull the release handle while the trailer landing gear is down and the truck is slightly under the trailer

Answer

Yank the release handle while driving forward slowly

Answer

Use air pressure to blow the jaws open remotely

Answer

Remove the kingpin with a hammer before pulling the handle

Question 5

What is 'rearward amplification' in a triple combination vehicle?

Accepted Answer

The tendency of the last trailer to sway more violently than the first trailer during a lane change

Answer

The increase in engine noise toward the rear of the combination

Answer

Increased braking force applied to rear axles only

Answer

The amplified signal from the rear brake sensors

Question 6

When coupling a tractor to a trailer, at what height should the trailer nose be before backing under it?

Accepted Answer

Slightly lower than the fifth wheel height so the fifth wheel rides up onto the trailer plate

Answer

At the same height as the fifth wheel

Answer

Higher than the fifth wheel so the trailer slides down onto it

Answer

Height does not matter as long as the kingpin is visible

Question 7

What is the correct procedure if the trailer starts to jackknife during braking?

Accepted Answer

Release the brakes immediately to allow the trailer wheels to regain traction

Answer

Apply more brake pressure to stop the trailer faster

Answer

Accelerate to straighten the trailer

Answer

Steer sharply in the opposite direction of the skid