Combinations

Question 1

Where should the tractor be when you inspect the landing gear after uncoupling the trailer?
-Completely cleared from the trailer.

-With the tractor frame under the trailer.

-With the fifth wheel directly beneath the
kingpin.

Answer 1

With the tractor frame under the trailer.

Question 2

While driving behind another vehicle, under good conditions, you should allow at least one second between your vehicle and the vehicle ahead for each feet of your vehicle length.
O 10
O 30
O 20

Answer 2

10

Question 3

There are two things that a driver can do to prevent a rollover. They are: (1) keep the cargo as close to the ground as possible and (2):
-Make sure that the brakes are properly adjusted.

-Keep both hands firmly on the steering wheel.

-Go slow around turns.

Answer 3

Go slow around turns.

Question 4

The air brake leakage rate for a combination vehicle (engine off, brakes off) should not be more than psi per minute.
- 1/2
- 2
- 3

Answer 4

3

Question 5

The higher the center of gravity of your truck, the:
-More stable while turning.

-Easier to turn around the corner.

-. Easier to turn over

Answer 5

Easier to turn over.

Question 6

If the service line comes apart while you are driving a combination vehicle, but the emergency line stays together, what will happen right away?
- The emergency trailer brakes will come on.

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

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

Answer 6

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

Question 7

Glad hands are usually connecting which of these?
- Electric lines from the tractor to trailer.

• Service and emergency air lines from the vehicle to the trailer.
• Kingpin from the trailer to the locking jaws of the fifth wheel.

Answer 7

Service and emergency air lines from the vehicle to the trailer.

Question 8

A driver crosses the air lines when hooking up to an old trailer. What will happen?
-If the trailer has no spring brakes, you could drive away but you would not have trailer brakes.

-The hand valve will apply the tractor brakes instead of the trailer brakes.

-The brake lights will come on when the brake pedal is pressed.

Answer 8

If the trailer has no spring brakes, you could drive away but you would not have trailer brakes.