01. When should you use the hand valve to park a combination vehicle?

a. To park at loading docks.
b. To park for less than two hours.
c. To park on a grade.
d. Never.

02. You have coupled with a semi-trailer. Where should you put the front trailer supports before driving away?

a. Raised 1/2 way with the crank handle secured in its bracket.
b. Raised 3/4 way with the crank handle removed.
c. Fully raised with the crank handle secured in its bracket.
d. 3 turns off the top with the crank handle secured in its bracket.

03. You supply air to the trailer tanks by:

a. pushing in the trailer air supply valve.
b. pulling out the trailer air supply valve.
c. connecting the service line glad hand.
d. applying the trailer hand valve.

04. 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?

a. The electrical service cable.
b. The emergency and service air lines.
c. The ground cable.
d. Nothing, back up and lock the fifth wheel.

05. 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?

a. The emergency tractor brakes will come on.
b. The trailer's air tank will exhaust through the open line.
c. The emergency trailer brakes will come on.
d. Nothing is likely to happen until you try to apply the brakes.

06. A driver crosses the air lines when hooking up to an old trailer. What will happen?

a. The hand valve will apply the tractor brakes instead of the trailer brakes.
b. The brake pedal will work the trailer spring brakes instead of the air brakes.
c. If the trailer has no spring brakes you could drive away but you wouldn't have trailer brakes.
d. The brake lights will not come on when the brake pedal is pressed.

07. In normal driving, some drivers use the hand valve before the brake pedal to prevent a jackknife. Which of these statements is true?

a. It should not be done.
b. It results in less skidding than using the brake pedal alone.
c. It lets the driver steer with both hands.
d. It is the best way to brake and keep the truck in a straight line.

Answers: (1)d   (2)c   (3)a   (4)b   (5)d   (6)c   (7)a