Combination Vehicles 2 Quiz – Brewsterstransport

Created on October 31, 2023

Combination Vehicles 2

1 / 20

What gear should the tractor engine be in after you uncouple the trailer and are inspecting the trailer supports?

A) Neutral

B) Low reverse

C) High reverse

2 / 20

What is a tractor jackknife?

A) When you lock up the drive tires on the tractor and the tractor spins out sideways as the trailer continues to push forward

B) When you lock up the drive tires on the trailer and the trailer spins out sideways as the tractor continues to push forward

C) Neither of the above

3 / 20

To unlock the fifth wheel, pull the release handle to the _______ position.

A) open

B) neutral

C) closed

4 / 20

You should use chocks when parking a trailer without spring brakes because

A) you don't want the trailer rolling down a hill.

B) some states require chocking of trailer wheels.

C) if the air supply leaks away, there will be no brakes.

5 / 20

An antilock braking system (ABS) is useful

A) only if it is on the tractor and all trailers.

B) only if it is on the tractor.

C) whether it is on the tractor or the trailers.

6 / 20

Where should the tractor be when you inspect the landing gear after uncoupling the trailer?

A) With the tractor frame under the trailer

B) Completely cleared from the trailer

C) With the fifth wheel directly beneath the kingpin

7 / 20

To prevent rollover, cargo should be

A) spread evenly across the trailer(s) and as low as possible.

B) stacked as close to the front of the rig as possible.

C) stacked closest to the doors.

8 / 20

Why should you be sure that the fifth wheel plate is greased as required?

A) To prevent steering problems

B) To ensure good electrical connections

C) To reduce heat and noise

9 / 20

The driver crosses the airlines when hooking up to an old trailer. What will happen?

A) If the trailer has no spring brakes, you can drive away, but you will not have trailer brakes

B) The brake pedal will work the trailer spring brakes instead of the air brakes

C) The hand valve will apply the tractor brakes instead of the trailer brakes

10 / 20

You have coupled with a semi-trailer. In what position should you put the front trailer supports before driving away?

A) Fully raised with the crank handle secured in its bracket

B) Raised half way with the crank handle removed

C) Three turns off the top with the crank handle secured in its bracket

11 / 20

You are coupling a tractor and semi-trailer and have connected the air lines. Before backing under the trailer, you should:

A) Make sure that the trailer brakes are off

B) Supply air to the trailer system, then pull out the trailer air supply knob to lock the trailer brakes

C) Apply the service brakes twice to alert others

12 / 20

If the service airline 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) Nothing is likely to happen until you try to apply the brakes

13 / 20

The air leakage rate for a combination vehicle (engine off, brakes off) should be no more than ____ PSI per minute.

A) 3

B) 2

C) 1

14 / 20

After you supply air to the trailer, make sure the airlines are not crossed and the trailer brakes are working. This is done by:

A) Lifting the brake pedal.

B) Turning on the parking brakes from the cab.

C) Applying and releasing the trailer brakes and listening for brake sounds.

15 / 20

To stop a trailer skid, you should

A) release the brakes.

B) use the trailer hand brakes.

C) Counter steer.

16 / 20

Trucks roll over more easily when fully loaded and are

A) five times more likely to roll over in a crash than empty rigs.

B) ten times more likely to roll over in a crash than empty rigs

C) two times more likely to roll over in a crash than empty rigs..

17 / 20

When coupling a tractor-semitrailer, to test the trailer air brakes, you should place the tractor protection valve control in what position?

A) Up

B) Normal

C) Down

18 / 20

If your vehicle is equipped with dummy couplers, why should you connect the glad hands to them?

A) It will keep dirt and water out of the lines.

B) If you don't, you will never build system pressure.

C) The connected brake circuit becomes a backup air tank.

19 / 20

Describe what the trailer air supply control does.

A) It is used to supply the trailer with air, shut the air off, and apply the trailer emergency brakes.

B) It is a six-sided yellow knob used to control the tractor protection valve.

C) It is a device used to keep the trailer behind the tractor.

20 / 20

he best way to tell if your trailer has started to skid is to

A) feel for "pulling" in the cab.

B) see it in your mirrors.

C) hear the wheels skidding.

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