Combination 2

Which type of truck trailer combination has the greatest chance of a “crack-the-whip” roll over?

• A tractor pulling three trailers

• A tractor pulling two trailers

• A single tractor trailer

A trailer is most likely to jackknife when it is

• Overloaded.

• Loaded to full capacity.

• Empty.

When backing a tractor under a trailer, you should

• Always use the lowest reverse gear.

• Always approach the trailer at a slight angle.

• Do it quickly to ensure that the king pin is locked into the fifth wheel.

You should not use the trailer hand valve while driving because

• You should use the parking brake.

• Of the danger of making the trailer skid.

• It won’t work as well as the foot brake.

When you get ready to back under the semi trailer, you should lineup

• About 12 degrees off the line of the trailer.

• Directly in front of the trailer.

• The kingpin to engage the driver side locking jaw first.

Which of these vehicles off tracks the most?

• A 5-axle tractor Towing a 45-foot trailer

• A 5-axle tractor towing a 52-foot trailer

• A 5-axle tractor towing a 42-foot trailer

If you do not do the final airbrake check for air leaks and fix them before driving,

• You could lose your brakes while driving

• Your fuel usage will increase

• Tire pressure will drop.

Which of these statements is true?

• Light vehicles need more breaking power to stop that heavy ones.

• Always delay braking a heavy vehicle until you have no other choice.

• “Bobtail” tractors can take longer to stop then a combination vehicle loaded to the maximum gross weight.

You should not use the trailer handbrake to straighten out a jackknifing trailer, because

• The brakes on the trailer wheels will not respond to the handbrake.

• The brakes on the trailer wheels caused skid in the first place.

• The brake handle is too hard to reach.

You wish to turn right from one two-lane, two-way street into another. The truck is too long to turn without swinging wide. You should turn as shown in figure

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