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Semi Trailer Coupling Safety Quiz

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Questions and Answers

What should you do before coupling a tractor to a semi-trailer?

Hook up the air supply knob to lock the trailer brakes
Push in the trailer air supply valve
Hook up the emergency and service lines before backing under (correct)
Raise the front trailer supports with the crank handle secured in brackets

What should a driver do to prevent a jackknife while driving?

Use the hand valve before the brake pedal
Keep the cargo as low to the ground as possible
Go slow around turns (correct)
Push in the trailer air supply valve

What should a driver do if the fifth wheel locking lever is not locked after the jaws close around the kingpin?

Ignore it and proceed with driving
Fix the coupling before driving a coupled unit (correct)
Try to manually lock the fifth wheel locking lever
Drive away cautiously and monitor the situation

What should a driver do once they have pushed in the trailer supply and before moving the tractor unit?

Wait until the air system is at normal pressure (D) Signup and view all the answers

What should you expect to happen if the trailer breaks away and pulls apart both airlines?

The trailer brake comes on and the tractor protection valve closes (A) Signup and view all the answers

What should be done after coupling to check the connection?

Pulling the tractor ahead gently with the trailer brakes locked (C) Signup and view all the answers

How should you test the tractor semi-trailer connection for security?

By pulling forward gently in a low gear against the locked trailer brakes and then visually inspecting (A) Signup and view all the answers

What should you do to keep dirt and water out of the lines when not towing a trailer?

Lock the tractor glad hands to each other (or dummy couplers) (C) Signup and view all the answers

What must be over the locking lever for a coupling to be complete?

The safety latch for the fifth wheel locking lever (A) Signup and view all the answers

What is used to test the trailer brakes?

The hand valve (C) Signup and view all the answers

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