Doubles and Triples Test

Questions 1 to 5 of 16

You are driving a set of doubles. A set of trailer wheels goes into a skid. Which of these is most likely to occur?
- The rig will continue to move in a straight line no matter how much the steering wheel is turned.
- You will have a trailer jackknife
- The rig will stay in a straight line but slide sideways
Before you can supply air to the air tanks of a second trailer you need to:
- Open the shut off valves at the rear of the first trailer, and close the shut off valves at the rear of the second trailer
- Close the shut off valves at the rear of the trailers
- Open the shut off valves at the rear of both trailers
To check that the converter dolly is securly coupled to the rear trailer, you should:
- Release the spring brakes and check for movement
- Pull gently against the pin of the second semitrailer
- Back up slightly and make a visual check of the coupling
When you drive a set of double or triple trailers, you need more space because they:
- Are wider than single vehicles
- Can't be stopped or turned quickly
- Have more axles
Which of these actions is not a good thing to do when driving on slippery roads?
- Use the engine brake or speed retarder
- Keep other traffic out of your side space
- Use a light touch on the accelerator and brake pedals

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