Double-Triple Trailers Sample Test A
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Double-Triple Trailers Sample Test A

1. If your trailer has started to skid, what should you do to get traction back?
A Release the brakes. Don't use the trailer handbrake.
B Press harder on the brake pedal to stop the vehicle faster.
C Set the trailer handbrake.

2. What is it called when the rear wheels follow a different path than the front wheels when a vehicle goes around a corner?
A A close fit.
B Offtracking.
C Crack-the-whip effect.

3. What are two reasons why doubles and triples take up more space than other commercial vehicles?
A They are longer and they cannot be turned or stopped suddenly.
B They are longer and weave from side to side.
C They are longer and are taller than tractors.

4. In allowing more space, what should you do before entering or crossing traffic?
A Move quickly because you have a deadline.
B Because of the large size of your vehicle expect others to see you and make room for you.
C Make sure there are large enough gaps before entering or crossing traffic.

5. What is a reason why there is more chance of skids with doubles and triples in bad weather, slippery conditions and mountain driving?
A Your drive wheels provide security for the pulling unit only.
B Your front wheels may not be equipped with brakes.
C You have more length and more dead axles to pull.

6. When can you use the trailer hand valve for parking a combination vehicle?
A Always.
B When the emergency brake is not working.
C Never.

7. In normal driving should you ever use the trailer hand valve before the brake pedal to prevent trailer skids?
A Always
B When the brake pedal does not work.
C Never.

8. Which valve keeps air in the tractor or truck if the trailer breaks away or develops a bad leak?
A The one-way check valve.
B The relay valve.
C The tractor protection valve.

9. If the tractor protection valve closes, letting air out of the trailer emergency line, which brakes should come on?
A The trailer handbrake.
B The trailer emergency brakes.
C The brakes on the front axle.

10. What happens when you push in the trailer air supply control knob and what happens when you pull it out?
A Push it in to supply the trailer with air. Pull it out to release all air to the trailer.
B Pull it out to release all air to the trailer. Do not push it in when the vehicle is underway.
C Push it in to supply the trailer with air. Pull it out to shut the air off and put on the trailer emergency brakes.


Score =
Correct answers:






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