Questions and Answers
The trailer should be lowered so that...
Which one of the following is controlled by the foot brake?
When you inspect the coupling, check to ensure that...
Air lines on a combination vehicle are often colored to keep them from getting mixed up. The emergency line is ____; the service line is ____.
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After you supply air to the trailer, make sure the air lines are not crossed and the trailer brakes are working. This is done by:
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You have coupled with a semi trailer. In what position should you put the front trailer supports before driving away?
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You are coupling a tractor and semi trailer and have connected the air lines. Before backing under the trailer, you should:
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When you get ready to back under the semi trailer you should line up:
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You are coupling a tractor to a semi trailer and have backed up but are not under it. What should you hook up before backing under?
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The earliest way to notice a trailer skid is...
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Which of these statements is true?
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The hand valve should be used:
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When you are traveling under 40 mph, you should follow other vehicles...
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If you start a trailer skid you should...
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You should not back a tractor under a trailer until the whole air system is:
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If you cross connect the two air lines the following will result...
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When should you use the hand valve to park a combination vehicle?
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Study Notes
Trailer and Tractor Coupling
- Trailer should be slightly raised to properly couple with the tractor for adjustments.
- Ensure air lines are not crossed after supplying air to the trailer system.
- Front trailer supports must be fully raised and secured before driving away.
- Always connect emergency and service air lines before backing under the trailer.
Air Lines and Brakes
- Emergency air line is colored red; service air line is blue.
- The foot brake controls the service air line, essential for regulating brakes.
- Use the hand valve to test trailer brakes; it is crucial for proper braking system checks.
Driving and Skidding
- Light vehicles require less braking power than heavy vehicles, but "bobtail" tractors may take longer to stop.
- In case of a trailer skid, releasing brakes helps regain traction—avoid quick braking.
- Follow vehicles at a distance of one second for every ten feet of vehicle length when traveling under 40 mph.
Safety and Inspection
- Always inspect coupling for slack in air lines and ensure the landing gear is properly handled.
- The earliest sign of a trailer skid is visual, by seeing it in mirrors.
- Normal pressure in the air system is crucial before backing under a trailer; should be at normal pressure before coupling.
Operational Procedures
- Position directly in front of the trailer before backing.
- Test trailer brakes using the hand valve during the coupling process.
- Never use the hand valve for parking; it is reserved for testing and operational scenarios only.
Trailer Handling
- Correctly hooking up air lines is essential to prevent trailer brake failures.
- Careful monitoring and adjustments can prevent accidents during coupling and decoupling phases.
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Description
Test your knowledge on the essential procedures for coupling trailers with tractors, including air line management and braking systems. This quiz also covers safety measures and driving techniques crucial for effective and safe vehicle operation. Ensure that you understand the differences in braking power for different vehicle types and how to handle skidding scenarios.
