What is the proper position of the converter dolly air tank drain valve during operation?

a.Open to allow moisture to drain

b.Closed

c.Partially open

d.It depends on the weather conditions

Explanation

The converter dolly air tank drain valve must be closed during operation. If left open, air will escape and the dolly brakes will not function properly. Drain the air tank during regular inspections, but always close the valve before driving.

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About the CDL Exam

The CDL (Commercial Driver License) exam tests your knowledge of commercial driving rules, safety procedures, and vehicle operation. You must score 80% or higher to pass the written knowledge test. The exam covers general knowledge, air brakes, combination vehicles, and various endorsements.

This question is from the Double/Triple Endorsement Test #1 section. Practice with more questions from this category to build confidence before taking the official DMV test.

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