Motor Plants & Auxiliary Boilers USCG Question #1390 (Set 28)

Which of the following statements is true concerning the air starting valve, labeled "III", as shown in the illustration? Illustration MO-0046

USCG Exam Illustration MO-0046
USCG Examination Diagram: Illustration MO-0046
Official USCG Answer & Rule Citation

Correct Answer: Option B — The air starting valve is opened by cam action.

Mechanical or hydraulic timing cams physically lift and open the air starting valves to admit compressed air into the respective cylinders during the correct starting sequence.

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