Question 33Steam Plants - Assistant Engineer

70% to pass

When operating with the auxiliary feed line, feed water flow is controlled _______________.

Aautomatically by the main feed water regulator
Bmanually by throttling the auxiliary feed stop-check valve
Cmanually by adjustment of the auxiliary feed water regulator spring setting
Dautomatically by the economizer bypass
AI Explanation

The correct answer is B) manually by throttling the auxiliary feed stop-check valve. When operating with the auxiliary feed line, the feed water flow is controlled manually by adjusting the auxiliary feed stop-check valve. This allows the operator to precisely control the amount of feed water entering the boiler, as the main feed water regulator is not active in this mode of operation. The other answer choices are incorrect because: A) the main feed water regulator is not in control when using the auxiliary feed line, C) the auxiliary feed water regulator spring setting is not adjusted to control flow, and D) the economizer bypass does not automatically control feed water flow in this scenario.

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Official Resources
46 CFR Machinery & Electrical 46 CFR Engineering USCG National Maritime Center
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