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Q6. Write short notes on the following:

(a) The need for taking double bottom tank soundings regularly after a grounding incident. (4)

(b) Need to pre-heat main engines prior to continuous running of the engine. (4)

(c) Utility of pressure gauges on either side of high-pressure fuel oil filters. (4)

(d) The purpose of opening indicator cocks before blowing through an engine. (4)