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Q7. 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)