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Q1. In an automatic backflushing filter (e.g. for fuel oil or lube oil), what normally initiates a cleaning cycle? (16)

(a) A high differential pressure across the filter, or a preset timer interval, whichever occurs first.
(b) Manual opening of the drain cock by the engineer on watch.

(c) A rise in oil temperature at the filter outlet.

(d) A drop in the oil level of the service tank.

Briefly discuss the operation of an automatic backflushing filter and justify the correct option you chose from the above four.