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Q4.With reference to ships' air conditioning systems:(a) state the effects of EACH of the following faults:

(i) corroded return air trunkings; (2)          (ii) blocked evaporator drains; (2)

(iii) defective capacity control. (2)

(b) state the main health hazard that may arise in the air conditioning plant, stating the conditions that need to arise and the measures that should be taken to prevent this occurring. (4)