Q2. Diesel electric propulsion is now being chosen as the power plant for an increasingly wide variety of vessels. (16) a) Sketch a simple layout of such an installation. b) Explain the advantages of selecting such a plant.
Q3. With reference to an emergency source of electrical power in cargo ships: - a) Describe a typical power source. (8) b) Give a typical list of essential services, which must be supplied simultaneously. Explain how the emergency installation can be periodically tested. (8)
Q4. A) Explain the potential hazards if liquid-cooled transformers are used. (6) b) What are the losses in transformers? Mention the various factors which affect these losses. In a 25 KVA, 3300/233 V, single phase transformer, the iron and full-load Cu. Losses are respectively 350 and 400 w. Calculate the efficiency at half-full load 0.8 power factor. (10)
Q9. With reference to MARPOL Annex IV a) Draw a biological sewage treatment plant and explain the principle of operation. (8) b) Periodical maintenance and checks and tests required to be done to verify the
effectiveness of the above system. (8)
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