Q1. (a) Compare methods of obtaining speed regulation of three-phase induction motor generally used in tankers by means of: (16) i. Rotor resistance. ii. Cascade system. iii. Pole-changing.
Give examples where each system may be employed with advantage.
Q6. (a) Sketch an arrangement showing the principal of a proportional plus Integral (P + I) control loop. (6)
(b) Compare the series and parallel resonance circuits. Find the frequency at which the following circuit resonates. (10)
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 respect to MARPOL 73/78, Annex-ll, Noxious liquid chemicals are divided into categories.
a) State the number of categories, and what does each category signify. (8)
b) State the requirement of procedures and Arrangements Manual, and what information is available. (8)
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