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Test Question

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 Watts. Calculate the efficiency at half-full load 0.8 power factor. (10)

Q6. A) Explain the effect of making incorrect phase and starter connections. (6)
b) A 440V shunt motor takes an armature current of 30A at 700 rev/min. The armature resistance is 0.7 Ohm. If the flux is suddenly reduced 20 percent, to what value will the armature current rise momentarily? Assuming unchanged resisting torque to motion, What will be the new steady values of speed and armature current? Sketch graphs showing armature current and speed as functions of time during the transition from initial to final, steady-state conditions. (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, checks and tests required to be done to verify the effectiveness of the above system. (8)

Q9. With reference to “ISM Code” write short notes on:
a) Masters Review (4)
b) Requirement and Advantages of Familiarization of seafarer onboard (4)
c) Designated Person Ashore (DPA) (4)
d) Functional requirements for a Safety Management System. (4)