Q1. Sketch and describe a main engine shaft driven generator arrangement with an electronic system for frequency correction. (16)
Q2. State the application of the synchronous motors. Discuss how a synchronous motor can function as a synchronous capacitor. Compare synchronous motors with induction motor drives (16)
Q1.a) Explain three methods of overcurrent protection for electrical circuit. (8)
b) Explain with aid of diagram, the meaning of the term inverse current time characteristic (8)
Q4. With respect to Alternators onboard:
a) Briefly explain true power, Apparent power and power factor? (8)
b) The alternator is rated for 750 KVA at 0.85 PF, what is the maximum load (Kilo Watt) that can be put on it? Would you be overloading the alternator if the kilowatt reading were now 620 KW and the power factor 0.80? (8)
Q5. Explain with the help of a neat diagram the operation of a brushless alternator. What would likely happen if one of the rotating Diode fails and becomes: (16)
a) An open circuit?
b) A short circuit?
Q6. With Reference to 3-phase Transformers:
a) Discuss the essential and desirable conditions to be fulfil for operating two three-phase transformers in parallel. (5)
b) What are the advantages of transformer bank of three 1-phase transformers over a unit three phase transformer of the same kVA rating? (5)
c) In a 25 kW, 3300/233V, 1-phase transformer the iron and full load copper losses are 350 watts and 400 watts respectively. Calculate the efficiency at half load 0.8 P. F (6)
Q7. With reference to Maritime Labour Convention (MLC) answer the following:
a) Explain the structure of the convention with titles. (10)
b) Briefly, discuss DMLC Part I and II covering welfare measures for seafarers. (8)
Q8. Explain how PSC is different from FSC/FSI? Discuss Clear Grounds under SOLAS, MARPOL and the STCW with examples. (16)
Q9. Discuss the following with respect to International Safety Management (ISM) code: A. Emergency preparedness, drills and training. (6) B. Reporting of near miss, non-conformities, accidents/incidents and hazardous occurrences. (5) C. Risk assessment, Identification of critical equipment, tests and minimum spares requirement. (5)
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