Q1. Explain the principle of operation of synchronous Motors with a simple sketch. Where are synchronous motor used onboard? (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)
Q1. With Respect to PLC’s used onboard ships:
a) Draw and explain the block diagram of a PLC. (8)
b) Name the onboard ship equipment where PLC’s are used. (4)
c) What are the advantages of PLC controllers over other type of controllers? (4)
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)
Q8.a) CO2 is to be released in engine room in case of fire. Briefly describe steps taken before it can be released.
b) What means are provided to prevent inadvertent release of CO2 in engine room?
Q9. With respect to the hazardous areas of tankers. (a) Explain the term flameproof (Ex d) for electrical equipment. (6) (b) State the type of electrical equipment that would be protected in this way. (5) (c) List likely defects of flameproof equipment. (5)
Q9. With reference to MARPOL Annex I:
a) Draw a 15 ppm oily water separator and explain the principles of operation (8)
b) Periodical maintenance and checks tests required to be done to verify the effectiveness of the above system. (8)
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