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Q2.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)

Q6. a) Describe the working of a single-phase full wave rectifier with a resistive load. Draw the load voltage and current waveforms. (8)

b) Diode half wave rectifier supply a resistive load of 100Ω from a 100 V ac r.m.s voltage source. The diode is a resistance of 5Ω during conduction state. Calculate

i) The DC output voltage

ii) DC average load current (8)

Q7. A. Discuss the rights and expectations of seafarers in relation to occupational safety as per maritime labour conventions. (8)

B. What are the steps taken to reduce discrimination among seafarers due to differences in age, gender, language, nationality, and culture. (8)

Q8. With reference to a lifeboat gravity davit arrangement:

A. Sketch the arrangement showing the lifeboat both in the housed position and at its maximum point of outboard travel. (8)

B. Describe the lowering and raising of life boat stating the safety features and the requirement as per SOLAS 74, with respect to time for hoisting. (8)

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)