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)
Q3. With reference to batteries onboard:
a) Distinguish between ‘Lead acid cell’ and ‘Alkaline cell’ (6)
b) Describe how a battery of alkaline cells may be tested for its usefulness, after a long storage and if found deficient, how it can be remedied? (6)
c) Explain how the ambient temperature is taken into account when determining the condition of the battery (4)
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)
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)
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