Q1. What is Zener diode and how does it regulate the voltage? What happens to the series current, load current and Zener current when the d.c input voltage of a Zener regulator increases? Draw a neat diagram of Zener regulator and explain. (16)
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)
Q7. How will you fight a fire in a galley? How will you at least restrict the fire if you are the first person to sight the fire in the galley? (16)
Q7. a) Describe the routine tests required for self-contained breathing apparatus sets (8)
b) Describe the procedure to be adopted to find missing personnel in a smoke-filled accommodation area. (8)
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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