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Q3. Explain the working principle of differential Pressure Transmitter with the help of diagram and explain the following parts with

their usages. A. Zero and span calibration B. Negative feedback bellow C. Pilot amplifier functions D. Zero Elevation Concept

Q2. a) Sketch and describe a high pressure cut-out in a refrigeration system. (6)

b) The refrigeration compressor has stopped due to operation of the H.P. cut-out.

Explain: (i) The possible causes. (3)

b) How these causes would be found and possible remedies. (3)

c) What steps are taken if the compressor “Short-cycle” on low pressure cut-out? (4)

Q3. (a) Briefly discuss the principle and the key components and Elements of an ICCP system, outlining their function in safeguarding the integrity of metal structures on ships. (8)

(b) Explore the advancements in ICCP technology over the years and how these innovations contribute to more efficient and sustainable corrosion protection. (8)

Q9. (a) What different methods are used for preserving ship’s hull during service. What type of antifouling coats are used.

(b) State what materials are being banned by international regulation for use in Antifouling coats and the reason for banning.

(c) Discuss briefly how does paint coating on deck differ from that on super structure.

Q6. An engine room is operating in the unmanned (UMS) mode, in the event of a failure of the UMS systems explain the arrangements a second engineer officer should introduce to operate the machinery in manual mode for a passage of 10 days’ duration.

Q6. a) Discuss three metallurgical/processing techniques that are employed to enhance the creep resistance of metal alloys. (8)

(b) Define creep and specify the conditions under which it occurs? (8)

Q7. a) Give the approximate composition, and the properties of the following metals:

(i) Manganese bronze, (ii) Cupro-nickel, (iii) Babbitts metal. (8)

In each case give two examples of the metals in use on board ship and explain why the metal is chosen for the applications you mention.

b) Explain the difference between "strength" and "stiffness" of steel. Discuss the importance of these properties in shipboard structural members and machinery.

components. (8)

Q6. With reference to feed regulation: A. Describe, with the aid of sketches, the operation of a boiler feed water regulator controlled by at least two other parameters besides water level in the drum; B. Give reasons for the inclusion of the other elements besides water level in controlling feed flow; C. Deduce the possible effects on the system when the drain valve in the constant leg in the level transmitter starts to leak.

Q2. A. Sketch and describe a Pilgrim Nut for securing a propeller to the screw shaft; B. Describe how this device is used to loosen the propeller on the shaft when removal or inspection becomes necessary; C. Give four reasons why this method is considered to be superior to all other methods.