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Q2. With reference to Air conditioning systems onboard for accommodation spaces:

a) Sketch and explain a fully automated air conditioning system, annotating the relevant temperatures and relative humidity’s throughout the system. (12)

b) Explain how bacteria are prevented from growing in an air conditioning system to a dangerous degree. (4)

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. (6)

Explain: (i) The possible causes.

ii) How these causes would be found and possible remedies.

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

Previously Asked As

Q8. With reference to Air-conditioning system onboard your vessel:

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

(b) The refrigeration compressor has stopped due to operation of the h.p cut-out Explain.

(i) The possible cause.

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

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

Q3. (a) Briefly discuss the principle and the key components and elements of an ICCP system, outlining their functions 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)

Q4. (a) What different methods are used for preserving ship’s hull during service. What type of Antifouling coats are used. (8)

(b) State what materials are being banned by international regulation for use in Antifouling coats and the reason for banning. (4)

(c) Discuss briefly how does paint coating on deck differ from that on super structure. (4)

Q5. 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. (16)

Q2. a) Define creep and specify the conditions under which it occurs? (8)

b) Discuss three metallurgical processing techniques that are employed to enhance the creep resistance of metal alloys (8)

- - - PREVIOUSLY ASKED - - -

Q2. a) Define creep and specify the conditions under which it occurs? (6)

b) Discuss the various metallurgical processing techniques that are employed to enhance the creep resistance of metal alloys (10)

Q7. Explain EACH of the following metallurgical processes:

(a) Induction hardening (4)

(b) Nitriding (4)

(c) Case hardening (4)

Q8. 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. (8)

b) Give reasons for the inclusion of the other elements besides water level in controlling feed flow. (4)

c) Deduce the possible effects on the system when the drain valve in the constant leg in the level transmitter starts to leak. (4)

Q9. A. Sketch and describe a Pilgrim Nut for securing a propeller to the screw shaft. (8)

B. Describe how this device is used to loosen the propeller on the shaft when removal or inspection becomes necessary. (4)

C. Give reasons why this method is considered to be superior to all other methods. (4)