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Q2. A. Briefly describe the environmental impact of NOx and SOx and allowable limitations as per Annex VI of MARPOL in emission control areas and outside emission control areas.

B. Briefly describe methods to control NOx emission.

Q2. With reference to classification society’s survey, explain the following

A. Why a Class certificate is issued to a newly built ship after satisfactory completion of survey and sea trials, what is the purpose of a Class certificate?

B. Is it necessary to call a Class surveyor after repair or alteration to the ship’s structure If so, why?

C. Describe the requirement for initial and periodical survey respect to International Load Line.

Q9. A. Sketch and describe a vacuum sewage system;

B. List the advantages of the system described in Q9(a).

C. State why untreated sewage should not be allowed to stagnate.

Q4. With reference to fresh water HI-FOG firefighting systems:

a) sketch such a system (7)

b) state how the system in (a) is activated (3)

c) state, with a reason, a suitable location for the above system. (5)

d) List the periodic maintenance to be carried out on the system (5)

Q5.  What is understood by risk on board a ship? As a second engineer discuss various methods for hazard identification and assessment of the risks available on board. (20)

Q6.a) Draw and Explain flammability diagram. (5)

b) What is critical dilution in flammability diagram? (5)

c) How does inert gas reduce flammability range (5)

d) Describe purging and gas freeing operation of cargo tank in Crude Oil Tanker. (5)

Q7. (a) Explain at least three features which assist in the starting of lifeboat engines in cold climate conditions. (5)

(b) Describe two devices that control the rate of fall of a lifeboat when launched from standard davits (5)

(C) Describe the periodic maintenance carried out on lifeboat davit and who are authorized /allowed to carry out these routine jobs as per M.S Notice 1of 2020. (10)

Q8. With respect to refrigeration gases used on-board vessels, answer the following:

a). Explain Ozone Depleting Potential (ODP) and Global warming potential (GWP) of conventional refrigerant gases. (7)

b). Name the alternate refrigerant gases available and being used on board. (7)

c). Explain the steps you will take to ensure that release of refrigerant gases from the plant in minimized during normal operation and during maintenance activities. (6)

Q9. With reference to "emergency preparedness", discuss

(i) Search and rescue; (ii) Evacuation of critically injured personnel; (iii) Helicopter operation; (iv) Rescue from enclosed spaces; (v) Abandon ship (20)