Q1. With respect to energy efficient running of ships, comment on optimization of propeller-hull interface, flow devices and improvement of propulsion efficiency.
Q2. Discuss the advantages and disadvantages of adopting the following for maintenance of main and auxiliary engines - A. Planned maintenance; B. Condition monitoring; C. Periodic replacement of components.
Q2. With reference to the carriage and pumping of liquefied gas cargo:
A. Sketch a suitable pumping system labelling the component parts;
B. State;
i) Why submerged hydraulically driven pumps are not used;
ii) How overheating of pump drive shaft bearings is avoided;
C. State, how the risk of fire and explosion in cargo tanks is obviated both in the loaded and discharged condition.
Q6. With reference to electro-hydraulic steering gears:
A. Explain in terms of control parlance, the function of the “Hunting gear”;
B. Explain the consequences if the standby pumping unit is motored;
C. State TWO methods employed to prevent the standby hydraulic pump being motored by the operating unit.
Q8. With reference to oil/water separators:
A. Describe with the aid of a sketch, the working of such a separator. (6)
B. Explain the consequence if the interface detector position is incorrect. (5)
C. Enumerate the various possibilities by which oil / water interface can be moved. (6)
Q6. A. State, with reasons, the causes of fatigue cracking of engineering components; B, State, with reasons how material and design defects can influence fatigue life. C. With reference to engine bed plate transverse girders explain how the incidence of fatigue cracking can be minimized.
Q9. (a) For Freon-22 vapor compression refrigeration machine, state how each of the following faults are indicated and how they are remedied:
(i) Air in the system
(ii) Moisture in the system
(iii) Undercharge
(iv) Overcharge
(b) Describe with a diagram detailing the devices incorporated into the refrigeration system to protect the machinery and equipment against malfunction.
Q8. 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.
Q9. Write short notes i. optical and ii. Acoustic methods of non-destructive testing
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