Q1. During a loaded sea passage an unusual noise followed by excessive vibrations were experienced in the engine room of your vessel while she was underway. Vessel is fitted with a four-bladed propeller directly coupled to a 2 stroke Diesel engine. Engine room is located aft. After preliminary investigation and from the engine parameters, you have come to the conclusion that propeller has sustained damage. Write a letter to your company reporting this incidence and justification for your conclusion suggesting future course of action.
Q4. During routine soundings, it is found that leakage into a cofferdam is occurring from an adjacent deep cargo oil tank. As Second Engineer state the procedure for directing safe entry by the engine room staff to ascertain the cause of the leakage. If the leakage persists, discuss EACH of the following options as a possible remedy: i) Leave the cofferdam to flood with oil (ii) Flood the cofferdam with sea water (iii) Seal the Cofferdam and pressurize with air (iv) Pump the leakage to bunker tanks.
Q1. Discuss, with reference to the superheater outlet temperature of the main boiler operating at a constant load, the following statements:
a) An increase in excess air will tend to cause a decrease in superheater outlet temperature due to the cooling effect of more air being introduced.
b) A decrease in economizer inlet temperature will tend to cause a decrease in super heater outlet temperature due to the cooling effect of more water being introduced.
c) Badly fouled generating tube banks will cause an increase in the super heater outlet temperature.
d) Excessive amounts of total dissolved solids in the boiler water will cause variations in the super heater outlet temperature
Q6. With reference to hydraulic system for deck machinery identify: A. The types of contamination likely to be found in hydraulic systems for deck machinery; B. The sources of such impurities; C. Means used to prevent problems with contamination; D. Possible effects of the oil contamination on the system.
Q2. A. Describe the procedure to be adopted for the inspection of a safety valve fitted to an exhaust gas fired auxiliary boiler stating, with reasons, which parts should receive particularly close attention.
B. Describe the procedure for the setting of safety valves of exhaust gas operated auxiliary boilers;
C. Explain the required action a watch-keeping engineer should take after the setting of safety valves as in (B)
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.
Q6. A. Explain how and why the performance of reciprocating air compressor tends to “fall off” in service. B. State how “fall off” is indicated and to what extent permissible before correction; C. Describe how optimum performance is restored; D. What is the significance of clearance volume: for reciprocating air compressors.
Q6.a) Define the cause and effect of thermal stressing in cylinder heads, liners, and pistons.
Explain why thermal stressing is aggravated with an increase in the cylinder bore.
Explain how stress concentration and it's effects is relieved by maintenance and operational practices.
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