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.
Q3. Sketch and describe a cargo space inert gas system producing washed gas from either a main boiler or from an independent gas generator module. Elaborate the alarms and cut-outs incorporated in the system to prevent any accident.; Explain the various protections for cargo tanks with respect to pressure vacuum build up inside the tanks.
Q4. W.R.T lubrication of reciprocating Freon refrigerating compressor, A. State with reason the characteristic of the lubricating oil in use in such a system, B. Discuss each of the following W.R.T., Cause effect and remedy - i. Copper plating; ii. Freon cloud point; iii. Freon floc point; C. Sketch a ship indirect refrigeration system arranged for cooling containers stowed in stacks in the hold.
Q1. With reference to oil / water separators: A. Describe, will the aid of a sketch, the circuit for an interface detector; B. Explain the consequences if the interface position is incorrect.
Q8. A. Describe a vacuum sewage system B. With reference to the system describe in (A): i. State ONE advantage of the system; ii. State why a holding tank may be required to be fitted to the system; iii. State the problems resulting from the retention of untreated sewage in a holding tank
Q9. With reference to an emergency source of electrical power in passenger ships: - i. Describe a typical power source; ii. Give a typical list of essential services which must be supplied simultaneously; iii. Explain how the emergency installation can be periodically tested
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