Q1. With reference to torsional vibrations in a main propulsion installation based on medium speed engines, gearbox and controllable pitch propeller: Explain how the vibrations may be caused; State the possible effects and damage that could result; Discuss the methods employed to minimise the potential problems associate with torsional vibration; Describe how the natural vibration frequency of the system could be modified.
Q2. Explain why the following problems occur in turbocharger nozzles, shrouds and blades, their effects on turbocharger operation and remedies: – A. Build-up of deposits; B. Hot corrosion; C. Erosion
Q3: A. Sketch and describe a pneumatic control system for controlling temperature of main engine lubricating oil outlet of the cooler; B. Explain why air supplied to the pneumatic control system must be free from dust and water; C. Describe how above impurities are removed; State the consequences if the air supplied is contaminated
Q8. Describe the method of setting the safety valves of an exhaust gas boiler at sea. A. State the limits in terms of percentage above maximum design working pressure for setting safety valves. B. State the formality necessary when Chief engineer sets the safety valves
Q5. A. As 2nd Engineer describe the procedure involved in the complete inspection of a cylinder liner and piston assembly, indicating areas of significant interest; B. Explain with reasons possible faults which might be found; C. Suggest how such faults might be avoided.
Q9. Describe in detail the causes and conditions that; A. Create an explosive atmosphere in a crankcase; B. Initiate a primary explosion. C. Propagate a secondary explosion; State how hazardous conditions can be avoided.
Q3. With reference to large starting air receivers: A. Explain where corrosion is likely to occur and state why it occurs in these regions: B. State the how the incidence of corrosion in air receivers might be minimized; C. If serious corrosion is detected in a starting air receiver and that receiver must be used explain how you, as Second Engineer, would determine the maximum pressure to which the receiver should be subjected; D. State the further action a Chief engineer must take upon discovering such air receiver corrosion.
Q7. In the case of main propulsion engine explain the indications and possible effects which might be expected from- A. Insufficient bearing clearances; B. Excessive bearing clearances; C. Crankshaft misalignment
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