Q8. Explain why the use of residual fuels for the operation of large slow speed or of medium speed engines, may be responsible for the following problems with turbocharger nozzles, shrouds and blades and how in each, the problem may be minimized:
A. Build-up of deposits.
B. Hot corrosion.
C. Erosion (16)
Q2. The fuel consumption of your ship suddenly increases for no apparent reason, describe how you would investigate the problem and deal with it.
Q3. It has been found that during recent periods of manoeuvring a number of air start value bursting discs or cones have failed - Explain the possible reasons for this; Indolent how the actual cause might be; Detected; Rectified
Q7. Sketch and Discuss the precautions and protections that are provided to minimize the possibility of a diesel engine crank case explosion and the transmission of dangerous flame into the machinery space;
A. By design and equipment; B. By operating personnel
Q2. A. Sketch and describe a control system for maneuvering a main diesel engine from the bridge
B. Explain how local control may be effected in case of breakdown of the control system described in 2 (A).
Q4. Enumerate the causes of vibration in diesel machinery and shafting. Describe procedures by which it may be reduced by operating personnel, suitable design and devices. State the possible effects of vibration on machinery and crewmembers.
Q5. Name the factors an engine designer considers in the selection of the compression ratio for a compression ignition engine. Give some examples of compression ratio values.
Q6. A. State the various types of indicator diagrams that are used to assess engine performance; B. Specify the additional data needed in conjunction with these diagrams; C. Explain, how some abnormalities in indicator diagrams can be traced to the indicator; D. Describe the precautions necessary to avoid indicator malfunctions.
Q6. Give a reasoned opinion as to the accuracy of the following assertions:
a) Absence of oil grooves in the liner wall between the oil supply points results in increased wear of liner and rings.
b) ‘Timed lubrication’ has little merit,
c) The most suitable position of the oil supply point is immediately below the bottom piston ring with the piston at top dead centre.
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