Q2. With regard to the main turbine lubrication oil system:
a) (i) Describe the effects of tin oxide corrosion; (5)
(ii) Explain the actions to be taken if this occurs in a high-pressure turbine thrust bearing. (5)
b) Discuss the factors that determine the various filtration sizes: (6)
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 the top dead centre.
Q3. a) Define the following conditions relating to lubricating oil
(i) Oxidation
(ii) Emulsification
(iii) Acidity
b) Explain how each of the conditions in Q3 (a) is controlled by maintenance
c) Suggest possible consequences if the conditions in Q3 (a) change and no corrective action is taken
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