Q9. A report on the analysis of the main crosshead engine crankcase lubricating oil indicates the following contaminants or property changes. In EACH of the following cases give reasons for the possible causes of the contamination or property change, explaining how the actual cause would be detected; .
A. The presence of fresh water; B. White metal fragments; C. Reduced alkalinity reserve; D. Reduced anti oxidation reserve.
Q9. a) Define the following conditions relating to lubricating oil
(i) Oxidation
(ii) Emulsification
(iii) Acidity (6)
b) Explain how each of the conditions in Q9 (a) is controlled by maintenance (5)
c) Suggest possible consequences if the conditions in Q9 (a) change and no corrective action is taken (5)
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.
Q1. 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)
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
(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
Q3. State, with reasons, THREE properties required for a cylinder lubricant for a main engine operating on HFO.
(b) Describe, with the aid of a sketches, an electronically controlled cylinder lubrication system, stating how the timing and quantity of cylinder lubricant is regulated and set.
Q2. Periodical Lubricating Oil Analysis, its correct interpretation and corrective measures are of critical significance for the maintenance of marine machineries. With reference to the modern analysis techniques employed for the condition of L.O, discuss the following:
A) Elemental (Spectrometric) Analysis
B) Fourier Transform Infrared (FTIR) Spectroscopy
C) Particle Count
D) Base Number Vs Acid Number
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