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Q4. A. Describe, with the aid of a sketch, the lubrication systems for a crosshead engine, explaining the Properties required for the lubricating oil in each system;(10)

b. Describe a system which may be used to ensure that the cylinder lubricating oil properties are available for a crosshead engine when changing between fuels (including between fuel oil and gas), stating why it is not desirable to use the same cylinder LO for different fuel specifications (including gas); (6)