Q2. A. Describe, with the aid of a sketch, the lubrication systems of a crosshead type diesel engine. (8)
B. Explain the properties required by the lubricating oil in each of the systems described in part (a), stating how these properties compare with those of a lubricating oil used in the crankcase of a trunk piston type diesel engine
Q7. With reference to air compressors for general service use:
(a) Explain the principle of operation of a screw type compressor (4)
(b) Explain the advantages of screw compressors over reciprocating compressors in terms of running and maintenance. (6)
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