Q4. With reference to medium speed diesel engine cylinder liners:
a. Explain the cause and effects of polishing and glazing; (6)
b. Explain the action of an anti-polishing ring during the operation of the engine; (5)
c. Describe how effective cylinder lubrication is achieved. (5)
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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