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Q4. With reference to marine diesel engines:

(a) State the purpose of a camshaft. (2)

(b) State TWO methods of driving a camshaft on a large marine diesel engine. (4)

(c) State the speed of the camshaft relative to the crankshaft on:

(i) A four-stroke engine: (2)

(ii) A two-stroke engine. (2)

(d) Sketch a fuel cam for a unidirectional diesel engine indicating EACH of the following:

(i) Point of injection. (2)

(ii) Peak. (2)

(iii) Slow return. (2)