Q1. (a) State FOUR important factors which contribute to the initiation of a scavenge fire. (8)
(b) State the duties of the Engineer Officer of the Watch on discovering a scavenge fire. (8)
2. (a) With reference to combustion within a two-stroke diesel engine, state the effect of EACH of the following:
(i) Early injection. (6)
(ii) Late injection. (6)
(b) Sketch an Out of Phase diagram (draw card) for a two stroke diesel engine. (4)
Q3. With reference to a main engine jacket water cooling system:
(a) Explain, with the aid of sketches, how the jacket water temperature is maintained at its optimum value. (8)
(b) State the possible effects on the engine if the jacket water temperatures are maintained outside the desired value. (8)
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)
Q5. With reference to boiler feed water systems:
a) Describe the relationship between density and relative density. (4)
b) Describe what is meant by total dissolved solids (TDS). (4)
c) Explain why a high TDS is detrimental to a steam plant system, and how it is controlled. (4)
d) State TWO faults that may cause the total dissolved solids to reduce. (4)
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