Q1. An auxiliary engine under load continuously fluctuates even with a steady load. The fault you diagnose could be owing to: (16)
(a) The quality of fuel
(b) The quality of servicing of the governor in the last port
(c) The supply of charge air
(d) The overhaul of fuel injectors done in the last decarbonization Give a brief explanation as to why each of the above mentioned points either could be true or cannot at all be the reasons for such a fluctuation.
Q2. Explain the advantages of fitting highly rated medium speed engines with double exhaust and air inlet valves (6)
(b) State the disadvantages of double valve arrangements (4)
(c) Explain the possible causes of persistent burning of exhaust valves if it is:
(i) General to most cylinders (3)
(ii) Specific to a single cylinder (3)
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