Q4. How is fuel oil injected into the cylinder of a heavy oil two stroke cycle internal combustion engine and how is it ignited? Show by a timing diagram at what point of stroke injection of the fuel begins and ends. Name the engine to which your answer refers. Explain the effect of advancing the timing of injection on: i. Fuel per brake horse power hour; ii. Exhaust temperature; iii. Cylinder maximum pressure
Q9. i) Describe what is nozzle burning of fuel Injectors and causes of nozzle burning on Marine Diesel engine. (6)
ii) What investigations are required to find causes for nozzle burning? (6)
iii) What actions are required to reduce the risk of Nozzle Burning? (4)
Q9. a) Describe how fuel injector components deteriorate with time? (6)
b) What are effects of deterioration of fuel injector components? (6)
c) What are the signs of a bad injector? (4)
Q5.a) In Jerk type Fuel Pump, describe with diagrammatic sketch how metered quantity of fuel oil is delivered to cylinder unit? (8)
b) How is fuel injection timing changed in Jerk type Fuel pump? (4)
c) Describe effect of fuel injection time alteration on the performance of unit. (4)
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