DieselShip's Online Content Library

Q9. With regards to connecting rod ovality of four stroke diesel Engine.

Explain Following.

a) Importance of connecting rod ovality.

b) Method of measuring the connecting rod ovality.

C) Discuss the impact of ovality if it increases beyond the maximum allowable limit.

d) Method of ascertaining the elongation of connecting rod bolts.

Q1. Describe the starting and reversing system of an electronically controlled diesel engine and compare with engine having CAM SHAFT and explain the following;

A. Reduction in Air Consumption during Engine Starting;

B. Improved performance during Astern starting and Crash Astern

Q4. With reference to Modern Diesel Engine describe the features of High pressure Miller cycle and discuss the following. a) Reduction in Air Temperature due to Miller Cycle b) Recovery of Pressure in the Combustion chamber during the Miller cycle c) Effect of Miller Cycle on specific fuel consumption and NOX emission. d) The impact on various parameters during low load operation using Miller Cycle

Q3. With regards to modern diesel engine raising the Life Cycle Value (LCV). describe the importance of following. a) Low Sac Volume of Fuel Injection Valve b) Fuel Valve opening Pressure regulation c) Contamination of combustion Chamber and impact on LCV d) Contamination of lube oil and impact on LCV.

Q8. How are large slow speed engines structured to withstand the following forces?

A. Forces due to combustion load;

B. Guide forces;

C. Inertia forces.

Q1. Explain the functional and constructional difference between the Torsional and Axial vibration dampers with the help of neat sketches, Explain the function of the side and Top bracing of the main engine.

Q5. a) Describe, with the aid of a sketch, the arrangement of the Gas and liquid fuel systems at the cylinder of a dual fuel 4-stroke engine, stating the input and output signals at the controller.

(b) Describe the arrangement of the gas fuel piping system used for a 4 stroke dual fuel engine with safety features incorporated.

Q3. With reference to 2-Stroke Slow Speed Engine:

A. Sketch and describe Main Engine Exhaust Valve.

B. List out a procedure for test of Main Engine Exhaust Valve after overhaul.

Q4. A. Explain the possible reasons T/C vibration while operating at a steady speed.

B. State how the incidence of turbo charger vibration might be minimized.

C. Explain the action to be taken in order to maintain 2 stroke engine operation in the event of turbo charger having to be taken out of service.

D. Indicate the effect this action will have on engine operation.

{How is the engine operation affected when operated with a by-passed T/C}