EKM-Mar-2021

Q1. 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 vent of turbo charger having to be taken out of service; 

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

Q2.Show with the aid of a sketch how fuel can be continuously circulated through fuel injection valves on large engines while the engine is operating or under, stand-by conditions.

Q3. As a second engineer of a vessel, you are instructed to submit to the superintendent engineer a complete indicator cards together with relevant data. Give full account of your work in taking the cards and preparing them for submission. Tabulate the data you forward, both that extracted from the cards and otherwise obtained, giving typical figures taken from a motor ship.

Q4. With reference to piston rings; A. Analyze the causes of breakage; B. How maintenance and engine operation can minimize breakage; C. Explain the possible consequences with respect to performance and safety of operating the engine with broken or severely worn rings.

Q5.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.

Q6. With reference to medium speed engine cylinder liners: A. Explain the cause and effects of Polishing or glazing; B. Describe, with the aid of sketches, an anti-polishing ring; C. Explain the action of anti-polishing ring during the operation of the engine.

Q7. With respect to large two stroke crosshead main engines; A. Sketch and describe a crosshead designed to prevent or minimize bearing edge loading. B. State how the arrangement describe a achieves its purpose. C. What would be an acceptable range of bearing clearance for the top end bearing and bottom end bearings of a large two-stroke marine diesel engine.

Q8. 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 allowance limit. d) Method of ascertaining the elongation of connecting rod bolts.

Q9. A. Sketch and describe Main engine starting air distributor. 

B. List the safety devices and interlocks incorporated in main engine air starting system and state the purpose of each.