EKM-Mar-2019
Q1. Describe the phenomena of vibration in marine diesel engine. Explain the terms: (a) Transverse Vibration (b) Torsional Vibration (c) Resonance (d) The role of vibration dampers.
Q2. Sketch and describe the arrangement of a main engine camshaft chain. Describe the repair procedure following fracture of one chain link during operation of the engine. Give possible reasons for the failure and explain how the chain is set initially at the correct degree of tension.
Q3. With respect to control air supply system for Main Engine Control: A. Define the essential conditions, which must be satisfied by the air supply for a pneumatic control system; B. Sketch a control air supply arrangement and give a reasoned explanation for positioning of dryers and filters.
Q4. Describe the procedure of overhauling two-stroke engine stuffing box, without removing piston. All safety precautions to be mentioned. Sketch and show all parts of stuffing box.
Q5. Discuss the significance of cylinder lubrication in two stroke diesel engines considering the impact of Annex VI of Marpol 73/78. Explain a) Two level cylinder lubrication incorporated on few diesel engines. (b) The effect of over and under lubrication on engines.
Q6. Sketch a Main engine air starting distributor and describe how it operates. List the safety devices and interlocks incorporated in main engine air starting system and state the purpose of each.
Q7. Fatigue is one of the main causes of crankshaft failure. A. Sketch and Indicate the most likely location of a fatigue crack; B. How is a fatigue failure is identified; C. Describe initiation of a fatigue crack; D. Sketch and Describe the methods used to inhibit fatigue cracks.
Q8. With reference to mechanical/hydraulic governors: A. Why flyweights are driven at a higher rotational speed than the engine; B. How dead band effects are reduced; C. How hunting is reduced; D. How the output torque is increased.
Q9. 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.
Q2. Sketch and describe the arrangement of a main engine camshaft chain. Describe the repair procedure following fracture of one chain link during operation of the engine. Give possible reasons for the failure and explain how the chain is set initially at the correct degree of tension.
Q3. With respect to control air supply system for Main Engine Control: A. Define the essential conditions, which must be satisfied by the air supply for a pneumatic control system; B. Sketch a control air supply arrangement and give a reasoned explanation for positioning of dryers and filters.
Q4. Describe the procedure of overhauling two-stroke engine stuffing box, without removing piston. All safety precautions to be mentioned. Sketch and show all parts of stuffing box.
Q5. Discuss the significance of cylinder lubrication in two stroke diesel engines considering the impact of Annex VI of Marpol 73/78. Explain a) Two level cylinder lubrication incorporated on few diesel engines. (b) The effect of over and under lubrication on engines.
Q6. Sketch a Main engine air starting distributor and describe how it operates. List the safety devices and interlocks incorporated in main engine air starting system and state the purpose of each.
Q7. Fatigue is one of the main causes of crankshaft failure. A. Sketch and Indicate the most likely location of a fatigue crack; B. How is a fatigue failure is identified; C. Describe initiation of a fatigue crack; D. Sketch and Describe the methods used to inhibit fatigue cracks.
Q8. With reference to mechanical/hydraulic governors: A. Why flyweights are driven at a higher rotational speed than the engine; B. How dead band effects are reduced; C. How hunting is reduced; D. How the output torque is increased.
Q9. 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.
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