EKM CH 1.0 MAIN AND AUXILIARY ENGINE | MEO 4 & 5
MOTOR ENGINEERING KNOWLEDGE
MEO CLASS 4 & 5 COMBINED
Question Bank by DoS Bangladesh
1.0 MAIN AND AUXILIARY ENGINE
1. (a) With the aid of sketch describe the operating cycle of a two stroke diesel Engine (6)
(b) What is overlapping and why it is necessary. (4)
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2.(a) State the definition of 2-stroke and 4-stroke engine. (4) (b) With the aid of sketch describe the operating cycle of a two-stroke diesel Engine (6)
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3. (a) Draw and describe the purpose of tie bolt in Main Engine (6) (b) With is the effect of running engine with loose tie bolt? (4)
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4. (a) Why tie rod are very close to the center line? (3)
(b) How to check the tightness of tie rod? (4)
(c) What are the functions of tie rod? (3)
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5. (a) Draw a simple diagram of a medium speed diesel engine cylinder liner. (3)
(b) Describe the types of liner wear. (5)
(c) State the maintenance practice to be followed to keep liner wear normal. (2)
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6. (a) Describe with an aid of sketch how piston rings seal the combustion chamber. (4) (b) Brief with sketch different types of piston ring clearance. (4) (c) What is the function of oil scraper ring? (2)
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7. Give the short description on the following: (4 X 2.5) = (10)
(a) Crankcase relief door, (b) Poppet type exhaust valve, (c) Gear teeth backlash, (d) Main engine flywheel markings.
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8. (a) Sketch and describe a marine Diesel Engine starting air system. (7) (b) Describe the safety features used in starting air system. (3)
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9. Describe the causes and effects on engine operation with the following fuel Injector faults: (4 X 2.5) = (10)
(a) Incorrect spring pressure setting,
(b) Nozzle leakage,
(c) Worn nozzle holes,
(d) Slack needle
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10. (a) Draw a simple diagram of a medium speed diesel engine piston complete.(5)
(b) State the cause and effect on engine if the piston running hot for long time. (5)
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11. (a) Draw a complete piston showing the cooling passage. (4) (b) What are the advantages and disadvantages of piston water cooling and oil cooling system? (6)
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12. (a) Why it is necessary to take the liner calibration? (2) (b) State the condition required & procedure to get the correct liner condition. (8)
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13. Describe the causes and effects on engine operation with the following faults: (4 X 2.5) = (10) (a) Broken piston ring, (b) Leaky exhaust valve, (c) Leaky fuel injection valve, (d) Dirty air cooler.
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14. (a) Write down the causes of scavenge fire. (4) (b) What are the actions to be taken in case of scavenge fire? (4) (c) What are the safety devices incorporated in an engine to prevent scavenge fire (2)
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15. (a) Describe the types of crankshaft and give example of their use. (4) (b) What are the causes and indication of crank case explosion? (6)
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16. (a) What is hotspot? (3) (b) Mention 4 areas where hot spot may arise in crank case. (4) (c) What other factors are responsible for crankcase explosion?(4)
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17. (a) What is tappet clearance? Why it should be checked regularly? (4) (b) Describe the causes and effects in case of following condition: (2 X 3) = (6) i) Exhaust valve early opening, ii) After burning in combustion processes.
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18. (a) Describe the reasons and indications of piston crown burning and cracking. (6) (b) Describe the remedy to avoid piston crown burning and cracking. (4)
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19. (a) State the risk assessment for any major overhauling job on diesel engine. (5) (b) What is running in of a diesel engine and why its necessary? (5)
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20. (a) How to prepare a main engine for starting if the engine stops for long time? (5) (b) What are items to be checked if main engine fail to start? (5)
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21. (a) Write down the difference between 2-stroke & 4-stroke engine. (3) (b) State the types of scavenging for large 2-stroke engine. (3) (c) Describe the advantages of uniflow scavenging (4)
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22. (a) What is the purpose of a turbo charger & how it works? (3) (b) What are the causes of turbo charger surging? (3) (c) What are the actions to be taken in case of repeated Turbo charger surging (4)
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23. (a) Draw & describe (3 X 2) (i) Pulse turbocharger system; (ii) Constant pressure turbocharger (b) State the advantage & disadvantage of Pulse and Constant pressure Turbocharger (4)
See answer...24. (a) What is starting air line explosion? (2) (b) What are the causes of starting air line explosion? (4) (c) Describe the safety features used in starting air system. (4)
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25. With reference to exhaust valve explain the advantages of the following: (4 X 2.5) = (10) (i) Nimonic steel for valve head, (ii) Stellite deposit on seat faces, (iii) Roto cap or spring for valve, (iv) Stem seal.
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26. Write short notes on the following: (5 X 2) = (10) (i) Cylinder relief valve, (ii) Air starting valve, (iii) Main engine tachometers (iv) Indicator cock, (v) Camshaft
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27. For perfect combustion in the engine, define the importance of the following: (4 X 2.5) = (10) (i) Viscosity, (ii) Atomization, (iii) Penetration, (iv) Turbulence
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28. (a) What is “Diesel Knock” of the diesel engine? (2) (b) What are the causes of “Diesel Knock” of the diesel engine? (4) (c) What are the causes of black smoke/exhaust of a diesel engine (4)
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29. (a) What is meant by bad combustion of a diesel engine? (2) (b) What are the causes of bad combustion of a diesel engine? (4) (c) State the consequences in case of prolong bad combustion. (4) See answer...
30. (a) Describe the procedure to take the crank shaft deflection. (7) (b) Why it is required to take the crank shaft deflection at regular interval? (3)
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31. (a) Describe how cylinder power & performance can be assessed for a medium speed engine. (7) (b) Describe how individual cylinder power can be adjusted. (3)
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32. What are the merits and demerits of the followings: (2 X 5) = (10) i) Hydraulic governor ii) Electric governor
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33. (a) Draw a line diagram and explain the function of lubricating oil in a diesel Engine (7) (b) What is the purpose of cylinder lubrication? (3)
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34. Describe the following lubrication method used to lubricate bearing in a small high speed diesel engine & large 2 stroke engine: (4 X 2.5) = (10) i) Splash lubrication, ii) Pressure lubrication, iii) Sight feed lubrication, iv) Mechanical lubrication.
See answer...35. (a) Draw a line diagram of main engine fuel oil service system. (6) (b) What is viscosity regulator? (2) (c) Why it is necessary to maintain the viscosity of the engine fuel oil as per the Maker Recommendation. (2)
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36. (a) Sketch a cross-sectional drawing of a lubricating oil cooler. (5) (b) How to find out and rectify the tube leakage in lubricating oil cooler? (5)
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37. (a) Draw a line diagram of a jacket cooling water system of medium speed diesel engines. (7) (b) State the of types chemical dosed in the cooling water and describe the purpose of dosing of each type of chemical.(3)
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