Q7. A. Explain how static and dynamic imbalance of crankshafts can be overcome. B. Discuss the methods employed to obtain primary, reciprocating balance in an engine and plain why they are not completely successful. C. Describe engine additions which may be fitted to overcome problems resulting from primary or secondary imbalance.
Q8. a) (i) Describe with the aid of a sketch, one section of a large slow speed engine crankshaft which has been assembled by shrinkage of webs onto journal pins. (4)
(ii) Explain how a five-degree twist might be caused to a shaft assembled by shrinkage. (4)
b) State the possible effects of a five - degree twist in the crankshaft assembly and draw conclusions as to whether the engine should be operated and any adjustments that may be necessary for continued operation. Assume that the incident has occurred at a port with no repair facilities. (8)
Q4. Describe the different types of crankshafts used in marine diesel engines. Highlight their constructional features, materials used, and typical applications. (8)
(b) Compare the advantages and disadvantages of semi-built and solid forged crankshafts with respect to strength, repairability, manufacturing process, and suitability for different engine sizes. (8)
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