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Q7.a) Describe how A. E, crankshaft deflections are measured. (6)

b) State how the measurements can be checked for accuracy. (5)

c) Specify with reasons other checks that should be made on the crankshaft. (5)

Q5. Discuss the consequences of failure to maintain correct clearances in the case of auxiliary diesel engine crankshaft and bottom end bearing. Describe the procedure of taking crankshaft deflection (16)

Q3. (a) What are the different types of crankshaft used in marine diesel engines? (10)

(b) Discuss the various factors affecting the failure of crankshafts in marine diesel engine (6)

Q8.a) Describe the procedure for measuring crankshaft deflection in a marine engine. Include the steps for preparing the engine, positioning the deflection guage and recording measurements at different crank angles. (8)

b) Explain how to interpret the deflection data to assess the condition of the crankshaft. What do variations in deflection readings indicate about alignment, bearing wear or potential engine stresses. (8)

Q4. (a) Draw simple sketch of a crank shaft, with names of the different parts of the crank shaft (8)

(b) Describe function on crankshaft of 2-stroke diesel engine (4)

(c) Describe fittings on crank shaft for various operation of main engine (4)

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)

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.

Q1. (a) Describe the procedure for taking crankshaft deflection of Auxiliary Engine, explaining all precautions that must be observed (8)

(b) Explain what deflection readings actually mean and suggest the action which must be taken should readings be outside values recommended by the engine manufacturer. (8)

Q2. a) With reference to crankshafts and piston crowns outline the main stresses to which these parts are subjected. (4)

b) In each case explain how the stresses are generated and how they very in magnitude and direction during one cycle. (6)

c) With respect to the whole engine, describe how stresses may be accommodated by good design and influenced by poor maintenance. (6)

Q3. a) What is crank web deflection and purpose of measuring the same? (4)

b) How crank web deflections are taken, describe the process. (6)

c) Describe the process to locate faulty main bearing by taking crank web deflection measurement. (6)

Q3. a) What is crankshaft misalignment? (4)

b) What are the reasons for crankshaft misalignment? (8)

c) What is the effect on main engine of such misalignment. (4)

Q5. i) Name different types of crank shaft by construction methods. (6)

ii) show different parts of Fully built Type Crankshaft and describe assembling process to complete the crankshaft. (6)

iii) What are materials used for each part. (4)