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Q4. With reference to shaft alignment:

(a) Explain the meaning of fair curve or rational alignment. (8)

(b) Shaft alignment is often verified using hydraulic jacks to obtain a simple graph. Sketch such a graph, indicating the following:

(i) Static load

(ii) Hysteresis

(iii) Influence number

(c) Explain the limitations of checking shaft alignment solely by hydraulic jacking methods. (8)