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Class 2 (2nd Engineer) MEKG 📅 Sep 2025

Exam Question

With reference to shaft alignment:

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

(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.

Reference Answer

### (a) Fair Curve or Rational Alignment
**Concept:**
Fair curve or rational alignment refers to the practice of deliberately aligning the propulsion shafting and its support bearings along a smooth, continuous curve, rather than a geometrically perfect straight line. This approach is essential to accommodate the various static and dynamic forces acting upon the system, ensuring optimal performance and longevity.
**Purpose and Principles:**

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