Exam Question
(a) How will you align a motor-pump shaft? What are the different methods of alignment generally used? (8)
(b) Why is the Refrigeration Compressor often belt driven? (8)
Class 4 (4th Engineer)
MEP
📅 Oct 2025
Reference Answer
### (a) Motor-Pump Shaft Alignment & Methods
**1. Objective of Alignment**
The primary objective of shaft alignment is to ensure that the rotational centerlines of the two machines (motor and pump) are collinear when the machines are running under normal operating conditions (i.e., at normal operating temperature and load). Proper alignment is critical to prevent premature failure of bearings, seals, and couplings, and to minimize vibration and power loss.
**2. Types of Misalignment**
**1. Objective of Alignment**
The primary objective of shaft alignment is to ensure that the rotational centerlines of the two machines (motor and pump) are collinear when the machines are running under normal operating conditions (i.e., at normal operating temperature and load). Proper alignment is critical to prevent premature failure of bearings, seals, and couplings, and to minimize vibration and power loss.
**2. Types of Misalignment**
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