Exam Question

### 1. Introduction
The matching of an induction motor to a centrifugal pump for main circulating duty is a critical engineering task to ensure reliable, efficient, and safe operation. The objective is to select a motor that not only provides the required power at the design duty point but also possesses the necessary torque characteristics to start the pump, accelerate it to operating speed, and handle potential system fluctuations without stalling. This involves a detailed analysis of both the pump's hydraulic characteristics and the motor's electromechanical characteristics.
### 2. Centrifugal Pump Characteristics
The performance of a centrifugal pump is defined by a set of characteristic curves, typically provided by the manufacturer, which plot Head (H), Power absorbed (P), and Efficiency (η) against the Flow Rate (Q) at a constant rotational speed.