Characteristic Curve Q-Efficiency Curve

This curve is Q-Efficiency Curve. Note that this curve increases to the highest point and then drops to certain level and stops.

As we move from point A to B then to C, we can see that efficiency increases to max at point B (this is known as Best Efficiency Point) and then drops. At point A, Efficiency corresponding to q1 is n2 which is less then at point B, where flow q2>q1 but efficiency n1>n2. Also note that efficiency corresponding to point B is maximum. There after, if flow increases, efficiency starts dropping. At point C, flow q3>q2 and efficiency n1>n2. Also we can see that point A and C have same efficiency. Will discuss more about this in later posts.