### Specific Speed of Centrifugal Pump

The specific speed of a centrifugal pump is defined as the speed of an imaginary pump, identical with the given pump, which will discharge 1 liter of water, while it is being raised through a head of one meter. Mathematically, specific speed,

The ranges of specific speeds for different types of pumps are given in the following table.

 Type of pump Slow speed with radial flow at outlet Medium speed with radial flow at outlet High speed with radial flow at outlet High speed with mixed flow at outlet High speed with axial flow at outlet Specific speed in r.p.m. 10 - 30 30 - 50 50 - 80 80 - 160 160 - 150

1. for high speed with axial flow at outlet, kindly check for the specific speed, it's 160-250.

### Are Engineers Favourite Among Girls?

What do girls think about men who are engineers and what type of engineers are most favourite among girls? A survey was conducted by a team of aboutmech with members chosen from different countries. Each team member carried out a neutral survey in his/ her country to evaluate what females think about most of the engineers from different engineering branches. An overview of different questions asked in survey is given below: Question: Which male engineers do you find more attractive as a husband? Almost 50% women voted for mechanical engineers to be the most attractive husbands among other engineers. So mechanical engineers are most favourite among girls as a husband. They find them more trustworthy, intelligent, and creative. A married women from California said, “If your husband is a mechanical engineer, he will help you in everyday tasks. Because mechanical engineers are good team players and they have creative ideas about everything.” Which male engineers do you find more