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  What is learning ? To understand unlearning first let us know what is learning process . Learning is two fold process  First step is to See or Observe  It is primary common knowledge about thing  Second step is Detail knowledge about thing which we learn. Let us understand this by example  Suppose we see snake like thing lying on floor. Our primary observation is that  there is some thing which is similar to snake or rope. We are not sure what is it whether it is a rope or snake or something else. This is first step of learning. Further we understand in detail that the snake like thing observed is actually a rope or a snake or some thing else . This is second step of learning.   Practically both steps of learning happen one after another. Many times the time laps between two steps is so small, that we feel both steps are happening at the same time. Let us now understand Unlearning.  Many times while learning we acqui...

                        Common mistakes in Pump selection Normally it is observed that for a particular application pumps are selected by thumb rule or past reference. Excessive Consideration is given to economy of purchase. Many times these two things leads to wrong selection of pumps , high maintenance & high running costs. It is also observed that the suction and delivery pipe line sizes are also mismatch with pump selected and with water flow requirements. This causes very high electrical consumption , higher maintenance and higher operating costs  Considerations In Pump Selection Please check following before finalising pump selection 1. Water consumption in Liters per day 2. Pumping Duration estimate 3. Upper and Lower water tank capacities 4. Total head required based on vertical height from sump to delivery 5. Pipe line lengths ,no of elbow & bends  shall help to estimate f...