A swimming pool measuring 10m x 30m x 2m is to be filled with water from an artesian well by a motor pump operating with a total dynamic head of 50m. Assuming an overall motor efficiency of 55%, energy cost of P0.45/kw-hr, find the total cost(P) of energy to fill up the swimming pool. Ans: 66.89 A centrifugal pump delivers 1.7 m3/s of water against a head of 30m when rotating at 1200 rpm. The diameter of its impeller is 45cm. If a pump with the same specific speed is to discharge 6.0 m3/s at 1100 rpm, what is its impeller diameter in cm? Ans: 70.53 A 25m3 tank can be filled with water in one hour by a motor driven pump. Pump efficiency is 90% and motor efficiency is 80%. If the total head is 20m, find the cost(P) of one filling for energy cost of P0.4/kw-hr. Ans. 0.76

Question

A swimming pool measuring 10m x 30m x 2m is to be filled with water from an artesian well by a motor pump operating with a total dynamic head of 50m. Assuming an overall motor efficiency of 55%, energy cost of P0.45/kw-hr, find the total cost(P) of energy to fill up the swimming pool. Ans: 66.89
A centrifugal pump delivers 1.7 m3/s of water against a head of 30m when rotating at 1200 rpm. The diameter of its impeller is 45cm. If a pump with the same specific speed is to discharge 6.0 m3/s at 1100 rpm, what is its impeller diameter in cm? Ans: 70.53
A 25m3 tank can be filled with water in one hour by a motor driven pump. Pump efficiency is 90% and motor efficiency is 80%. If the total head is 20m, find the cost(P) of one filling for energy cost of P0.4/kw-hr. Ans. 0.76