Question

In a pump, suction volume is 25 litres/min and the pump efficiency is 85%. Calculate the shaft power at a pressure of 35kg/cm^2

(a) 2.65 KW

(b) 3.45 KW

(c) 1.67 KW

(d) 1.10 KW

The question was asked in unit test.

I would like to ask this question from Plant Protection Equipments in portion Plant Protection Equipments of Farm Machinery

Answer 1

Right option is (c) 1.67 KW

To elaborate: Water Power = \(\frac{discharge*head}{1000} = \frac{25*9.8}{60}*\frac{35*10}{1000} \) = 1.42 KW

Shaft Power = \(\frac{1.42}{0.85} \) = 1.67 KW