In terms of speed of rotation of the impeller N, discharge

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In terms of speed of rotation of the impeller N, discharge Q and change in total head H, through the machine, the specific speed for pump is ____

1. N_s = H^4/3
  N√Q
2. N_s = NQ
  H^4/3
3. N_s = N√Q
  H^4/3
4. N_s = N√Q
  H

Correct Option: C

N_s =	N√Q
	H^4/3