If V1 and V2 are the velocities of water at inlet and outlet of the draft tube respectively, then the efficiency of a draft tube is

(V¬¨‚â 1¬¨‚â§ - V2¬¨‚â§) / V1¬¨‚â§

V1¬¨‚â§ / (V1¬¨‚â§ - V2¬¨‚â§)

If V1 and V2 are the velocities of water at inlet and outlet of the dr

1.	If V1 and V2 are the velocities of water at inlet and outlet of the draft tube respectively, then the efficiency of a draft tube is
A.	(V¬¨‚â 1 - V2) / V1
B.	(V¬¨‚â 1¬¨‚â§ - V2¬¨‚â§) / V1¬¨‚â§
C.	V1 / (V1 - V2)
D.	V1¬¨‚â§ / (V1¬¨‚â§ - V2¬¨‚â§)
Answer» C. V1 / (V1 - V2)