For the two straight conical draft tubes A and B, the head loss due to friction in the tube is equal to 0.4 times the velocity head at the outlet. If the inlet to outlet diameter ratio for draft tube A is 0.56 while for draft tube B is 0.71, then which one of the following statements is only correct for the same discharge through the tubes?
1
Draft tube B is more efficient.
2
Draft tube A is more efficient.
3
Both the draft tubes have the same efficiency.
4
Efficiency of the draft tube cannot be determined