Correct Answer - Option 4 : Maximum
Explanation:
Efficiency of power transmission is given by
\(\eta = \frac{{H - {H_L}}}{H}\)
For maximum efficiency
\({H_L} = \frac{H}{3}\)
We get
\({\eta _{max}} = \frac{{H - \frac{H}{3}}}{H}\)
ηmax = 66.66%
Hence when the flow is such that one third of the static head is consumed in pipe friction, the power delivered by the given pipeline will be maximum.