SSC JE Mechanical Engineering 2017 Set 1 Paper

Z2 – Z1 = 6m Efficiency
(n) = 75%
4f = 0.006
Loss of head in the pipe line,
${\mathit{h}}_{\mathit{f}}=\left[\frac{\left(4\mathit{f}\mathit{l}{\mathit{Q}}^2\right)}{\left(3.0257{\mathit{d}}^5\right)}\right]$
${\mathit{h}}_{\mathit{f}}=\left[4\times 0.006\times 6\times \frac{{0.05}^2}{3.0257}{\left(2\right)}^5\right]$
${\mathit{h}}_{\mathit{f}}=77.46\mathit{m}$ Head to be developed by the pump,
h = 77.46 + 6 = 83.46 m
HP required = (WQh/75n)
HP required = 100 × 0.05 × 83.4675 × 0.75 = 74.2 HP