SSC JE Mechanical Engineering 2018 Set 4 Paper

The value of coefficient of discharge in comparison to coefficient of velocity is less.
Coefficient of discharge $\left({\mathit{C}}_{\mathit{d}}\right)$ = Coefficient Of velocity$\left({\mathit{C}}_{\mathit{v}}\right)$ × Coefficient of contraction $\left({\mathit{C}}_{\mathit{c}}\right)$
${\mathit{C}}_{\mathit{d}}=0.9$
${\mathit{C}}_{\mathit{v}}=0.64$