GATE Mechanical Engineering (ME) 2018 Shift 1 Solved Paper

An electrochemical machining (ECM) is to be used to cut a through hole into a $12\mathit{m}\mathit{m}$ thick aluminum plate. The hole has a rectangular cross-section, $10\mathit{m}\mathit{m}\times 30\mathit{m}\mathit{m}$ The ECM operation will be accomplished in 2 minutes, with efficiency of $90\%$. Assuming specific removal rate for aluminum as $3.44\times {10}^{-2}{\mathit{m}\mathit{m}}^3/$ (As), the current (in A) required is ________-(correct to two decimal places).