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GATE ME 2018 Set 1 — Question 65

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NAT+2 / -0MediumNon-Traditional MachiningMachining & Machine ToolsManufacturing Processes

Manufacturing Processes → Machining & Machine Tools → Non-Traditional Machining

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Question

An electrochemical machining (ECM) is to be used to cut a through hole into a 12 mm12\text{ mm} thick aluminum plate. The hole has a rectangular cross-section, 10 mm×30 mm10\text{ mm} \times 30\text{ mm}. The ECM operation will be accomplished in 2 minutes2\text{ minutes}, with efficiency of 90%90\%. Assuming specific removal rate for aluminum as 3.44×10−2 mm3/(A s)3.44 \times 10^{-2}\text{ mm}^3/(A\text{ s}), the current (in A) required is __________ (correct to two decimal places).
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