GATE ME 2016 Set 2 — Question 62

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

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

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Question

The surface irregularities of electrodes used in an electrochemical machining (ECM) process are 3 μm3\ \mu\text{m} and 6 μm6\ \mu\text{m} as shown in the figure. If the work-piece is of pure iron and 12V DC12\text{V DC} is applied between the electrodes, the largest feed rate is ___________ mm/min\text{mm/min}.
Conductivity of the electrolyte0.02 ohm1mm10.02\ \text{ohm}^{-1}\text{mm}^{-1}
Over-potential voltage1.5 V1.5\ \text{V}
Density of iron7860 kg/m37860\ \text{kg/m}^3
Atomic weight of iron55.85 gm55.85\ \text{gm}
Assume the iron to be dissolved as Fe+2\text{Fe}^{+2} and the Faraday constant to be 96500 Coulomb96500\ \text{Coulomb}.
Diagram showing tool and work-piece with surface irregularities and nominal gap
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