470. Tail stock centres which do not revolve with the workpiece are known as
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471. Parkerizing process is
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472. In electro-discharge machining, the tool is made of
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473. Which is false statement about electrodischarge machining
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474. In electro-chemical milling operation, the gap between tool and work is kept of the order of
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475. In spark erosion machining process, the gap between tool and workpiece is filled with
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476. In the electro-discharge machining process, the workpiece and the electrode are submerged in
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