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It is desired to punch a hole of 20 mm diameter in a plate 20 mm think. If the shear stress of mild steel is 30 kg/mm2, the force necessary for punching would be approximately in the range

[A].	10 - 15 tonnes	[B].	15 - 20 tonnes
[C].	20 - 25 tonnes	[D].	25 - 35 tonnes
[E].	35 - 40 tonnes

Answer: Option E

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