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A compressed air cylinder carries approximately 70 kg/cm2 pressure at the time of delivery. The inside diameter is 25 cm. If the steel has a yield point of 2300 kg/sq cm and a safety factor of 2.5 the wall thickness should be

[A].	5 mm	[B].	8 mm
[C].	10 mm	[D].	12 mm
[E].	15 mm

Answer: Option C

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