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What should be the thickness of a cast iron pipe 45 cm diameter if it is required to sustain 6 kg/sq cm inside pressure ? The maximum stress in the pipe material being limited to 140 kg/cm2

[A].	5 mm	[B].	7.5 mm
[C].	10 mm	[D].	12 mm
[E].	15 mm

Answer: Option C

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