Machine Design
A metal pipe of 1 m diameter contains a fluid having a pressure of 1 N/mm². If the permissible tensile stress in the metal is 20 N/mm², then the thickness of the metal required for making the pipe will be

10 mm
15 mm
5 mm
25 mm

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Machine Design
A woodruff key is

A tapered key with head at one end
Capable of tilting in a recess milled out in the shaft
Fitted in pairs at right angles
All of these

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