A steel bar 600mm long and having 30mm diameter, is turned down to 25m – McqOptions

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1.	A steel bar 600mm long and having 30mm diameter, is turned down to 25mm diameter for one fourth of its length. It is heated at 30 C above room temperature, clamped at both ends and then allowed to cool to room temperature. If the distance between the clamps is unchanged, the maximum stress in the bar ( α = 12.5 x 10-6 per C and E = 200 GN/m2) is
A.	25 MN/m2
B.	40 MN/m2
C.	50 MN/m2
D.	75 MN/m2
Answer» E.

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