A 10 m long mild steel rail section is fixed at 300 K temperature. If temperature increases by 60 K, find stress in rail section if ends are not yielded. Coefficient of thermal expansion is 12×10-6/K.

A 10 m long mild steel rail section is fixed at 300 K temperature. If

1.	A 10 m long mild steel rail section is fixed at 300 K temperature. If temperature increases by 60 K, find stress in rail section if ends are not yielded. Coefficient of thermal expansion is 12×10-6/K.
A.	72 N/mm2
B.	144 N/mm2
C.	120 N/mm2
D.	240 N/mm2
Answer» C. 120 N/mm2