Civil Engineering - UPSC Civil Service Exam Questions - Discussion

49. 

A 600 mm long and 50 mm diameter rod of steel (E = 200 GPa, α = 12 x 10-6/°C) is attached at the ends to unyielding supports. When the temperature is 30°C there is no stress in the rod. After the temperature of the rod drops to - 20°C, the axial stress in the rod will be

[A]. 24 MPa (compressive)
[B]. 72 MPa (compressive)
[C]. 120 MPa (tensile)
[D]. 144 MPa (compressive)

Answer: Option C

Explanation:

No answer description available for this question.

Sai Krishna said: (May 29, 2020)  
Change in length = 600*12*10^-6*50 = 0.36mm,
Strain = 0.36/600 = 0.0006,
Stress = 0.0006*200*10^3 = 120MPa.

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