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)-C-120 MPa (tensile)

Question

A 600 mm long and 50 mm diameter rod of steel (E = 200 GPa, &alpha; = 12 x 10-6/&deg;C) is attached at the ends to unyielding supports. When the temperature is 30&deg;C there is no stress in the rod. After the temperature of the rod drops to - 20&deg;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)-C-120 MPa (tensile)

APTITUDE CRACK · Accepted Answer

C 120 MPa (tensile) Thermal stress = ax(T2 T1)xE. 12x10^ 6( 50)x200x10^9. = 120Mpa Attached at the ends to unyielding supports; So, tensile stress.

UPSC Civil Service Exam Questions

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

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UPSC Civil Service Exam Questions

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

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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

For help Students Orientation
Mcqs Questions