Download Aptitude Crack
img not found img not found

UPSC Civil Service Exam Questions - Engineering

Q1:

A steel rod, 100 mm long is held between two rigid supports. It is heated by 20°C. If the coefficient of thermal expansion of the material of the rod is 15 x 10-6 /° C and modulus of elasticity is 200 x 103 MN/m2, what is the stress in the rod ?

A 20 MN/m2

B 40 MN/m2

C 60 MN/m2

D 80 MN/m2

ANS:C - 60 MN/m2

= Alpha*T*E.
= 15*10^-6 *20*200*10^3.