UPSC Civil Service Exam Questions - Engineering

Q1:

Consider the following statements regarding tensile test diagrams for carbon steel with varying carbon contents :
As the carbon content increases
1. the ultimate strength of steel decreases
2. the elongation before fracture increases
3. the ductility of the metal decreases
4. the ultimate strength increases.
Of these statements :

A 3 and 4 are correct

B 1 and 3 are correct

C 1, 2 and 3 are correct

D 1 and 2 are correct

ANS:C - 1, 2 and 3 are correct

The right Answer is A. Higher carbon content in steel increases strength and decreases percentage elongation.