question_answer

Consider the following statements:

Thermal stress is induced in a component in general, when

1. A temperature gradient exists in the component.

2. The component is free from any restraint.

3. It is restrained to expand or contract freely.

Which of the above statements is/are correct?

A) 1 and 2            

B) 2 and 3

C) 3 alone             

D) 2 alone.