Question

Which of the following statements is true, if a bar of material ‘X’ is placed on a table and is subjected to change in temperature T?

• A. If the elongation is constrained the material experiences compressive stress andstrain.
• B. If the elongation or contraction is constrained, despite the fact that it undergoes a strain, the material does not feel any stress.
• C. If the elongation or contraction is not restricted, despite the fact that it undergoes a strain, the material does not suffer any stress.
• D. If the elongation is not constrained, the material experiences tensile stress and strain.

Answer 1

Answer: (C)

When the temperature of a material changes there will be corresponding change in dimension. • When a member is free to expand or contract or elongation or contraction is not restricted due to rise or fall of the temperature no stress will be induced in the member.