A composite beam is composed of two equal strips one of brass and other of steel. If the temperature is raised A. Steel experiences tensile force B. Brass experiences compressive force C. Composite beam gets subjected to a couple D. All the above

The correct answer is D. All the above.

When the temperature is raised, the brass strip expands more than the steel strip. This causes the brass strip to be in compression and the steel strip to be in tension. The difference in the expansion of the two strips also causes a couple to be applied to the composite beam.

The following is a brief explanation of each option:

• Option A: Steel experiences tensile force. When the temperature is raised, the steel strip expands. This causes the steel strip to be in tension.
• Option B: Brass experiences compressive force. When the temperature is raised, the brass strip expands. This causes the brass strip to be in compression.
• Option C: Composite beam gets subjected to a couple. The difference in the expansion of the two strips also causes a couple to be applied to the composite beam.