First slide

Thermal expansion

Question

At some temperature T, a bronze pin is a little large to fit into a hole drilled in a steel block. The change in temperature required for an exact fit is minimum when

Moderate

A

Only the block is heated
B

Both block and pin are heated together
C

Both block and pin are cooled together
D

Only the pin is cooled

Solution

Since coefficient of expansion of steel is greater than that of bronze. Hence with small increase in its temperature the hole expand sufficiently and the change in temperature required is minimum

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