First slide

Thermal expansion

Question

Thermostat works on the principle of

Easy

A

on heating metal expands
B

unequal expansions of different metals on heating
C

Both 1 and 2
D

None

Solution

Thermostat works on the principle of operation of a limit switch. Here a bimetallic strip, made of dissimilar metals having different when heated bends and touches the lever of a limit switch making it on or off. The metals used for making the bimetallic strip must have different coefficient of thermal expansion

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