Which of the following statement is wrong?

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bimetal is used in metal thermometer

bimetal relays are used to open or close electric circuits

bimetals are used to generate electricity

bimetal is used in thermostats for regulating heating or cooling of rooms

answer is B.

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Detailed Solution

Bimetals are made of two different metals having different coefficient of expansion.A bimetallic strip is used to convert a temperature change into mechanical displacement.
Bimetal has the property of bending when heated,so used for open or close circuits.
Thermostats can be constructed in many ways and may use a variety of sensors to measure the temperature, commonly a thermistor or bimetallic strip. The output of the sensor then controls the heating or cooling apparatus.
Thus statement B is wrong.

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