Thermostat is based on the principle of :

equal expansion of two rods of different lengths

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different expansion of two rods of different lengths

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different expansion of two rods of same length

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equal expansion of two rods of same length.

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Solution

The correct option is B different expansion of two rods of same length
Thermostat is a technological appliance by which it senses the ambient temperature and maintain a set point temperature. It is usually made of two metallic strips having slightly different thermal expansion coefficient. This result in a bending of the bimetallic strip that can be used to break an electrical circuit at high enough temperatures.

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Similar questions

Q. Two rods of same length and same diameter are drawn from equal masses and same quantity of heat is supplied to the two rods find the ratio of expansion if specific heats of the materials is (2/3) and that of coefficient of linear expansion is (1/2)

Q. (A): Two rods of the same material have the same lengths but diameters are in the ration of 1:2. If 1000 cal of heat is supplied to the two rods separately the ratio of their linear expansion is 8:1.
(B): The linear expansion

e = l α Δ t

Two rods of different materials, having coefficients of linear expansion $α_{1}$ and $α_{2}$ and Young's moduli $Y_{1}$ and $Y_{2}$ respectively, are fixed between two rigid walls. The rods are heated to the same temperature. There is no bending of the rods. If $α_{1} : α_{2} = 2 : 3$ , the thermal stress developed in the two rods will be equal provided $Y_{1} : Y_{2}$ is equal to

Q. Two rods of different materials having coefficients of thermal expansion and Young's moduli

Y_{1}, Y_{2}

, respectively are fixed between two rigid massive walls. The rods are heated such that undergo the same increase in temperature. There is no bending of the rods. If

α_{1} : α_{2} = 2 : 3

, the thermal stresses developed in the two rods are equal provided

Y_{1} : Y_{2}

is equal to:

Q. Two rods, one of iron and the other of aluminum, are heated to the same temperature difference. If the coefficient of expansion of iron rod is more than that of aluminum, then:

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