As the temperature of hot junction incre...

As the temperature of hot junction increases, the thermo e.m.f.

always increase

always decrease

may increase or decrease

always remains constant

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Assertion : When temperature of cold junction of a thermocouple is lowered, the value of neutral temperature of this thermocouple is raised. Reason : When the difference of temperature of two junction is raised, more thermo e.m.f. is produced.

A thermo couple is formed by two metals X and Y metal X comes earlier to Y in Seebeck series. If temperature of hot junction increases beyond the temperature of inversion. Then direction of current in thermocouple will so

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Assertion: When temperature of cold junction of a thermocouple is lowered, the value of neutral temperature of this thermo couple is raised. Reason: When the difference of temperature of two junction is raised. More thermo emf is produced.

As the temperature of hot junction of a thermo-couple is increased (while cold junction is at constant temperature), the thermo e.m.f .

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In a thermocouple the temperature of cold junction is 20^(@)C , while the temperature of inversion is 520^(@) C. At what temperature is the thermo emf maximum?

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