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Which of the ...

Question

Which of the following thermocouple produces the maximum thermo e.m.f. for the same temperature difference between hot and cold junctions?

A

Copper-bismuth

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B

Antimony-bismuth

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C

Iron-nickel

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D

Copper-iron

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Solution

The correct option is B Antimony-bismuth
As the position of antimony and bismuth differ much more than other 3 combinations therefore thermocouple of antimony-bismuth produces the maximum thermo e.m.f.

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