10 question-answer on Thermoelectricity 1. 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 (b) Antimony-bismuth (c) Iron-nickel (d) Copper-iron. Ans: (b) 2. When a number of thermocouples are joined in series, the thermo e.m.f. (a) Is decreased (b) Is increased (c) Becomes zero (d) Remains same. Ans: ( b) 3. If one junction of a thermocouple is heated and other junction is cooled continuously in the same steps, the e.m.f. will (a) Increase and then decrease (b) Increase then decrease and finally reverse (c) No change at all (d) Change appreciably. ...
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