Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
In See back series, antimony appears after bismuth. But in Sb-Bi thermocouple the current flows from: (1) Bi to Sb through hot junction (2) Bi to Sb through cold junction (3) Sb to Bi through hot junction (4) Sb to Bi through cold junctionA) 1 and 2 are correct
B) 2 and 3 are correct
C) 1 and 4 are correct
D) 1, 2 and 3 are correct
Correct Answer: C
Solution :
A series of metals was given by See back in the order that, when a circuit is made up of any two metals in the series, the current flows across the hot junction from the earlier occuring metal in the series to the one coming leter. Since, antimony (Sb) appears after bismuth (Bi) so at hot junction current flows from Bi to Sb and at cold junction, current flows from Sb to Bi.
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