A) lead-nickel
B) copper-iron
C) gold-silver
D) antimony-bismuth
Correct Answer: D
Solution :
Thermocouples are widely used type of temperature sensor and are used as means to convert thermal potential difference into electric potential difference, using different combinations of metals. If metals were arranged according to their heating contrasts a series was formed antimony, iron, zinc, silver, gold, lead, mercury, copper, platinum and bismuth. The greater the heating contrasts between metals, the greater the electromotive force (EMF). Antimony and bismuth formed the best junction for emf.
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