Current Electricity Charging Discharging Of Capacitors Question 123
Question: A thermo couple uses Bismuth and Tellurium as the dissimilar metals. The sensitivity of bismuth is $ -,72\mu ,V{{/}^{o}}C $ and that of the tellurium is $ 500\mu V{{/}^{o}}C $ . If the difference between hot and cold junction is $ 100^{o}C, $ then the maximum output will be
Options:
A) $ 50mV $
B) $ 7.2mV $
C) $ 42.8mV $
D) $ 57.2mV $
Show Answer
Answer:
Correct Answer: D
Solution:
The sensitivity of the thermocouple will be $ =500\mu V{{/}^{o}}C-(-72\mu V{{/}^{o}}C) $
$ =572\mu ,V{{/}^{o}}C $
Therefore for a $ 100^{o}C $ temperature difference, the thermo e.m.f. will be $ E=572\times {{10}^{-6}}\times 100,(volt) $
$ =57.2\times {{10}^{-3}} $
$ =57.2mV. $
BETA
