Current Electricity and Electrical InstrumentHard
Question
The temperature of the cold junction of a thermocouple is 0oC and the temperature of the hot junction is ToC. The relation for the thermo emf is given by; E = AT - 
BT2
(when A = 16 and B = 0.08). The temprature of inversion will be:
BT2 (when A = 16 and B = 0.08). The temprature of inversion will be:
Options
A.500oC
B.460oC
C.600oC
D.400oC
Solution
Since, E = AT - BT2
E = 16T - 0.08T2 = 16T - 0.04T2
At temperature of inversion, E = 0
So, 16T - 0.04T2 = 0 ⇒ T = 0
or16 - 0.04T = 0
T =
400oC
BT2E = 16T -
0.08T2 = 16T - 0.04T2At temperature of inversion, E = 0
So, 16T - 0.04T2 = 0 ⇒ T = 0
or16 - 0.04T = 0
T =
400oCCreate a free account to view solution
View Solution FreeTopic: Current Electricity and Electrical Instrument·Practice all Current Electricity and Electrical Instrument questions
More Current Electricity and Electrical Instrument Questions
Three copper worse have their lengths in the ratio 5: 3: 1 and their masses are in the ratio 1: 3: 5. Their electrical r...Resistance of an ideal voltmeter is :...A galvanometer of resistance G, is shunted by a resistance SΩ. To keep the main current in the circuit unchanged, t...In the following circuit if VA−VB = 4V, then the value of resistance X in ohms will be : -...Three voltmeters, all having different resistances, are joined as shown. When some potential difference is applied acros...