Q.50 | A thermocouple works on the principle that: | |
Ans | 1. on heating the electrode strips bend into curved strips | |
2. the electric resistance of a metal changes due to change in its temperature | ||
3. when a junction of dissimilar metals heated, it produces an electric potential related to temperature | ||
4. there is a decrease in resistance with increasing temperature |
Correct Ans Provided: 3