Discussion
Match the following lists of various thermocouples & sensitivity:
| List - I | List - II |
|---|---|
| a. Copper constantan | i. 3-20 µv/°C |
| b. Chromel/ Alumel | ii. 5-12 µv/°C |
| c. Tungsten / Tungsten 26% Rhenium | iii. 15-60 µv/°C |
| d. Platinum / Platinum 10% Rhodium | iv. 40-55 µv/°C |
The correct match is : a b c d
Answer: B
The match is a-iii, b-iv, c-i, d-ii. Copper constantan has a sensitivity of 15 to 60 microvolts per degree Celsius, chromel alumel 40 to 55, tungsten against tungsten 26 percent rhenium 3 to 20, and platinum against platinum 10 percent rhodium 5 to 12, since the noble-metal couple is the least sensitive.
The other options give platinum couples the highest sensitivity or copper constantan the lowest, which the ranges do not allow.
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