Which of the following is universally employed as the low expansion metal in the bimetallic thermometer, which is an iron-nickel alloy containing 36% nickel and has very low co-efficient of expansion (1/20th of ordinary metals) ?
Correct answer: A. Invar
- A. Invar
- B. Constantan
- C. Chromel
- D. Alumel
Explanation
Invar is an iron-nickel alloy containing about 36% nickel and is used where extremely low thermal expansion is required. Constantan is a copper-nickel resistance alloy, while Chromel and Alumel are thermocouple alloys.
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