Out of the following temperature measuring instruments, the measurement accuracy will be minimum for the ________________?
Correct answer: A. Optical pyrometer
- A. Optical pyrometer
- B. Mercury in glass thermometer
- C. Iron-constantan thermocouple
- D. Alcohol filled thermometer
Explanation
An optical pyrometer estimates temperature from thermal radiation and is generally less accurate than direct-contact thermometers over their usable ranges. Mercury, alcohol, and thermocouple instruments provide more direct temperature measurements in ordinary applications.
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