In hot wire anemometer used for gas flow measurement, the wire is normally made of ______________________?
Correct answer: B. Platinum
- A. Copper
- B. Platinum
- C. Constantan
- D. Chromium
Explanation
A hot-wire anemometer uses a fine electrically heated wire whose cooling indicates gas velocity; platinum is preferred because it is stable, durable, and has a reproducible temperature-resistance relationship. Copper is more easily oxidised and is less suitable for the heated sensing element.
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