Bourdon tube is never made of________________?
Correct answer: D. Cast iron
- A. Phosphor bronze
- B. Monel metal
- C. Stainless steel
- D. Cast iron
Explanation
Bourdon tubes require elastic, corrosion-resistant metals such as phosphor bronze, Monel, or stainless steel. Cast iron is too brittle and does not provide the required elastic deformation.
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