Metallic surveying tapes are made of _____________ which has a low co-efficient of expansion & enough strength ?
Correct answer: A. Invar
- A. Invar
- B. Hastelloy
- C. Duralumin
- D. Monel metal
Explanation
Invar is a nickel-iron alloy with an exceptionally low coefficient of thermal expansion and adequate strength, so it retains dimensional accuracy in surveying tapes. Monel and Hastelloy are mainly selected for corrosion resistance.
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