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Which of the following is not used in making of sine bars?

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Which of the following is not used in making of sine bars?

(a) High carbon

(b) High chromium

(c) Corrosion resistant steel

(d) Aluminium

The question was posed to me by my school principal while I was bunking the class.

The question is from Sine Principle and Sine Bars topic in division Angular Measurement and Circular Division of Engineering Metrology

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Best answer
The correct answer is (d) Aluminium

The explanation is: Sine bars are used to measure angles accurately or locating any work to a specified angle within a close limit. Sine bars are made from high chromium, high carbon, corrosion resistant steel, ground, hardened and stabilised.

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