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Which scale is used in surveying instrument?

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Which scale is used in surveying instrument?

(a) Comparative scale

(b) Circular Vernier scale

(c) Vernier scale

(d) Scale of chords

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This interesting question is from Types of Scales topic in chapter Scales of Engineering Drawing

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The correct option is (b) Circular Vernier scale

To elaborate: The circular vernier uses the principle of the vernier. The circular vernier is used in surveying instruments to measure the angle to the required accuracy. In the case of mechanical engineering, it is used in measuring instruments like a micrometer.

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