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What is the relation between accuracy attained and range of travel in measurement with dial gauges?

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What is the relation between accuracy attained and range of travel in measurement with dial gauges?

(a) Accuracy attained is directly proportional to the range of travel

(b) Accuracy attained is inversely proportional to the range of travel

(c) Accuracy attained is directly proportional to the square of a range of travel

(d) Accuracy attained is independent to the range of travel

The question was asked during an internship interview.

This interesting question is from Advantages of Dial Indicators in chapter Dial Indicators and Indicating Gauges of Engineering Metrology

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Correct answer is (b) Accuracy attained is inversely proportional to the range of travel

Easy explanation: When a measurement is done by using dial indicators then the accuracy achieved in measurement is inversely proportional to the range of travel in measurement. There is no need of very large range to attain high accuracy.

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