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Which of the following is not correct for pneumatic comparator?

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Which of the following is not correct for pneumatic comparator?

(a) Independent of operator skill

(b) Loss of accuracy due to gauge wear

(c) Speedy operation

(d) Total life cost is less

The question was posed to me during an interview for a job.

My question is from Pneumatic Comparators topic in chapter Comparators of Engineering Metrology

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Correct option is (b) Loss of accuracy due to gauge wear

Explanation: In pneumatic comparator, there is no physical contact with setting gauge or part being measured. Due to this reason, there is no loss of accuracy due to gauge wear. It is an accurate, universal, reliable and speedy device.

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