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If an air electric multicheck comparator is used to check dimensions of shafts then which of the following option is correct?

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If an air electric multicheck comparator is used to check dimensions of shafts then which of the following option is correct?

(a) Air comparators are used for checking concentricity only

(b) Air comparators are used for checking concentricity and diameter

(c) Electric multicheck is used to check diameter only

(d) Electric multicheck is more convenient to check concentricity and diameter

The question was asked during an online interview.

I want to ask this question from Multicheck Comparators topic in portion Comparators of Engineering Metrology

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The correct answer is (b) Air comparators are used for checking concentricity and diameter

For explanation: Both the air multicheck comparator and electric multicheck comparator are used in this type of comparator. It is convenient and easy to use air comparator to check diameter and concentricity and for other measurements, electric-checks are used.

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