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Up to which length of gauges, there is no appreciable change in length with a method of support?

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Up to which length of gauges, there is no appreciable change in length with a method of support?

(a) 75 mm

(b) 100 mm

(c) 150 mm

(d) 200 mm

This question was posed to me in an interview for job.

This intriguing question originated from Conditions of Comparison in chapter Standards of Measurements of Engineering Metrology

1 Answer

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The correct option is (a) 75 mm

Explanation: For small gauges upto 75 mm length, there is no appreciable change in length for a method of supports. But dimensions of long gauges may change even by their own weight.

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