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Which of the following is incorrect about bench centre’s physical characteristics?

(a) Centre holders may be located in any position

(b) Box type straight edges have a rigid cross section for minimum deflection

(c) Minimum hardness of bench centre’s base is 180 HB

(d) Male or female centres are non-adjustable on bench centres

I had been asked this question in an interview for job.

The query is from Bench Centres in chapter Linear Measurements of Engineering Metrology

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Correct answer is (d) Male or female centres are non-adjustable on bench centres

The best explanation: Along the vees of the centre holders, male or female centres can be adjusted and locked in any desired position.

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