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Which of the following is correct about the hardness of angle plates?

(a) Minimum hardness of 100 HB

(b) Minimum hardness of 180 HB

(c) Maximum hardness of 180 HB

(d) Maximum hardness of 100 HB

I have been asked this question during an interview.

I need to ask this question from Angle Plates in division Linear Measurements of Engineering Metrology

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Right answer is (b) Minimum hardness of 180 HB

For explanation I would say: Angle plates are generally made of cast iron and have 180 HB minimum hardness. Angle plates are available in various designs.

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