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Which of the following is not a Rockwell hardness scale?

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+1 vote
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in Engineering Material & Metallurgy by (773k points)
Which of the following is not a Rockwell hardness scale?

(a) A

(b) E

(c) N

(d) K

I have been asked this question by my college professor while I was bunking the class.

My doubt stems from Hardness Tests on Metals in portion Wear of Metals, Mechanical Properties and Testing of Engineering Material & Metallurgy

1 Answer

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Best answer
Right choice is (c) N

Best explanation: There are several scales on which Rockwell hardness tests may be conducted. The A-scale uses a diamond cone indenter, whereas E-scale and K-scale use a 1/8 inch diameter steel ball of 100 kg and 150 kg indenting loads respectively.

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