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What is the machinability index of soft cast iron?

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What is the machinability index of soft cast iron?

(a) 100

(b) 30

(c) 80

(d) 70

The question was asked during a job interview.

Question is from Miscellaneous Properties topic in chapter Properties of Engineering Materials of Engineering Material & Metallurgy

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Best answer
Correct choice is (c) 80

The best explanation: Soft cast iron is a common construction material, which possesses a machinability index of 80. The machinability indexes of standard steel, ball bearing steel and cast copper are 100, 30, and 70 in that order.

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