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What is the condition of the good design?

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What is the condition of the good design?

(a) machine having operating life of 5-10 years

(b) machine having operating life of 10-15 years

(c) machine having operating life of 15-20 years

(d) machine having operating life of 20-30 years

I got this question in an interview for internship.

This key question is from Design of Machines, Limitations in Design topic in section Fundamental Aspects of Electrical Machine Design of Design of Electrical Machines

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Right option is (d) machine having operating life of 20-30 years

The best explanation: The machine having operating life span of 20-30 years is one of the signs of good design. This type of machines have initial cost to be low.

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