A motor with a 200-horsepower output is neededin the
Chapter , Problem 9-72(choose chapter or problem)
A motor with a 200-horsepower output is neededin the factory for intermittent use. A Graybar motorcosts $7000 and has an electrical efficiency of 89%.A Blueball motor costs $6000 and has an 85%efficiency. Neither motor would have any salvagevalue, since the cost to remove it would equalits scrap value. The annual maintenance cost foreither motor is estimated at $300 per year. Elec-tric power costs $0.072/kWh (1 hp=0.746kW). Ifa 10% interest rate is used in the calculations, whatis the minimum number of hours the higher initialcostGraybarmotor mustbe usedeachyearto justifyits purchase?
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