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Question
Imagine that as an engineering intern you have been assigned the task of selecting a motor for a pump. After reviewing motor catalogs you narrow your choice to two motors that are rated at 1.5 kW. Additional information collected is shown in an accompanying table. The pump is expected to run 4200 hours every year. After checking with your electric utility company, you determine the average cost of electricity is about 10 cents per kWh. Based on the information given here, which one of the motors will you recommend to be purchased? Assume i = 8%.| Criteria | Motor X | Motor Y |
| Expected useful life | 5 years | 5 years |
| Initial cost | $400 | $500 |
| Efficiency at the operating point | 0.75 | 0.85 |
| Estimated maintenance cost | $12 per year | $10 per year |
Answer
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