What is the advantage of using a higher-frequency?
What will be an ideal response?
In the United States and Canada, 60 Hz is used almost exclusively, with the exception of a few areas that use 25-Hz service. The advantage to using a higher-frequency service is that less iron and copper are required in the transformers. Therefore, they are lighter and lower in cost. Also, incandescent lamps operating at 60 Hz have no noticeable flicker. At 25 Hz, the flicker of incandescent lamps can be annoying.
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Comment on the feasibility of cooling your kitchen in the summer by opening the door to the electrically powered refrigerator.
What will be an ideal response?
A permanent flood-control dam is expected to have an initial cost of $2.8 million and an annual M&O cost of $20,000. In addition, minor reconstruction will be required every 5 years at a cost of $200,000. As a result of the dam, flood damage will be reduced by an average of $310,000 per year. Using an interest rate of 6% per year, the conventional B/C ratio will be closest to: (choose one)
(a) 0.46 (b) 1.02 (c) 1.40 (d) 1.96
What component is used on many current systems to continually hold the injectors under a moderate fuel charge?
A. Fuel pump. B. Injector low pressure connectors. C. Fuel rail. D. Pressure regulator.
Most of the energy we use comes from something we already have on Earth. The only "new" energy we get comes from the ____________________.
Fill in the blank(s) with the appropriate word(s).