11. How is normal speed for a DC motor obtained?
What will be an ideal response?
Normal speed for a DC motor is obtained by operating the motor with full rated voltage applied to the field and armature.
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Feng Seawater Desalination Systems has estabÂlished a capital investment limit of $800,000 for next year for projects that target improved recovery of highly brackish groundwater. All projects have a 4?year life and the MARR is 10% per year. (a) Select any or all of the projects. (b) Project Z is a favorite of Mr. Feng. Determine the minimum NCF necessary to make Z the economically best project. (c) Use a spreadsheet to answer the two parts above.
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A single deposit of $25,000 was made by your grandparents on the day you were born 25 years ago. The balance in the account today if it grew at 10% per year is closest to:
(a) $201,667 (b) $241,224 (c) $270,870 (d) $296,454
An attenuator probe employed with oscilloscopes was designed to reduce the magnitude of the input voltage vi by a factor of 10. As shown in Fig. 7.149, the oscilloscope has internal resistance Rs and capacitance Cs, while the probe has an internal resistance Rp. If Rp is fixed at 6 M?, find Rs and Cs for the circuit to have a time constant of 15 ? s.
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Carry the answer to two decimal places. A contractor purchases quantities of wire, fittings, and switches listed at $2,150 at Successive trade discounts of 15%, 10%, and 3%. What is the net cost?
Fill in the blank(s) with the appropriate word(s).