1. The decision to standardize on 60Hz had to do with minimizing: a. b. C. d. e.
ID: 2085499 • Letter: 1
Question
1. The decision to standardize on 60Hz had to do with minimizing: a. b. C. d. e. Real power losses in the overall system Noise from power amplifiers Size of power conductors Annoying light flicker which caused eye fatigue Utility company profits 2. The rotor of a generator spinning at 1800rpm on a 60Hz system must have how many poles: a. b. 3.14159 d. 8 e. 16 f. 32 During the "high frequency" era in North America (c1880-1890), standard power frequency was approximately: 3. a. 100Hz b. 130Hz C. 400Hz d. 900MHz e. 1330kHz 4. High power frequency was a problem for the development of a. Induction motors b. Synchronous motors c. Power transformers d. Reading glasses e. Integrated circuits 5. Another name for early crude power transformers was: a. Sanitarium b. Inductorium c. Optimus Prime d. CaterpillarExplanation / Answer
1. (a) Real power loss in the system.
Explanation:As on higher frequency skin effect will take place and it will lead to increase the losses.
2. (c)Using N=120f/p
=p=120×60/1800
p=4
3.(a)100Hz
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