21. The harmonics in rotating machines are generated due to
22. The effect of harmonics in rotating machines can be minimized by
23. In dc machines the number of poles is generally decided by
24. In dc machines by increasing the number of poles, all of the following reduce except:
USA - United States of America Canada United Kingdom Australia New Zealand South America Brazil Portugal England Scotland Norway Ireland Denmark France Spain Poland Netherland Germany Sweden South Africa Ghana Tanzania Nigeria Kenya Ethiopia Zambia Singapore Malaysia India Pakistan Nepal Taiwan Philippines Libya Cambodia Hong Kong China UAE - Saudi Arabia Qatar Oman Kuwait Bahrain Dubai Israil and many more....