UNIT I

5. Subcycle disturbance in the AC waveform evidenced by a sharp, brief discontinuity of the waveform.
8. The acceptable value of THD should be below.......percent.
10. Notching is a periodic voltage………
11. Incorrect tap setting on transformer is caused by……..
13. What problems occur when the alternating voltage power sources 60HZ sine wave is distorted?
15. Number of complete cycles of a periodic wave in a unit time.

1. Electrical transient characterized by a sharp increase in voltage or current.
2. Sustained interruptions last longer than……….seconds.
3. Qualitative term indicating the deviation of a periodic wave from its ideal characteristics.
4. Power quality indices means assessing the…………….
6. An increase to between 1.1 and 1.8 per in rms voltage at the power frequency is defined as the………
7. Interruptions are a complete loss of……….
9. Over load circuits can result in.
12. The duration of voltage sag is less than………min.
14. Sources of sag interruptions.