11. In a three-phase supply floating neutral is undesirable because it way give rise to
12. Power factor of electric bulb is
13. If two sine waves of the same frequency have a phase difference of JT radians, then
14. The power factor at resonance in R-L-C parallel circuit is
15. The period of a wave is
16. Which of the following coil will have large resonant frequency?
17. The r.m.s. value and mean value is the same in the case of
18. Power factor of the system is kept high
19. For a sine wave with peak value Imax the r.m.s. value is
20. For a frequency of 200 Hz, the time period will be
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