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1. In R-L-C series resonant circuit magnitude of resonance frequency can be changed by changing the value of
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5. If a sinusoidal wave has frequency of 50 Hz with 30 A r.m.s. current which of the following equation represents this wave?
4. The apparent power drawn by an A. C circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is
3. What will be the phase angle between two alternating waves of equal frequency, when one wave attains maximum value the other is at zero value?
2. The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of
1. Power factor of an inductive circuit is usually improved by connecting capacitor to it in
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5. If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is
4. In an AC. circuit, a low value of kVAR compared with kW indicates
3. The r.m.s. value of half wave rectified sine wave is 200 V. The r.m.s. value of full wave rectified A(C) will be
2. The phosphors for which of the following pair are 180° out of phase for VL, VC and VR?
1. The r.m.s value of pure cosine function is
