71. The peak value of a sine wave is 200 V. Its average value is
72. The product of apparent power and cosine of the phase angle between circuit voltage and current is
73. Which of the following waves has the highest value of peak factor ?
74. In a purely inductive circuit
75. Pure inductive circuit takes power from the A.C. line when
76. The reactance offered by a capacitor to alternating current of frequency 50 Hz is 20 ohms. If frequency is increased to 100 Hz, reactance becomes __________ ohms.
77. Time constant of a circuit is the time in seconds taken after the application of voltage to each
78. Magnitude of current at resonance in R-L-C circuit
79. Inductance of a coil Varies
80. Two waves of the same frequency have opposite phase when the phase angle between them is
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