376 questions in AC Fundamental - HI MCQ!

In a sine wave the slope is constant?

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Inductance of a coil varies?

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How much r.m.s. current does a 300 W. 200 V bulb take from the 200 V, 50 Hz power line?

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In the R-L-C containing R = 4.5 Q, L = 0.06 H, C = 0.6?F the power factor will be?

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On a 3-? balanced delta-connected load supplied at 240 V A.C., the wattmeter readings are -1710 and 3210. What is the current?

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If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is?

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The r.m,s. value of a half-wave rectified current is 100 A Its value for full-wave rectification would be …… ampere?

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Physical quantities of resistance, inductance and capacitance are represented by R, L and C respectively. The combinations which have dimensions of frequency are?

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Two waves of the same frequency have opposite phase when the phase angle between them is?

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A sine wave of voltage varies from zero to maximum of 200 V. How much is the voltage at the instant of 30º of the cycle?

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