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An electric bulb rated 100 W, 100 V has to be operated across 141.4 V, 50 Hz AC supply. The capacitance of the capacitor which has to be connected in series with bulb so that bulb will glow with full intensity is

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Important Questions on Alternating Current

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Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>Assignment Set-2>Q 14
An inductor and a resistor are connected in series across A.C. supply. Which of the following phasor diagram may be correct?
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Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>Assignment Set-2>Q 15
Which of the following statement is incorrect about AC circuit?
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Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>Assignment>Q 1
A direct current of 10 A is superimposed on an alternating current I=40cosωtA flowing through a wire. The effective value of the resulting current will be
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Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>Assignment>Q 2
The sinusoidal potential difference V1 shown in figure applied across a resistor R produces heat at a rate W. What is the rate of heat dissipation when the square wave potential difference V2 as shown in figure is applied across the resistor?
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Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>Assignment>Q 3

The output current versus time curve of a rectifier is shown in the figure. The average value of output current in this case is, 

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Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>Assignment>Q 4
Different alternating voltages are given below. In which case the peak value and rms value are same?
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Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>Assignment>Q 5
The virtual current of 4 A and 50 Hz flows in an ac circuit containing a coil. The power consumed in the coil is 240 W. If the virtual voltage across the coil is 100 V, then its resistance will be
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Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>Assignment>Q 6
Two cables of copper are of equal lengths. One of them has a single wire of area of cross-section A, while other has 10 wires of cross-sectional area A10 each. Give their suitability for transporting A.C. and D.C.