Recent questions in Alternating Current

If $L= 10\;mH,C=100\;\mu F,R=100 \;\Omega $ in a LCR circuit the value of resonance frequency is

asked Mar 27, 2014 by meena.p

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Power factor of resonance LCR circuit is

asked Mar 27, 2014 by meena.p

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In an ac circuit $E=E_0\;\sin wt$ and $I=I_0 \sin (wt -\large\frac{\pi}{2})$ the power consumption in circuit is

asked Mar 27, 2014 by meena.p

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Resonance frequency of a circuit is f. If capacitance is made 4 time the initial value, the resonance frequency will be

asked Mar 27, 2014 by meena.p

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Voltage and current in the a.c circuit are given by $V= 5 \sin (100 \pi t -\large\frac{\pi}{6})$ and $I= 4 \sin (100 \pi t + \pi/6)$

asked Mar 27, 2014 by meena.p

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In an LCR series circuit, connected to a source E is at resonance then

asked Mar 27, 2014 by meena.p

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An LCR circuit given below is connected to a variable frequency w and constant peak voltage $V_0$ . at certain $w_0=w_1$ the rms voltage value across L, C and R are respectively $100\;V,60\;V$ and $30\;V$ . At different value of $w_0=w_2$ we find the voltage across resistance is $50\;V$ Then $w_2$ is

asked Mar 26, 2014 by meena.p

1 answer

The $220\;v$ input is supplied to a transformer . The output circuit draws current of $2.0\;A$ at $440\;V$ If efficiency of transforms is $80\%$ te current drawn by primary circuit is

asked Mar 26, 2014 by meena.p

1 answer

The Voltage time (V-t) graph of triangular wave having peak value $V_0$ is shown. The rms value of V in interval $t=0$ to $t=\large\frac{\pi}{4}$ is

asked Mar 26, 2014 by meena.p

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Power loss in AC circuit will be minimum when

asked Mar 26, 2014 by meena.p

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Effective value of current is $5.0\;amp$ in a 50 cycle ac circuit. What is value of current $\large\frac{1}{300}\;$seconds after it is zero ?

asked Mar 25, 2014 by meena.p

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An LCR circuit has $L= 3.0 H, C= 27 \;\mu F$ and $ R= 7.4 \;\Omega$ with a certain a factor. To improve the sharpness of resonance by reducing its full width at half maximum by a factor of 2, with out changing $w_0$, we can

asked Mar 25, 2014 by meena.p

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In an ac circuit with combination of L and C which one of following represents the variation of frequency f with reactance X?

asked Mar 25, 2014 by meena.p

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The equation of AC voltage is $E=220\; \sin (wt+\large\frac{\pi}{6})$ and AC current is $I= 10 \sin (wt+\large\frac{\pi}{6})$ The average power dissipated is

asked Mar 25, 2014 by meena.p

1 answer

A bulb is rated $100\;V,100\;W$ The inductance of an inductor that should be connected in series with the bulb to operate the bulb at rated power, with ac source $200 V, 50 \;Hz$

asked Mar 25, 2014 by meena.p

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An AC Source gives a voltage of $V= 20\; \cos \;(2000 \;t)$. It is connected in a circuit as shown. The voltmeter reading is

asked Mar 25, 2014 by meena.p

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In the given circuit what will be reading of voltmeter.

asked Mar 25, 2014 by meena.p

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For the series LCR circuit what is resonance frequency and amplitude.

asked Mar 25, 2014 by meena.p

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A LC circuit has a $10\;V,50\;Hz$ AC sources, A current of $1A$ flows in the circuit. The voltage leads by u phase angle of $\large\frac{\pi}{3}$ radians. The Value of resistance and inductive resistance are

asked Mar 25, 2014 by meena.p

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A bulb connected to 50 V, DC consumes 20 W power. Then the bulb is connected to a capacitor in an a.c. power supply of 250 V, 50 Hz. Find the value of the capacitor required so that the bulb draws the same amount of current.

asked Mar 12, 2014 by balaji.thirumalai

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A coil of inductance 300 mH and resistance $2\Omega$ is connected to a source of voltage 2V. The current reaches half of its steady state value in

asked Feb 15, 2014 by thanvigandhi_1

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