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Recent questions and answers in Alternating Current

Questions >> JEEMAIN and NEET >> Physics >> Class12 >> Alternating Current

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

answered Mar 27, 2014 by meena.p

1 answer

Power factor of resonance LCR circuit is

answered Mar 27, 2014 by meena.p

1 answer

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

answered Mar 27, 2014 by meena.p

1 answer

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

answered Mar 27, 2014 by meena.p

1 answer

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

answered Mar 27, 2014 by meena.p

1 answer

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

answered Mar 27, 2014 by meena.p

1 answer

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

answered 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

answered 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

answered Mar 26, 2014 by meena.p

1 answer

Power loss in AC circuit will be minimum when

answered Mar 26, 2014 by meena.p

1 answer

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 ?

answered Mar 25, 2014 by meena.p

1 answer

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

answered Mar 25, 2014 by meena.p

1 answer

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

answered Mar 25, 2014 by meena.p

1 answer

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

answered 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 $200 V, 50 \;Hz$

answered Mar 25, 2014 by meena.p

1 answer

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

answered Mar 25, 2014 by meena.p

1 answer

In the given circuit what will be reading of voltmeter.

answered Mar 25, 2014 by meena.p

1 answer

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

answered Mar 25, 2014 by meena.p

1 answer

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

answered Mar 25, 2014 by meena.p

1 answer

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.

answered Mar 12, 2014 by balaji.thirumalai

1 answer

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

answered Feb 15, 2014 by thanvigandhi_1

1 answer

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