List of top Physics Questions on LCR Circuit asked in KEAM

For a given ac supply voltage $60\sin\omega t$, the reactances offered by $L$ and $C$ are found to be $20,\Omega$ each. If the resistance of the resistor is also $20,\Omega$, then the current in the circuit is

An AC circuit with \(R=2\pi^2\,\Omega\) and \(L=0.02\pi\) H powered with an a.c. source of frequency 50 Hz has an impedance of

The r.m.s current of an alternating current given by $i = 4\sqrt{2}\sin \omega t + 3\sqrt{2}\cos \omega t$ is:
In an AC circuit, R = 2$\pi^2\Omega$, L = 0.02$\pi$H and is powered by an AC voltage of frequency 50 Hz. Find impedance of the circuit ?
In ac circuit containing an ac source of frequency f, the capacitance is proportional to
The rms value of a.c with peak value of \(200\) V is
An alternating current having the peak value \( 10\sqrt{2}\,\text{A} \) is used to heat a metal wire. To produce the same heating effect, the constant current required is
The a.c circuit exhibiting the phenomenon of resonance has/have the circuit element(s)
In an LCR series resonance circuit driven by the alternating voltage \( V = V_0 \sin \omega t \), inductance \( L = 1 \, \mu H \), capacitance \( C = 1 \, \mu F \) and resistance \( R = 1 \, k\Omega \). The resonant angular frequency (in rad/s) is:
Among vadous circuits coDstructed with rcsistor _R, inductor _L and capacitor C, the cicuit that gives maximum power dissipation is
Choose the wrong statement for the pure inductive circuit.
A pure inductor of inductance 0.1 H is connected to an AC source (of rms voltage) 220 V and angular frequency of 300 Hz. The rms current is
In an LCR series circuit (of inductance L, capacitance C and resistance R), the impedance is minimum when the angular frequency of the source is given by
An alternating voltage $V=V_0\sin\omega t$ is applied across a circuit and as a result, a current $I=I_0\sin\left(\omega t+\frac{\pi}{2}\right)$ flows in it. The power consumed per cycle is
A voltage $V_{PQ}=V_0\cos\omega t$ is applied between the points P and Q in the network shown. $C=\frac{1}{\omega R\sqrt{3}}$ and $L=\frac{R\sqrt{3}}{\omega}$. The total impedance between P and Q is
An oscillator circuit contains an inductor 0.05 H and a capacitor of capacity 80 $\mu$F. When the maximum voltage across the capacitor is 200 V, the maximum current (in amperes) in the circuit is
The self inductance of a long solenoid carrying current is independent of
The r.m.s. value of A.C. which when passed through a resistor produces heat, which is twice that produced by a steady current of $1.414$ A in the same resistor is
In a series LCR AC circuit, the current is maximum when the impedance is equal to
A lamp consumes only 25% of the peak power in an AC circuit. The phase difference between the applied voltage and the current is
In an LCR series circuit, at resonance
In an LCR series circuit, at resonance
In an LCR series circuit, at resonance
The impedance of a $ RC $ circuit is $ {{Z}_{1}} $ for frequency $ f $ and $ {{Z}_{2}} $ for frequency $ 2f $ . Then, $ {{Z}_{1}}/{{Z}_{2}} $ is
The power factor of $LCR$ circuit at resonance is