02. A.C. Circuit (L-C-R, LC Circuit)
Alternating Current

155226 In a series $L C R$ circuit the frequency of a $10 \mathrm{~V}$ AC voltage source is adjusted in such a fashion that the reactance of the inductor measure $15 \Omega$ and that of capacitor $11 \Omega$. If $R=3 \Omega$, the potential difference across the series combination of $L$ and $C$ will be :

1 $8 \mathrm{~V}$
2 $10 \mathrm{~V}$
3 $22 \mathrm{~V}$
4 $52 \mathrm{~V}$
Alternating Current

155227 An LCR circuit of $R=100 \Omega$ is connected to an AC source $100 \mathrm{~V}, 50 \mathrm{~Hz}$. The magnitude of phase difference between current and voltage is $3^{\circ}$. The power dissipated in the LCR circuit is :

1 $50 \mathrm{~W}$
2 $86.6 \mathrm{~W}$
3 $100 \mathrm{~W}$
4 $200 \mathrm{~W}$
Alternating Current

155228 In $L-R$ circuit, resistance is $8 \Omega$ and inductive reactance is $6 \Omega$, then impedance is :

1 $2 \Omega$
2 $14 \Omega$
3 $4 \Omega$
4 $10 \Omega$
Alternating Current

155229 The LC parallel resonant circuit

1 has a very high impedance
2 has a very high current
3 acts as resistance of very low value
4 has zero impedance
Alternating Current

155230 If the inductance and capacitance are both doubled in L-C-R circuit, the resonant frequency of the circuit will

1 decrease to one-half the original value
2 decrease to one-fourth the original value
3 increase to twice the original value
4 decrease to twice the original value
Alternating Current

155226 In a series $L C R$ circuit the frequency of a $10 \mathrm{~V}$ AC voltage source is adjusted in such a fashion that the reactance of the inductor measure $15 \Omega$ and that of capacitor $11 \Omega$. If $R=3 \Omega$, the potential difference across the series combination of $L$ and $C$ will be :

1 $8 \mathrm{~V}$
2 $10 \mathrm{~V}$
3 $22 \mathrm{~V}$
4 $52 \mathrm{~V}$
Alternating Current

155227 An LCR circuit of $R=100 \Omega$ is connected to an AC source $100 \mathrm{~V}, 50 \mathrm{~Hz}$. The magnitude of phase difference between current and voltage is $3^{\circ}$. The power dissipated in the LCR circuit is :

1 $50 \mathrm{~W}$
2 $86.6 \mathrm{~W}$
3 $100 \mathrm{~W}$
4 $200 \mathrm{~W}$
Alternating Current

155228 In $L-R$ circuit, resistance is $8 \Omega$ and inductive reactance is $6 \Omega$, then impedance is :

1 $2 \Omega$
2 $14 \Omega$
3 $4 \Omega$
4 $10 \Omega$
Alternating Current

155229 The LC parallel resonant circuit

1 has a very high impedance
2 has a very high current
3 acts as resistance of very low value
4 has zero impedance
Alternating Current

155230 If the inductance and capacitance are both doubled in L-C-R circuit, the resonant frequency of the circuit will

1 decrease to one-half the original value
2 decrease to one-fourth the original value
3 increase to twice the original value
4 decrease to twice the original value
Alternating Current

155226 In a series $L C R$ circuit the frequency of a $10 \mathrm{~V}$ AC voltage source is adjusted in such a fashion that the reactance of the inductor measure $15 \Omega$ and that of capacitor $11 \Omega$. If $R=3 \Omega$, the potential difference across the series combination of $L$ and $C$ will be :

1 $8 \mathrm{~V}$
2 $10 \mathrm{~V}$
3 $22 \mathrm{~V}$
4 $52 \mathrm{~V}$
Alternating Current

155227 An LCR circuit of $R=100 \Omega$ is connected to an AC source $100 \mathrm{~V}, 50 \mathrm{~Hz}$. The magnitude of phase difference between current and voltage is $3^{\circ}$. The power dissipated in the LCR circuit is :

1 $50 \mathrm{~W}$
2 $86.6 \mathrm{~W}$
3 $100 \mathrm{~W}$
4 $200 \mathrm{~W}$
Alternating Current

155228 In $L-R$ circuit, resistance is $8 \Omega$ and inductive reactance is $6 \Omega$, then impedance is :

1 $2 \Omega$
2 $14 \Omega$
3 $4 \Omega$
4 $10 \Omega$
Alternating Current

155229 The LC parallel resonant circuit

1 has a very high impedance
2 has a very high current
3 acts as resistance of very low value
4 has zero impedance
Alternating Current

155230 If the inductance and capacitance are both doubled in L-C-R circuit, the resonant frequency of the circuit will

1 decrease to one-half the original value
2 decrease to one-fourth the original value
3 increase to twice the original value
4 decrease to twice the original value
Alternating Current

155226 In a series $L C R$ circuit the frequency of a $10 \mathrm{~V}$ AC voltage source is adjusted in such a fashion that the reactance of the inductor measure $15 \Omega$ and that of capacitor $11 \Omega$. If $R=3 \Omega$, the potential difference across the series combination of $L$ and $C$ will be :

1 $8 \mathrm{~V}$
2 $10 \mathrm{~V}$
3 $22 \mathrm{~V}$
4 $52 \mathrm{~V}$
Alternating Current

155227 An LCR circuit of $R=100 \Omega$ is connected to an AC source $100 \mathrm{~V}, 50 \mathrm{~Hz}$. The magnitude of phase difference between current and voltage is $3^{\circ}$. The power dissipated in the LCR circuit is :

1 $50 \mathrm{~W}$
2 $86.6 \mathrm{~W}$
3 $100 \mathrm{~W}$
4 $200 \mathrm{~W}$
Alternating Current

155228 In $L-R$ circuit, resistance is $8 \Omega$ and inductive reactance is $6 \Omega$, then impedance is :

1 $2 \Omega$
2 $14 \Omega$
3 $4 \Omega$
4 $10 \Omega$
Alternating Current

155229 The LC parallel resonant circuit

1 has a very high impedance
2 has a very high current
3 acts as resistance of very low value
4 has zero impedance
Alternating Current

155230 If the inductance and capacitance are both doubled in L-C-R circuit, the resonant frequency of the circuit will

1 decrease to one-half the original value
2 decrease to one-fourth the original value
3 increase to twice the original value
4 decrease to twice the original value
Alternating Current

155226 In a series $L C R$ circuit the frequency of a $10 \mathrm{~V}$ AC voltage source is adjusted in such a fashion that the reactance of the inductor measure $15 \Omega$ and that of capacitor $11 \Omega$. If $R=3 \Omega$, the potential difference across the series combination of $L$ and $C$ will be :

1 $8 \mathrm{~V}$
2 $10 \mathrm{~V}$
3 $22 \mathrm{~V}$
4 $52 \mathrm{~V}$
Alternating Current

155227 An LCR circuit of $R=100 \Omega$ is connected to an AC source $100 \mathrm{~V}, 50 \mathrm{~Hz}$. The magnitude of phase difference between current and voltage is $3^{\circ}$. The power dissipated in the LCR circuit is :

1 $50 \mathrm{~W}$
2 $86.6 \mathrm{~W}$
3 $100 \mathrm{~W}$
4 $200 \mathrm{~W}$
Alternating Current

155228 In $L-R$ circuit, resistance is $8 \Omega$ and inductive reactance is $6 \Omega$, then impedance is :

1 $2 \Omega$
2 $14 \Omega$
3 $4 \Omega$
4 $10 \Omega$
Alternating Current

155229 The LC parallel resonant circuit

1 has a very high impedance
2 has a very high current
3 acts as resistance of very low value
4 has zero impedance
Alternating Current

155230 If the inductance and capacitance are both doubled in L-C-R circuit, the resonant frequency of the circuit will

1 decrease to one-half the original value
2 decrease to one-fourth the original value
3 increase to twice the original value
4 decrease to twice the original value