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Year: 2023
Topic: Alternating current
1.
The net impedence of circuit (as shown in figure) will be
(1).
\(15\, \Omega\)
(2).
\(5 \sqrt{5}\, \Omega\)
(3).
\(25\, \Omega\)
(4).
\(10 \sqrt{2}\, \Omega\)

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Year: 2025
Topic: Alternating current
2.
To an ac power supply of 220 V at 50 Hz, a resistor of 20 \(\Omega\), a capacitor of reactance 25 \(\Omega\) and an inductor of reactance 45 \(\Omega\) are connected in series. The corresponding current in the circuit and the phase angle between the current and the voltage is, respectively
(1).
\(15.6\, \text{A}\) and \(45^\circ\)
(2).
\(7.8\, \text{A}\) and \(30^\circ\)
(3).
\(7.8\, \text{A}\) and \(45^\circ\)
(4).
\(15.6\, \text{A}\) and \(30^\circ\)

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Year: 2021
Topic: Alternating current
3.
An inductor of inductance L, a capacitor of capacitance C and a resistor of resistance ' R ' are connected in series to an ac source of potential difference 'V' volts as shown in figure. Potential difference across L, C and R is 40V , 10 V and 40V ,respectively. The amplitude of current flowing through C R series circuit is \(10\, \sqrt{2}\) A. The impedance of the circuit is
(1).
\(4\, \sqrt{2}\, \Omega\)
(2).
\(5\, \sqrt{2}\, \Omega\)
(3).
\(4\, \Omega\)
(4).
\(5\, \Omega\)

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Year: 2021
Topic: Alternating current
4.
A series L-C-R circuit containing \(5.0\, \text{H}\) inductor, \(80\, \mu \text{F}\) capacitor and \(40\, \Omega\) resistor is connected to 230 V variable frequency AC source.The angular frequencies of the source at which power transferred to the circuit is half the power at the resonant angular frequency are likely to be
(1).
25 rad/s and 75 rad/s
(2).
50 rad/s and 25 rad/s
(3).
46 rad/s and 54 rad/s
(4).
42 rad/s and 58 rad/s

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Year: 2020
Topic: Alternating current
5.
A 40μF capacitor is connected to a 200 V, 50 Hz AC supply. The rms value of the current in the circuit is, nearly
(1).
2.05 A
(2).
2.5 A
(3).
25.1 A
(4).
1.7 A

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