Alternating Current PYQs - Last 10 Years

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Practice 42 COMEDK Physics questions from Alternating Current. Use the year-wise and type-wise breakdown to prioritize recent PYQs, then continue into the question list below.

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Last 10 Years Alternating Current Questions

Showing 42 of 42 filtered questions.

1Alternating Current

If wattless current flows in an AC circuit, then the circuit is:
A. LR circuit
B. Purely capacitive circuit
C. Purely resistive circuit
D. LCR circuit

2Alternating Current

A solenoid having resistance $R=60 \Omega$ and inductance $L=0.4 \mathrm{H}$ is connected to an AC source $V=100 \sqrt{2} \sin 200 t$.
Find the maximum current.

3Alternating Current

An AC generator having 400 turns and an area of cross section of $2 \times 10^{-3} \mathrm{~m}^2$ rotates with an angular speed of $200 \pi \mathrm{rad} \mathrm{s}^{-1}$ in a uniform magnetic field of strength 0.4 T . The generator is conne...

4Alternating Current

In a given circuit, the instantaneous values of the alternating voltage and current are $V=0.5 \sin \left(80 \pi t+\frac{\pi}{3}\right)$ volt and $I=0.5 \sin (80 \pi t)$ ampere respectively. Find the average power consumed in that circuit.

5Alternating Current

A source of alternating emf $\varepsilon=\varepsilon_0 \sin (\omega t)$ is connected to a capacitor. Then the instantaneous current in the circuit is: ˋ

6Alternating Current

An electronic device operates at 2 MHz . The oscillating circuit has an inductance $20 \times 10^{-5} \mathrm{H}$. What is the capacitive reactance of the resonant circuit?

7Alternating Current

If $R$ and $L$ denote resistance and inductance of a material, then the dimension of $L R$ will be:

8Alternating Current

A bulb of resistance 280 Ohm is supplied with a voltage $\mathrm{V}=400 \sin \pi \mathrm{t}$. The peak current is

9Alternating Current

An ideal inductor is connected across a capacitor. Oscillations of energy $K$ are set up in the circuit. The capacitor plates are slowly drawn apart such that the frequency of oscillations is quadrupled. The work done in the process is

10Alternating Current

An LCR series ac circuit is at resonance with 10 V each across $\mathrm{L}, \mathrm{C}$ and R . If the resistance is halved, the respective voltage across $R, C$ and $L$ are

11Alternating Current

The instantaneous values of alternating current and voltages in a circuit are $\mathrm{I}=\frac{3}{\sqrt{2}} \sin (200 \pi t)$ ampere and $\mathrm{V}=\frac{3}{\sqrt{2}} \sin \left(200 \pi t+\frac{\pi}{6}\right)$ volt. What is the average po...

12Alternating Current

A series LCR circuit having $\mathrm{R}=44 \Omega, \mathrm{~L}=2 \mathrm{H}$ and $\mathrm{C}=25 \mu \mathrm{~F}$ is connected to a variable frequency of 220 V . What is the average power transferred to the circuit in one complete cycle if t...

13Alternating Current

In a pure inductive circuit, a sinusoidal voltage $V(t)=200 \sin 250 t$ is applied to a pure inductance of $\mathrm{L}=0.02 \mathrm{H}$. The current through the coil is:

14Alternating Current

A power transmission line feeds input power at 2200 V to a step-down transformer with its primary windings having 2000 turns. The output power is delivered at 220 V by the transformer. If the current in the primary of the transformer is 2 A...

15Alternating Current

The ratio of the number of turns of the primary coil to the secondary coil of an ideal transformer is $5: 1$. The primary is connected to 220 V supply. What is the output power of the transformer if the output resistance is $11 \Omega$ ?

16Alternating Current

In which of the following circuit do we find the current and voltage in phase?

17Alternating Current

What should be the value of the inductance of the coil which is to be connected to 220 V , 50 Hz supply so that maximum current of $3 \sqrt{2} A$ flows through the circuit ?

18Alternating Current

A coil of inductance \(1 \mathrm{H}\) and resistance \(100 \Omega\) is connected to an alternating current source of frequency \(\frac{50}{\pi} \mathrm{~Hz}\). What will be the phase difference between the current and voltage?

19Alternating Current

The capacitance of a parallel plate capacitor is \(400 \mathrm{~pF}\). It is connected to an ac source of \(100 \mathrm{~V}\) having an angular frequency \(100 \mathrm{~rad~s}^{-1}\). If the rms value of the current is \(4 \mu \mathrm{A}\),...

20Alternating Current

A transformer which steps down \(330 \mathrm{~V}\) to \(33 \mathrm{~V}\) is to operate a device having impedance \(110 \Omega\). The current drawn by the primary coil of the transformer is :

21Alternating Current

A coil offers a resistance of \(20 \mathrm{~ohm}\) for a direct current. If we send an alternating current through the same coil, the resistance offered by the coil to the alternating current will be :

22Alternating Current

In the \(\mathrm{A} . \mathrm{C}\). circuit given below, voltmeters \(\mathrm{V}_1\) and \(\mathrm{V}_2\) read \(100 \mathrm{~V}\) each. Find the reading of the voltmeter \(\mathrm{V}_3\) and the ammeter \(\mathrm{A}\).

23Alternating Current

When an A.C. source is connected to a inductive circuit,

24Alternating Current

An AC voltage source of variable angular frequency \(\omega\) and fixed amplitude \(\mathrm{V}_0\) is connected in series with a capacitance \(\mathrm{C}\) and an electric bulb of resistance \(\mathrm{R}\) (inductance zero). When \(\omega\)...

25Alternating Current

A transformer has 400 turns in its primary winding and 800 turns in its secondary winding. The primary voltage is \(20 \mathrm{~V}\) and the load in the secondary is 4 ohm. The current in the primary, assuming it to be an ideal transformer,...

26Alternating Current

A group of devices having a total power rating of 500 watt is supplied by an \(\mathrm{AC}\) voltage \(E=200 \sin \left(3.14 t+\frac{\pi}{4}\right)\). Then the r.m.s. value of the circuit current is

27Alternating Current

What should be the inductance of an inductor connected to \(200 \mathrm{~V}, 50 \mathrm{~Hz}\) source so that the maximum current of \(\sqrt{2}\) A flows through it?

28Alternating Current

\(220 \mathrm{~V}\) ac is more dangerous than \(220 \mathrm{~V}\) dc Why?

29Alternating Current

In an electrical circuit \(R, L, C\) and \(\mathrm{AC}\) voltage source are all connected in series. When \(L\) is removed from the circuit, the phase difference between the voltage and the current in the circuit is \(\pi / 3\). If instead ...

30Alternating Current

In the case of an inductor

31Alternating Current

In the series L-C-R circuit shown, the impedance is

32Alternating Current

The instantaneous values of alternating current and voltages in a circuit given as
$$\begin{aligned} & i=\frac{1}{\sqrt{2}} \sin (100 \pi t) \mathrm{amp} \\ & e=\frac{1}{\sqrt{2}} \sin (100 \pi t+\pi / 3) \text { volt } \end{aligned}$$
The ...

33Alternating Current

The AC voltage across a resistance can be measured using a

34Alternating Current

An alternating voltage = 200 \(\sin 100t\) is applied to a series combination of \(R=30\Omega\) and an inductor of 400 mH. The power factor of the circuit is,

35Alternating Current

A series L-C-R circuit is connected to an AC source of 220 V and 50 Hz shown in figure. If the readings of the three voltmeters \(V_1,V_2\) and \(V_3\) are 65 V, 415 V and 204 V respectively, the value of inductance and capacitance will be

36Alternating Current

A DC ammeter and a hot wire ammeter are connected to a circuit in series. When a direct current is passed through circuit, the DC ammeter shows 6 A. When AC current flows through circuit, what is the average readings in DC ammeter and the A...

37Alternating Current

During the phenomenon of resonance

38Alternating Current

If impedance is \(\sqrt3\) times of resistance, then find phase difference.

39Alternating Current

What should be the value of self-inductance of an inductor that should be connected to 220 V 50 Hz supply, so that a maximum current of 0.9 A flows through it?

40Alternating Current

For the same resonant frequency, if L is changed from L to \({L \over 3}\), then capacitance should change from C to

41Alternating Current

The formula of capacitative reactance is

42Alternating Current

For a series L-C-R circuit at resonance, which statement is not true?