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Alternating Current
Practice Questions
MCQ (Single Correct Answer)
1
An alternating current is given by $i=(3 \sin \omega t+4 \cos \omega t) \mathrm{A}$. The rms current will be
AP EAPCET 2024 - 23th May Morning Shift
2

A 50 Hz AC circuit has a 10 mH inductor and a $2 \Omega$ resistor in series. The value of capacitance to be placed in series in the circuit to make the circuit power factor as unity is

AP EAPCET 2024 - 22th May Morning Shift
3
A resistor of resistance $R$, inductor of inductive reactance $2 R$ and a capacitor of capacitive reactance $X_C$ are connected in series to an AC source.If the series $L-C-R$ circuit is in resonance, then the power factor of the circuit and the value, $X_C$ are respectively
AP EAPCET 2024 - 21th May Evening Shift
4
An inductor and a resistor are connected in series to an AC source of voltage $144 \sin \left(100 \pi t+\frac{\pi}{2}\right) \mathrm{V}$. If the current in the circuit is $6 \sin \left(100 \pi t+\frac{\pi}{6}\right) \mathrm{A}$, then the resistance of the resistor is
AP EAPCET 2024 - 20th May Evening Shift
5
A resistance of $20 \Omega$ is connected to a source of an alternating potential $V=200 \sin (10 \pi t)$. If $t$ is the time taken by the current to change from the peak value to rms value, then $t$ is (in seconds)
AP EAPCET 2024 - 20th May Morning Shift
6
A full wave rectifier circuit is operating from 50 Hz mains. The fundamental frequency in the ripple output will be
AP EAPCET 2024 - 20th May Morning Shift
7
A series $L-C-R$ circuit is shown in the figure. Where the inductance of 10 H , capacitance $40 \mu \mathrm{~F}$ and resistance $60 \Omega$ are connected to a variable frequency 240 V source. The current at resonating frequency is AP EAPCET 2024 - 19th May Evening Shift Physics - Alternating Current Question 8 English
AP EAPCET 2024 - 19th May Evening Shift
8
In the figure. If $A$ and $B$ are identical bulbs, which bulb glows brighter.

AP EAPCET 2024 - 18th May Morning Shift Physics - Alternating Current Question 7 English

AP EAPCET 2024 - 18th May Morning Shift
9

An $$R-L-C$$ circuit consists of a $$150 \Omega$$ resistor, $$20 \mu \mathrm{F}$$ capacitor and a 500 mH inductor connected in series with a 100 V AC supply. The angular frequency of the supply voltage is $$400 \mathrm{rad} \mathrm{s}^{-1}$$. The phase angle between current and the applied voltage is

AP EAPCET 2022 - 5th July Morning Shift
10

Capacitive reactance of a capacitor in an AC circuit is $$3 \mathrm{k} \Omega$$. If this capacitor is connected to a new AC source of double frequency, the capacitive reactance will become.

AP EAPCET 2022 - 4th July Evening Shift
11

A coil of inductance 0.1 H and resistance $$110 \Omega$$ is connected to a source of 110 V and 350 Hz . The phase difference between the voltage maximum and the current maximum is

AP EAPCET 2022 - 4th July Morning Shift
12

A 20 V AC is applied to a circuit consisting of a resistor and a coil with negligible resistance. If the voltage across the resistor is 12 V, the voltage across the coil is

AP EAPCET 2021 - 20th August Morning Shift
13

A bulb of resistance $$280 \Omega$$ is supplied with a 200 V AC supply. What is the peak current?

AP EAPCET 2021 - 19th August Evening Shift
14

A resonant frequency of a current is $$f$$. If the capacitance is made four times the initial value, then the resonant frequency will become

AP EAPCET 2021 - 19th August Morning Shift