iCON Education - Alternating Current AP-EAPCET Test

Question 1: Palette 1/24

AP-EAPCET 2025 MCQ

A coil of inductive reactance $\frac{1}{\sqrt{3}} \Omega$ and a resistance $1 \Omega$ are connected in series to a $200 \mathrm{~V}, 50 \mathrm{~Hz}$ AC source. The time lag between voltage and current is

$\frac{1}{1200} \mathrm{~s}$

$\frac{1}{600} \mathrm{~s}$

$\frac{1}{400} \mathrm{~s}$

$\frac{1}{800} \mathrm{~s}$

Question 2: Palette 2/24

AP-EAPCET 2025 MCQ

An AC source of internal resistance $10^3 \Omega$ is connected to a transformer. The ratio of the number of turns in the primary to the number of turns in the secondary to match the source to a load resistance of $10 \Omega$ is

$1: 10$

$10: 1$

$2: 5$

$5: 2$

Question 3: Palette 3/24

AP-EAPCET 2025 MCQ

In a series LCR circuit, the voltages across the capacitor, resistor and inductor are in the ratio $2: 3: 6,$ if the voltage of the AC source in the circuit is 240 V , then the voltage across the inductor is

240 V

144 V

96 V

288 V

Question 4: Palette 4/24

AP-EAPCET 2025 MCQ

If the voltage and current in an AC circuit are respectively $50 \sin (50 t) \mathrm{V}$ and $50 \sin \left(50 t+\frac{\pi}{4}\right) \mathrm{mA}$, then the power dissipated in the circuit is nearly

1.296 W

0.648 W

0.884 W

1.768 W

Question 5: Palette 5/24

AP-EAPCET 2025 MCQ

In a series resonant LCR circuit, for the power dissipated to become half of the maximum power dissipated, the current amplitude is

$\frac{1}{\sqrt{2}}$ times its maximum value.

$1 / 2$ times its maximum value.

twice its maximum value.

$\sqrt{2}$ times its maximum value.

Question 6: Palette 6/24

AP-EAPCET 2025 MCQ

If a resistor of resistance $4 \Omega$, a capacitor of capacitive reactance $6 \Omega$ and an inductor of inductive reactance $9 \Omega$ are connected in series with an AC source, then the impedance of the circuit is

$19 \Omega$

$11 \Omega$

$7 \Omega$

$5 \Omega$

Question 7: Palette 7/24

AP-EAPCET 2025 MCQ

A resistor of $450 \Omega$ and an inductor are connected in series to an AC source of frequency $\frac{75}{\pi} \mathrm{~Hz}$. If the power factor of the circuit is 0.6 , then the inductance connected in the circuit is

6 mH

4 H

4 mH

6 H

Question 8: Palette 8/24

AP-EAPCET 2025 MCQ

For better tuning of a series $L C R$ circuit in a communication system, the preferred combination is

$R=20 \Omega: L=15 \mathrm{H}: \mathrm{C}=35 \mu \mathrm{~F}$

$R=15 \Omega: L=40 \mathrm{H}: \mathrm{C}=20 \mu \mathrm{~F}$

$R=25 \Omega: L=15 \mathrm{H}: C=45 \mu \mathrm{~F}$

$R=15 \Omega: L=20 \mathrm{H}: C=45 \mu \mathrm{~F}$

Question 9: Palette 9/24

AP-EAPCET 2025 MCQ

In an LCR series circuit, if the potential differences across inductor, capacitor and resistor are $60 \mathrm{~V}, 30 \mathrm{~V}$ and 40 V respectively, then the AC voltage applied to the circuit is

50 V

70 V

130 V

60 V

Question 10: Palette 10/24

AP-EAPCET 2025 MCQ

The resonant frequency of an LC circuit is $f_0$. If a dielectric slab of constant 16 is inserted completely between the plates of the capacitor, then the resonant frequency is

$\frac{f}{2}$

$\frac{6}{4}$

$4 f$

Question 11: Palette 11/24

AP-EAPCET 2024 MCQ

An alternating current is given by $i=(3 \sin \omega t+4 \cos \omega t) \mathrm{A}$. The rms current will be

$\frac{7}{\sqrt{2}} \mathrm{~A}$

$\frac{1}{\sqrt{2}} \mathrm{~A}$

$\frac{5}{\sqrt{2}} \mathrm{~A}$

$\frac{3}{\sqrt{2}} \mathrm{~A}$

Question 12: Palette 12/24

AP-EAPCET 2024 MCQ

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

$1.014 \times 10^{-6} \mathrm{~F}$

$1.014 \times 10^{-3} \mathrm{~F}$

$2.6 \times 10^{-3} \mathrm{~F}$

$4.125 \times 10^{-3} \mathrm{~F}$

Question 13: Palette 13/24

AP-EAPCET 2024 MCQ

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

0.5 and $4 R$

1 and $2 R$

0.5 and $2 R$

1 and $4 R$

Question 14: Palette 14/24

AP-EAPCET 2024 MCQ

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

$24 \Omega$

$36 \Omega$

$12 \Omega$

$18 \Omega$

Question 15: Palette 15/24

AP-EAPCET 2024 MCQ

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)

$25 \times 10^{-1}$

$2.5 \times 10^{-4}$

$25 \times 10^{-2}$

$2.5 \times 10^{-2}$

Question 16: Palette 16/24

AP-EAPCET 2024 MCQ

A full wave rectifier circuit is operating from 50 Hz mains. The fundamental frequency in the ripple output will be

50 Hz

70.7 Hz

100 Hz

25 Hz

Question 17: Palette 17/24

AP-EAPCET 2024 MCQ

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 18 English

AP EAPCET 2024 - 19th May Evening Shift Physics - Alternating Current Question 18 English

4 A

$2 A$

5.4 A

5.8 A

Question 18: Palette 18/24

AP-EAPCET 2024 MCQ

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 17 English

Both with equal brightness

Both do not glow

Question 19: Palette 19/24

AP-EAPCET 2022 MCQ

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

$\tan ^{-1}(0.8)$

$\tan ^{-1}(0.25)$

$\tan ^{-1}(0.6)$

$\tan ^{-1}(0.5)$

Question 20: Palette 20/24

AP-EAPCET 2022 MCQ

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.

$1.5 \mathrm{k} \Omega$

$3 \mathrm{k} \Omega$

$6 \mathrm{k} \Omega$

$5.2 \mathrm{k} \Omega$

Question 21: Palette 21/24

AP-EAPCET 2022 MCQ

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

$\tan ^{-1}(1.5)$

$\tan ^{-1}(0.5)$

$\tan ^{-1}(1.73)$

$\tan ^{-1}(2)$

Question 22: Palette 22/24

AP-EAPCET 2021 MCQ

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

16 V

10 V

8 V

6 V

Question 23: Palette 23/24

AP-EAPCET 2021 MCQ

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

Nearly $1 \mathrm{~A}$

Nearly $2 \mathrm{~A}$

Nearly $1.4 \mathrm{~A}$

Nearly $2.8 \mathrm{~A}$

Question 24: Palette 24/24

AP-EAPCET 2021 MCQ

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

$\frac{f}{2}$

$2f$

$f$

$\frac{f}{4}$