Alternating Current · Physics · COMEDK
Start PracticeMCQ (Single Correct Answer)
COMEDK 2023 Morning Shift
The instantaneous values of alternating current and voltages in a circuit given as
$$\begin{aligned}
& i=\frac{1}{\sqrt{2}} \sin (100 \pi t) \mathrm{a...
COMEDK 2023 Morning Shift
In the series L-C-R circuit shown, the impedance is
...
COMEDK 2023 Morning Shift
In the case of an inductor
COMEDK 2023 Morning Shift
In an electrical circuit $$R, L, C$$ and $$\mathrm{AC}$$ voltage source are all connected in series. When $$L$$ is removed from the circuit, the phase...
COMEDK 2023 Evening Shift
$$220 \mathrm{~V}$$ ac is more dangerous than $$220 \mathrm{~V}$$ dc Why?
COMEDK 2023 Evening Shift
What should be the inductance of an inductor connected to $$200 \mathrm{~V}, 50 \mathrm{~Hz}$$ source so that the maximum current of $$\sqrt{2}$$ A fl...
COMEDK 2022
During the phenomenon of resonance
COMEDK 2022
A DC ammeter and a hot wire ammeter are connected to a circuit in series. When a direct current is passed through circuit, the DC ammeter shows 6 A. W...
COMEDK 2022
A series L-C-R circuit is connected to an AC source of 220 V and 50 Hz shown in figure. If the readings of the three voltmeters $$V_1,V_2$$ and $$V_3$...
COMEDK 2022
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 cir...
COMEDK 2022
The AC voltage across a resistance can be measured using a
COMEDK 2021
The formula of capacitative reactance is
COMEDK 2021
For the same resonant frequency, if L is changed from L to $${L \over 3}$$, then capacitance should change from C to
COMEDK 2021
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 th...
COMEDK 2021
If impedance is $$\sqrt3$$ times of resistance, then find phase difference.
COMEDK 2020
For a series L-C-R circuit at resonance, which statement is not true?