Alternating Current · Physics · MHT CET

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MCQ (Single Correct Answer)

MHT CET 2023 14th May Evening Shift
The power factor of an R-L circuit is $$\frac{1}{\sqrt{2}}$$. If the frequency of $$\mathrm{AC}$$ is doubled the power factor will now be
MHT CET 2023 14th May Evening Shift
An alternating voltage $$E=200 \sqrt{2} \sin (100 t)$$ volt is connected to a $$1 \mu \mathrm{f}$$ capacitor through an a.c. ammeter. The reading of t...
MHT CET 2023 14th May Evening Shift
What will be the phase difference between virtual voltage and virtual current when current in the circuit is wattless?
MHT CET 2023 14th May Evening Shift
A coil having an inductance of $$\frac{1}{\pi} \mathrm{H}$$ is connected in series with a resistance of $$300 \Omega$$. If $$20 \mathrm{~V}$$ from a $...
MHT CET 2023 14th May Morning Shift
An alternating voltage is applied to a series LCR circuit. If the current leads the voltage by $$45^{\circ}$$, then $$\left(\tan 45^{\circ}=1\right)$$...
MHT CET 2023 14th May Morning Shift
For a purely inductive or a purely capacitive circuit, the power factor is
MHT CET 2023 14th May Morning Shift
The reciprocal of the total effective resistance of LCR a.c. circuit is called
MHT CET 2023 13th May Evening Shift
The number of turns in the primary and the secondary of a transformer are 1000 and 3000 , respectively. If $$80 \mathrm{~V} \mathrm{~AC}$$ is applied ...
MHT CET 2023 13th May Evening Shift
A group of lamps having total power rating of $$1000 \mathrm{~W}$$ is supplied by an AC voltage of $$E=200 \sin \left(310 t+60^{\circ}\right)$$, the r...
MHT CET 2023 13th May Evening Shift
At a particular angular frequency, the reactance of capacitor and that of inductor is same. If the angular frequency is doubled, the ratio of the reac...
MHT CET 2023 13th May Evening Shift
In a $$L$$-$$R$$ circuit the inductive reactance is equal to the resistance $R$ in the circuit. An emf $$E=E_0 \cos \omega t$$ is applied to the circu...
MHT CET 2023 13th May Morning Shift
In an oscillating LC circuit, the maximum charge on the capacitor is '$$Q$$'. When the energy is stored equally between the electric and magnetic fiel...
MHT CET 2023 13th May Morning Shift
With increase in frequency of a.c. supply, the impedance of an L-C-R series circuit
MHT CET 2023 13th May Morning Shift
In an a.c. circuit the instantaneous current and emf are represented as $$\mathrm{I}=\mathrm{I}_0, \sin [\omega \mathrm{t}-\pi / 6]$$ and $$\mathrm{E}...
MHT CET 2023 12th May Evening Shift
When an inductor '$$L$$' and a resistor '$$R$$' in series are connected across a $$15 \mathrm{~V}, 50 \mathrm{~Hz}$$ a.c. supply, a current of $$0.3 \...
MHT CET 2023 12th May Evening Shift
An a.c. source of $$15 \mathrm{~V}, 50 \mathrm{~Hz}$$ is connected across an inductor (L) and resistance (R) in series R.M.S. current of $$0.5 \mathrm...
MHT CET 2023 12th May Evening Shift
Resistor of $$2\Omega$$, inductor of $$100 \mu \mathrm{H}$$ and capacitor of $$400 \mathrm{pF}$$ are connected in series across a source of $$\mathrm{...
MHT CET 2023 12th May Morning Shift
In the given circuit, r.m.s. value of current through the resistor $$\mathrm{R}$$ is ...
MHT CET 2023 12th May Morning Shift
In the given circuit, if $$\frac{\mathrm{dI}}{\mathrm{dt}}=-1 \mathrm{~A} / \mathrm{s}$$ then the value of $$\left(V_A-V_B\right)$$ at this instance w...
MHT CET 2023 12th May Morning Shift
An inductor of $$0.5 \mathrm{~mH}$$, a capacitor of $$20 ~\mu \mathrm{F}$$ and a resistance of $$20 \Omega$$ are connected in series with a $$220 \mat...
MHT CET 2023 11th May Evening Shift
The a.c. source is connected to series LCR circuit. If voltage across $$R$$ is $$40 \mathrm{~V}$$, that across $$\mathrm{L}$$ is $$80 \mathrm{~V}$$ an...
MHT CET 2023 11th May Evening Shift
In a series LCR circuit, $$\mathrm{C}=2 \mu \mathrm{F}, \mathrm{L}=1 \mathrm{mH}$$ and $$\mathrm{R}=10 \Omega$$. The ratio of the energies stored in t...
MHT CET 2023 11th May Evening Shift
The a.c. source of e.m.f. with instantaneous value '$$e$$' is given by $$e=200 \sin (50 t)$$ volt. The r.m.s. value of current in a circuit of resista...
MHT CET 2023 11th May Morning Shift
With the gradual increase in frequency of an a. c. source, the impedance of an LCR series circuit
MHT CET 2023 11th May Morning Shift
In series LCR circuit, the voltage across the inductance and the capacitance are not
MHT CET 2023 10th May Evening Shift
With an alternating voltage source of frequency '$$f$$', inductor '$$L$$', capacitor '$$C$$' and resistance '$$R$$' are connected in series. The volta...
MHT CET 2023 10th May Evening Shift
The capacitive reactance of a capacitor '$$C$$' is $$\mathrm{X} \Omega$$. Both, the frequency of a.c. supply and capacitance of the above capacitor ar...
MHT CET 2023 10th May Evening Shift
A $$100 \mathrm{~mH}$$ coil carries a current of $$1 \mathrm{~A}$$. Energy stored in the form of magnetic field is
MHT CET 2023 10th May Evening Shift
In the circuit given below, the current through inductor is $$0.9 \mathrm{~A}$$ and through the capacitor is $$0.6 \mathrm{~A}$$. The current drawn fr...
MHT CET 2023 10th May Morning Shift
The inductive reactance of a coil is '$$\mathrm{X}_{\mathrm{L}}$$'. If the inductance of a coil is tripled and frequency of a.c. supply is doubled, th...
MHT CET 2023 10th May Morning Shift
In the circuit shown the ratio of quality factor and the bandwidth is ...
MHT CET 2023 10th May Morning Shift
In a series LR circuit, $$X_L=R$$, power factor is $$P_1$$. If a capacitor of capacitance $$C$$ with $$X_C=X_L$$ is added to the circuit the power fac...
MHT CET 2023 9th May Evening Shift
An e.m.f. $$E=4 \cos (1000 t)$$ volt is applied to an LR circuit of inductance $$3 \mathrm{~mH}$$ and resistance $$4 ~\Omega$$. The maximum current in...
MHT CET 2023 9th May Evening Shift
An alternating voltage of frequency '$$\omega$$' is induced in electric circuit consisting of an inductance '$$L$$' and capacitance '$$C$$', connected...
MHT CET 2023 9th May Evening Shift
The reactance of capacitor at $$50 \mathrm{~Hz}$$ is $$5 \Omega$$. If the frequency is increased to $$100 \mathrm{~Hz}$$, the new reactance is
MHT CET 2023 9th May Morning Shift
The coil of an a.c. generator has 100 turns, each of cross-sectional area $$2 \mathrm{~m}^2$$. It is rotating at constant angular speed $$30 ~\mathrm{...
MHT CET 2023 9th May Morning Shift
A capacitor, an inductor and an electric bulb are connected in series to an a.c. supply of variable frequency. As the frequency of the supply is incre...
MHT CET 2023 9th May Morning Shift
In an $$\mathrm{AC}$$ circuit, the current is $$\mathrm{i}=5 \sin \left(100 \mathrm{t}-\frac{\pi}{2}\right) \mathrm{A}$$ and voltage is $$\mathrm{e}=2...
MHT CET 2022 11th August Evening Shift
A capacitor of capacitance $$50 \mu \mathrm{F}$$ is connected to a.c. source $$\mathrm{e}=220 \sin 50 \mathrm{t}$$ ($$\mathrm{e}$$ in volt, $$\mathrm{...
MHT CET 2022 11th August Evening Shift
The resistance offered by an inductor $$\left(X_L\right)$$ in an a.c. circuit is
MHT CET 2022 11th August Evening Shift
A coil having an inductance of $$\frac{1}{\pi} \mathrm{H}$$ is connected in series with a resistance of $$300 \Omega$$. If A.C. Source $$(20 \mathrm{~...
MHT CET 2022 11th August Evening Shift
In a full wave rectifier circuit without filter, the output current is
MHT CET 2021 22th September Evening Shift
A capacitor of capacity '$$C$$' is charged to a potential '$$V$$'. It is connected in parallel to an inductor of inductance '$$\mathrm{L}$$'. The maxi...
MHT CET 2021 22th September Evening Shift
A step down transformer is used to reduce the main supply from '$$V_1$$' volt to '$$V_2$$' volt. The primary coil draws a current '$$\mathrm{I}_1$$' $...
MHT CET 2021 22th September Evening Shift
For the circuit shown below, instantaneous current through inductor '$$\mathrm{L}$$' and capacitor '$$\mathrm{C}$$' is respectively. ...
MHT CET 2021 22th September Evening Shift
A parallel plate capacitor having plates of radius 6 cm has capacitance 100 pF. It is connected to 230 V a.c. supply with angular frequency 300 rad/s....
MHT CET 2021 22th September Evening Shift
A step down transformer has turns ratio $$20: 1$$. If $$8 \mathrm{~V}$$ is applied across $$0.4 \mathrm{~ohm}$$ secondary then the primary current wil...
MHT CET 2021 21th September Evening Shift
In LCR series resonant circuit, at resonance, voltage across 'L' and 'C' will cancel each other because they are
MHT CET 2021 21th September Evening Shift
The inductive reactance of a coil is R$$\Omega$$. If the inductance of a coil is doubled and frequency of a.c. supply is also doubled then the new ind...
MHT CET 2021 21th September Evening Shift
Three pure inductors each of inductance 6H are connected as shown in the figure. Their equivalent inductance between the points 'P' and 'Q' is ...
MHT CET 2021 21th September Evening Shift
The instantaneous value of an alternating current is given by $$\mathrm{i}=50 \sin (100 \pi \mathrm{t})$$. It will achieve a value of $$25 \mathrm{~A}...
MHT CET 2021 21th September Evening Shift
In a step up transformer, which one of the following statements is correct?
MHT CET 2021 21th September Morning Shift
In the graphical representation of e.m.f. '$$\mathrm{e}$$' and current '$$\mathrm{i}$$' versus '$$\omega \mathrm{t}$$' for an a.c. circuit, both emf a...
MHT CET 2021 21th September Morning Shift
An alternating voltge is represented by $$\mathrm{V}=80 \sin (100 \pi \mathrm{t}) \cos (100 \pi \mathrm{t})$$ volt. The peak voltage is
MHT CET 2021 21th September Morning Shift
A series combination of resistor 'R' and capacitor 'C' is connected to an a.c. source of angular frequency '$$\omega$$'. Keeping the voltage same, if ...
MHT CET 2021 20th September Evening Shift
An inductive coil has a resistance of $$100 ~\Omega$$. When an a.c. signal of frequency $$1000 \mathrm{~Hz}$$ is applied to the coil the voltage leads...
MHT CET 2021 20th September Evening Shift
In an ideal step down transformer, out of the following quantities, which quantity increases in the secondary coil?
MHT CET 2021 20th September Evening Shift
A series LCR circuit with resistance (R) $$500 ~\mathrm{ohm}$$ is connected to an a.c. source of $$250 \mathrm{~V}$$. When only the capacitance is rem...
MHT CET 2021 20th September Morning Shift
When a d.c. voltage of $$200 \mathrm{~V}$$ is applied to a coil of self-inductance $$\left(\frac{2 \sqrt{3}}{\pi}\right) \mathrm{H}$$, a current of $$...
MHT CET 2021 20th September Morning Shift
An inductor coil wound uniformly has self inductance 'L' and resistance 'R'. The coil is broken into two identical parts. The two parts are then con...
MHT CET 2021 20th September Morning Shift
An inductor coil takes current 8A when connected to an 100 V and 50 Hz a.c. source. A pure resistor under the same condition takes current of 10A. If ...
MHT CET 2020 16th October Morning Shift
An alternating emf of $$0.2 \mathrm{~V}$$ is applied across an L-C-R series circuit having $$R=4 \Omega, C=80 \mu \mathrm{F}$$ and $$L=200 \mathrm{~mH...
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