Which of the following combinations should be selected for better tuning of an L-C-R circuit used for communication?

1. R=20Ω, L=1.5H,C=35 μF

2. R=25Ω, L=2.5H,C=45 μF

3. R=15Ω, L=3.5H,C=30 μF

4. R=25Ω, L=1.5H,C=45 μF

Subtopic:  Different Types of AC Circuits |
 70%
From NCERT
NEET - 2016
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The potential differences across the resistance, capacitance and inductance are \(80\) V, \(40\) V and \(100\) V respectively in an \(LCR\) circuit. What is the power factor of this circuit?
1. \(0.4\)
2. \(0.5\)
3. \(0.8\)
4. \(1.0\)

Subtopic:  Power factor |
 81%
From NCERT
NEET - 2016
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A small-signal voltage V(t)=Vo sinωt is applied across an ideal capacitor C 
(1) over a full cycle, the capacitor C does not consume any energy from the voltage source

(2) current I(t) is in phase with voltage V(t)

(3) current I(t) leads voltage V(t) by 180°

(4) current I(t) lags voltage V(t) by 90°

Subtopic:  Different Types of AC Circuits |
 70%
From NCERT
NEET - 2016
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A resistance 'R' draws power 'P' when connected to an AC source. If an inductance is now placed in series with the resistance, such that the impedance of the circuit becomes 'Z' the power drawn will be:

1. PRZ2
2. PRZ
3. PRZ
4. P 



Subtopic:  Different Types of AC Circuits |
 56%
From NCERT
NEET - 2015
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A transformer having efficiency of 90% is working on 200 V and 3 kW power supply. If the current in the secondary coil is 6A, the voltage across the secondary coil and the current in the primary coil respectively are
1. 300V,15A
2. 450V,15A

3. 450V,13.5A

4. 600V,15A

Subtopic:  Transformer |
 75%
From NCERT
NEET - 2014
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A coil of self-inductance \(L\) is connected in series with a bulb \(B\) and an AC source. The brightness of the bulb decreases when:
1. Frequency of the AC source is decreased
2. The number of turns in the coil is reduced
3. A capacitance of reactance \(X_C = X_L\) is included in the same circuit
4. An iron rod is inserted in the coil
Subtopic:  Different Types of AC Circuits |
 69%
From NCERT
NEET - 2013
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The instantaneous values of alternating

current and voltages in a circuit are given

as 

i=12sin(100πt) ampere
e=12sin(100πt+π/3) volt

The average power in Watts consumed in the

circuit is

(a) 14

(b) 34

(c) 12 

(d) 18

Subtopic:  Different Types of AC Circuits |
 70%
From NCERT
NEET - 2012
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An \(AC\) voltage is applied to a resistance \(R\) and an inductor \(L\) in series. If \(R\) and the inductive reactance are both equal to \(3~ \Omega, \) then the phase difference between the applied voltage and the current in the circuit will be:

1. \( \pi / 4\) 2. \( \pi / 2\)
3. zero 4. \( \pi / 6\)
Subtopic:  Different Types of AC Circuits |
 74%
From NCERT
NEET - 2011
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The rms value of potential difference V shown in the figure is

                        

(1) Vo                                                     

(2) Vo2

(3)Vo2                                                     

(4) Vo3   

Subtopic:  RMS & Average Values |
 77%
From NCERT
NEET - 2011
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A coil has resistance 30 Ω and inductive reactance 20 Ω at 50 Hz frequency. If an AC source of 200 V, 100 Hz, is connected across the coil, the current in the coil will be:

 1. 4.0 A                                           

 2. 8.0 A

 3. 2013A                                         

 4. 2.0 A

Subtopic:  Different Types of AC Circuits |
 51%
From NCERT
NEET - 2011
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