The power factor of a good choke coil is:

(1) Nearly zero

(2) Exactly zero

(3) Nearly one

(4) Exactly one

Subtopic:  Different Types of AC Circuits |
 51%
From NCERT
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L, C and R represent physical quantities inductance, capacitance and resistance respectively. The combination representing the dimension of frequency will be:

1. LC

2. (LC)–1/2

3. LC1/2

4. CL

Subtopic:  Different Types of AC Circuits |
 85%
From NCERT
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In an ac circuit, a resistance of R ohm is connected in series with an inductance L. If the phase angle between voltage and current is 45°, the value of inductive reactance will be:

1. \(\frac{R}{4}\)
2. \(\frac{R}{2}\)
3. R
4. Cannot be found with the given data

Subtopic:  Different Types of AC Circuits |
 80%
From NCERT
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The phase difference between the current and voltage of LCR circuit in series combination at resonance is 

(1) 0

(2) π/2

(3) π

(4) –π

Subtopic:  LC Oscillations (OLD NCERT) |
 74%
From NCERT
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In a series resonant circuit, the ac voltage across resistance R, inductance L and capacitance C are 5 V, 10 V and 10 V respectively. The ac voltage applied to the circuit will be 

(1) 20 V

(2) 10 V

(3) 5 V

(4) 25 V

Subtopic:  LC Oscillations (OLD NCERT) |
 88%
From NCERT
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In a series LCR circuit, resistance R = 10Ω and the impedance Z = 20Ω. The phase difference between the current and the voltage is 

(1) 30°

(2) 45°

(3) 60°

(4) 90°

Subtopic:  Different Types of AC Circuits |
 82%
From NCERT
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In the circuit shown below, the ac source has voltage V=20cos(ωt) volts with ω = 2000 rad/sec.  The amplitude of the current is closest to:
         

1. 2 A

2. 3.3 A

3. 2/5  A

4. 5  A

Subtopic:  Different Types of AC Circuits |
 54%
From NCERT
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In an ac circuit the reactance of a coil is \(\sqrt{3}\) times its resistance, the phase difference between the voltage across the coil to the current through the coil will be:
1. \( \pi / 3 \)
2. \( \pi / 2 \)
3. \( \pi / 4 \)
4. \( \pi / 6\)

Subtopic:  Different Types of AC Circuits |
 76%
From NCERT
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The power factor of an ac circuit having resistance (R) and inductance (L) connected in series and an angular velocity ω is 

(1) R/ωL

(2) R/(R2+ω2L2)1/2

(3) ωL/R

(4) R/(R2ω2L2)1/2

Subtopic:  Different Types of AC Circuits |
 84%
From NCERT
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An inductor of inductance L and resistor of resistance R are joined in series and connected by a source of frequency ω. The power dissipated in the circuit is:

1. (R2+ω2L2)V

2. V2R(R2+ω2L2)

3. V(R2+ω2L2)

4. R2+ω2L2V2

Subtopic:  Power factor |
 79%
From NCERT
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