A coil of inductive reactance of 31 Ω has a resistance of 8 Ω. It is placed in series with a condenser of capacitive reactance 25 Ω. The combination is connected to an a.c. source of 110 V. The power factor of the circuit is:

1. 0.56

2. 0.64

3. 0.80

4. 0.33

Subtopic:  Power factor |
 84%
From NCERT
AIPMT - 2006
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A 220 V input is supplied to a transformer. The output circuit draws a current of 2.0 A at 440 V. What is the current drawn by the primary windings of the transformer if the efficiency of the transformer is 80%?

1. 3.6 A
2. 2.8 A
3. 2.5 A
4. 5.0 A

Subtopic:  Transformer |
 73%
From NCERT
AIPMT - 2010
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An alternating voltage source is connected to a series R-C circuit. Consider two situations:

1. When the capacitor is air-filled. 
2. When the capacitor is mica filled. 


If the current through the resistor is I and the voltage across the capacitor is V, then:
1. \(V_a < V_b\)
2. \(V_a > V_b\)
3. \(i_a > i_b\)
4. \(V_a = V_b\)

Subtopic:  Different Types of AC Circuits |
 65%
From NCERT
NEET - 2015
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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:  Power factor |
 59%
From NCERT
NEET - 2015
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The diagram shows a capacitor C and a resistor R connected in series to an ac source. V1 and V2 are voltmeters and A is an ammeter.

   

Consider now the following statements

I. Readings in A and V2 are always in phase
II. Reading in V1 is ahead in phase with reading in V2
III. Readings in A and V1 are always in phase

Which of these statements is/are correct?

1. I only 2. II only
3. I and II only 4. II and III only
Subtopic:  Different Types of AC Circuits |
 60%
From NCERT
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The figure shows the variation of R, XL, and XC with frequency f in a series of L, C, and R circuits. For which frequency point is the circuit inductive?

1. A 2. B
3. C 4. All points
Subtopic:  Different Types of AC Circuits |
 54%
From NCERT
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One 10 V, 60 W bulb is to be connected to 100 V line. The required induction coil has a self-inductance of value: (f = 50 Hz) 

1. 0.052 H

2. 2.42 H

3. 16.2 mH

4. 1.62 mH

Subtopic:  Different Types of AC Circuits |
 53%
From NCERT
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In an LCR series network, VL=40 V, VC=20 V and VR=15 V. The supply voltage will be:

1.  25 V

2.  75 V

3.  35 V

4.  Zero

Subtopic:  Different Types of AC Circuits |
 88%
From NCERT
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An alternating current is given as i = icos \(\omega t\) - isin \(\omega t\). The value of rms current is given by:
1. \( \frac{1}{\sqrt{2}}\left(i_1+i_2\right) \)
2. \( \frac{1}{\sqrt{2}}\left(i_i+i_2\right)^2 \)
3. \( \frac{1}{\sqrt{2}}\left(i_1^2+i_2^2\right)^{1 / 2} \)
4. \( \frac{1}{2}\left(i_1^2+i_2^2\right)^{1 / 2}\)

Subtopic:  RMS & Average Values |
 81%
From NCERT
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In a step-up transformer, the turn ratio is 1:2 . A Leclanche cell (e.m.f. 1.5 V) is connected across the primary coil. What would be the voltage developed in the secondary coil?

1. 3.0 V 2. 0.75 V
3. 1.5 V 4. Zero
Subtopic:  Transformer |
From NCERT
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