Which of the following plots may represent the reactance of a series LC combination?
                      
Correct option:

1.  a

2.  b

3.  c

4.  d

Subtopic:  Different Types of AC Circuits |
 51%
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A series AC circuit has a resistance of 4  Ω and a reactance of 3. Ω. The impedance of the circuit is

1.  5 Ω

2.  7 Ω

3.  12/7 Ω

4.  7/12 Ω

Subtopic:  Different Types of AC Circuits |
 90%
From NCERT
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Transformers are used

1.  in DC circuits only

2.  in AC circuits only

3.  in both DC and AC circuits

4.  neither in DC nor in AC circuits

Subtopic:  Transformer |
 81%
From NCERT
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An alternating current is given by 
\(i=i_1 \cos \omega t+i_2 \sin \omega t\)
The rms current is given by:

1.    \(\frac{i_{1}+i_{2}}{\sqrt{2}}\)

2.  \(\frac{\left|i_{1}-i_{2}\right|}{\sqrt{2}}\)

3.   \(\sqrt{\frac{i_{1}^{2}+i_{2}^{2}}{2}}\)

4.  \(\sqrt{\frac{i_{1}^{2}+i_{2}^{2}}{\sqrt{2}}}\)

Subtopic:  RMS & Average Values |
 85%
From NCERT
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An alternating current having a peak value \(14~\text A\) is used to heat a metal wire. To produce the same heating effect, a constant current \(i\) can be used, where the value of \(i\) is:
1. \(14~\text A\) 
2. about \(20~\text A\) 
3. \(7~\text A\) 
4. about \(10~\text A\) 

Subtopic:  Power factor |
 66%
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A constant current of 2.8 A exists in a resistor. The RMS current is

1.  2.8 A

2.  about 2 A

3.  1.4 A

4.  undefined for a direct current

Subtopic:  RMS & Average Values |
 51%
From NCERT
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An inductor, a resistor and a capacitor are joined in series with an AC source. As the frequency of the source is slightly increased from a very low value, the reactance,
(a) of the inductor increases.
(b) of the resistor increases.
(c) of the capacitor increases.
(d) of the circuit increases.
Choose the correct options: 
1. (a) only 2. (b), (c)
3. (c), (d) 4. (a), (d)
Subtopic:  Different Types of AC Circuits |
 61%
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The reactance of a circuit connected to an AC circuit is zero. It is possible that the circuit contains 

(a) an inductor and a capacitor
(b) an inductor but no capacitor
(c) a capacitor but no inductor
(d) neither an inductor nor a capacitor

Choose the correct option

1.  (a) only

2. (b), (c)

3. (c), (d)

4. (a), (d)

Subtopic:  Different Types of AC Circuits |
 58%
From NCERT
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In an AC series circuit, the instantaneous current is zero when the instantaneous voltage is maximum. Connected to the source may be a:

(a) pure inductor.
(b) pure capacitor.
(c) pure resistor.
(d) combination of an inductor and a capacitor.

Choose the correct option:

1. (a), (b), (d)
2. (b), (c), (a)
3. (c), (d), (a)
4. (a), (d), (c), (b)

Subtopic:  Different Types of AC Circuits |
 69%
From NCERT
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An inductor coil having some resistance is connected to an AC source. Which of the following quantities have zero average value over a cycle?

(A) Current
(B) Induced EMF in the inductor
(C) Joule heat
(D) Magnetic energy stored in the inductor


Choose the correct option from the options given below:

1. (A) only
2. (B) and (C) only
3. (C) and (D) only
4. (A) and (B) only

Subtopic:  RMS & Average Values |
 58%
From NCERT
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