An AC source is rated 220 V, 50 Hz. The average voltage is calculated in a time interval of 0.01 s. It 

1.  must be zero

2.  may be zero

3.  is never zero

4.  is (220\(\sqrt2\) ) V

Subtopic:  RMS & Average Values |
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The magnetic field energy in an inductor changes from maximum value to minimum value in 5.0 ms when connected to an AC source. The frequency of the source is:
1. 20 Hz
2. 50 Hz
3. 200 Hz
4. 500 Hz

Subtopic:  LC Oscillations |
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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 |
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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 |
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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 |
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An alternating current is given by 

i – i1 cos ωt + i2 sin ωt

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 |
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An alternating current having peak value 14 A is used to heat a metal wire. To produce the same heating effect, a constant current i can be used where i is

1.  14 A

2.  about 20 A

3.  7 A

4.  about 10 A

Subtopic:  Power factor |
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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 |
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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 option 

1. (a) only

2. (b), (c)

3. (c), (d)

4. (a), (d)

Subtopic:  Different Types of AC Circuits |
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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 |
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