A light bulb is rated at $$100$$ W for a $$220$$ V AC supply. The peak voltage of the source is:
1. $$220$$ V
2. $$110$$ V
3. $$311$$ V
4. $$100$$ V

Subtopic:  RMS & Average Values |
73%
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A light bulb is rated at $$100~\text{W}$$ for a $$220~\text{V}$$ AC supply. The RMS current through the bulb is:
1. $$0.243$$ A
2. $$0.454$$ A
3. $$0.222$$ A
4. $$0.312$$ A

Subtopic:  RMS & Average Values |
80%
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A pure inductor of $$25.0~\text{mH}$$ is connected to an AC source of $$220~\text{V}$$. The RMS current in the circuit is: (The frequency of the source is $$50~\text{Hz}$$)
1. $$20~\text{A}$$
2. $$25~\text{A}$$
3. $$28~\text{A}$$
4. $$32~\text{A}$$

Subtopic:  RMS & Average Values |
71%
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A lamp is connected in series with a capacitor. Predict your observations for dc and ac connections:

 1 When a dc source is connected to a capacitor, the lamp will not glow in a steady-state condition. 2 When an ac source is connected to a capacitor, the lamp will glow. 3 Both (1) and (2) are correct. 4 None of these.

Subtopic:  Different Types of AC Circuits |
84%
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A lamp is connected in series with a capacitor. AC and DC sources are connected to the circuit one by one, then mark the correct statement/s.

 1 when the DC source is connected to the capacitor, the lamp will not glow in a steady-state condition. 2 when the AC source is connected to the capacitor and the capacitance of the capacitor is reduced, the lamp will glow less brightly. 3 when the DC source is connected to the capacitor and the capacitance of the capacitor is reduced, the lamp will glow less brightly. 4 both (1) and (2).

Subtopic:  Different Types of AC Circuits |
76%
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A $$15.0~\mathrm{\mu F}$$ capacitor is connected to a $$220~\mathrm{V}$$, $$50~\mathrm{Hz}$$ source. If the frequency is doubled, what happens to the capacitive reactance and the current?

 1 the capacitive reactance is halved and the current is doubled. 2 the capacitive reactance is doubled and the current is halved. 3 the capacitive reactance remains the same and the current is doubled. 4 the current remains the same and the capacitive reactance is halved.

Subtopic:  Different Types of AC Circuits |
78%
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A light bulb and an open coil inductor are connected to an ac source through a key as shown in the figure.

The switch is closed and after some time, an iron rod is inserted into the interior of the inductor. The glow of the light bulb:

1. increases

2. decreases

3. is unchanged, as the iron rod is inserted

4. first increases and then decreases

Subtopic:  Different Types of AC Circuits |
73%
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A resistor of $$200~\mathrm{\Omega}$$ and a capacitor of $$15.0~\mu\text{F}$$ are connected in series to a $$220~\text{V}$$, $$50$$ Hz AC source. The voltage (RMS) across the resistor and the capacitor are respectively:
1. $$160.3 ~\text{V}, 160.3 ~\text{V}$$
2. $$151 ~\text{V}, 151 ~\text{V}$$
3. $$160.3 ~\text{V}, 151 ~\text{V}$$
4. $$151 ~\text{V}, 160.3 ~\text{V}$$

Subtopic:  Different Types of AC Circuits |
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Which one of the following is incorrect?

 1 For circuits used for transporting electric power, a low power factor implies large power loss in transmission. 2 Power factor can often be improved by the use of a capacitor of appropriate capacitance in the circuit. 3 For circuits used for transporting electric power, a low power factor implies low power loss in transmission. 4 Both (1) and (2)

Subtopic:  RMS & Average Values |
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A sinusoidal voltage of peak value 283 V and frequency 50 Hz is applied to a series LCR circuit in which R = 3$\Omega$L = 25.48 mH, and C = 796 µF. The impedance of the circuit is:

1. 5 $\Omega$

2. 8 $\Omega$

3. 4 $\Omega$

4. 2 $\Omega$

Subtopic:  Different Types of AC Circuits |
58%
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