The variation of EMF with time for four types of generators is shown in the figures. Which amongst them can be called AC voltage?

 (a) (b) (c) (d)

 1 (a) and (d) 2 (a), (b), (c), and (d) 3 (a) and (b) 4 only (a)

Subtopic: Â AC vs DC |
Â 78%
From NCERT
NEET - 2019
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In a heating arrangement, an alternating current having a peak value of $$28~\text{A}$$ is used. To produce the same heat energy, if direct current is used to produce the same amount of heat, then its magnitude will be:
 1 about $$14~\text{A}$$ 2 about $$28~\text{A}$$ 3 about $$20~\text{A}$$ 4 cannot say
Subtopic: Â AC vs DC |
Â 56%
From NCERT
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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: Â RMS & Average Values |
Â 79%
From NCERT
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In an AC circuit, an alternating voltage $$\varepsilon=200 \sqrt{2} \sin (100 t)~\text{V}$$ is connected to a capacitor of capacity $$1~\mu \text{F}.$$ The RMS value of the current in the circuit is:
 1 $$100~\text{mA}$$ 2 $$200~\text{mA}$$ 3 $$20~\text{mA}$$ 4 $$10~\text{mA}$$
Subtopic: Â RMS & Average Values |Â Different Types of AC Circuits |
Â 76%
From NCERT
AIPMT - 2011
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The peak voltage of the AC source is equal to:
 1 $$1 / \sqrt{2}$$ times the rms value of the AC source. 2 the value of voltage supplied to the circuit. 3 the rms value of the AC source. 4 $$\sqrt{2}$$ times the rms value of the AC source.
Subtopic: Â RMS & Average Values |
Â 76%
From NCERT
NEET - 2022
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A standard filament lamp consumes $$100$$ W when connected to $$200$$ V AC mains supply. The peak current through the bulb will be:
1. $$0.707$$ A
2. $$1$$ A
3. $$1.414$$ A
4. $$2$$ A
Subtopic: Â RMS & Average Values |
Â 70%
From NCERT
NEET - 2022
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An AC source is rated $$220~\mathrm{V}$$, $$50~\mathrm{Hz}$$. The average voltage is calculated in a time interval of $$0.01~\mathrm{s}$$. It,

 1 must be zero 2 may be zero 3 is never zero 4 is $$220\sqrt{2}$$ V

Subtopic: Â RMS & Average Values |
Â 52%
From NCERT
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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: Â Different Types of AC Circuits |
Â 78%
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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: Â Different Types of AC Circuits |
From NCERT
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An AC source is connected to the given circuit. The value of $$\phi$$ will be:
 1 $$60^\circ$$ 2 $$90^\circ$$ 3 $$30^\circ$$ 4 $$45^\circ$$