Q. No.The variation of EMF with time for four types of generators is shown in the figures. Which amongst them can be called AC voltage?
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| (a) | (b) |
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| (c) | (d) |
Choose the correct option from the given ones:
| 1. | (a) and (d) |
| 2. | (a), (b), (c), and (d) |
| 3. | (a) and (b) |
| 4. | only (a) |
| 1. | about 14 A14 A | 2. | about 28 A28 A |
| 3. | about 20 A20 A | 4. | cannot say |
A light bulb is rated at 100 W100 W for a 220 V220 V AC supply. The RMS current through the bulb is:
1. 0.2430.243 A
2. 0.4540.454 A
3. 0.2220.222 A
4. 0.3120.312 A
| 1. | 100 mA100 mA | 2. | 200 mA200 mA |
| 3. | 20 mA20 mA | 4. | 10 mA10 mA |
| 1. | 1/√21/√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. | √2√2 times the rms value of the AC source. |
1. 0.707 A0.707 A
2. 1 A1 A
3. 1.414 A1.414 A
4. 2 A2 A
An AC source is rated 220 V220 V, 50 Hz50 Hz. The average voltage is calculated in a time interval of 0.01 s0.01 s. It,
| 1. | must be zero |
| 2. | may be zero |
| 3. | is never zero |
| 4. | is 220√2220√2 V |
A 15.0 μF15.0 μF capacitor is connected to a 220 V,220 V, 50 Hz50 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. |
A resistor of 200 Ω200 Ω and a capacitor of 15.0 μF15.0 μF are connected in series to a 220 V220 V, 5050 Hz AC source. The voltage (RMS) across the resistor and the capacitor are respectively:
1. 160.3 V,160.3 V160.3 V,160.3 V
2. 151 V,151 V151 V,151 V
3. 160.3 V,151 V160.3 V,151 V
4. 151 V,160.3 V151 V,160.3 V
| 1. | 60∘60∘ | 2. | 90∘90∘ |
| 3. | 30∘30∘ | 4. | 45∘45∘ |
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