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Q. No.If the RMS current in a 50 Hz AC circuit is 5 A, the value of the current 1300 s after its value becomes zero is:
| 1. | 5√2 A | 2. | 5√32 A |
| 3. | √56 A | 4. | 5√2 A |
Subtopic: Different Types of AC Circuits |
67%
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An alternating current generator has an internal resistance Rg and an internal reactance Xg. It is used to supply power to a passive load consisting of a resistance Rg and a reactance XL. For maximum power to be delivered from the generator to the load, the value of XL is equal to:
1. zero
2. Xg
3. −Xg
4. Rg
Subtopic: Different Types of AC Circuits |
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When a voltage measuring device is connected to AC mains, the meter shows the steady input voltage of 220 V. This means:
| 1. | input voltage cannot be AC voltage, but a DC voltage |
| 2. | maximum input voltage is 220 V |
| 3. | the meter reads not v but <v2> and is calibrated to read √<v2> |
| 4. | the pointer of the meter is stuck by some mechanical defect |
Subtopic: RMS & Average Values |
71%
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Which of the following combinations should be selected for better tuning of an LCR circuit used for communication?
1. R=20 Ω, L=1.5 H, C=35 μF
2. R=25 Ω, L=2.5 H, C=45 μF
3. R=15 Ω, L=3.5 H, C=30 μF
4. R=25 Ω, L=1.5 H, C=45 μF
Subtopic: Different Types of AC Circuits |
67%
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An inductor of reactance 1 Ω and a resistor of 2 Ω are connected in series to the terminals of a 6 V (RMS) AC source. The power dissipated in the circuit is:
1. 8 W
2. 12 W
3. 14.4 W
4. 18 W
Subtopic: Different Types of AC Circuits |
69%
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The output of a step-down transformer is measured to be 24 V when connected to a 12 W light bulb. The value of the peak current is:
| 1. | 1√2 A | 2. | √2 A |
| 3. | 2 A | 4. | 2√2 A |
Subtopic: Transformer |
71%
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As the frequency of an AC circuit increases, the current first increases and then decreases. What combination of circuit elements is most likely to comprise the circuit?
Choose the correct options:
1. (b), (c)
2. (c), (d)
3. (b), (d)
4. (a), (d)
| (a) | Inductor and capacitor |
| (b) | Resistor and inductor |
| (c) | Resistor and capacitor |
| (d) | Resistor, inductor, and capacitor |
1. (b), (c)
2. (c), (d)
3. (b), (d)
4. (a), (d)
Subtopic: Different Types of AC Circuits |
56%
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In an alternating current circuit consisting of elements in series, the current increases on increasing the frequency of the supply. Which of the following elements are likely to constitute the circuit?
| (a) | Only resistor |
| (b) | Resistor and an inductor |
| (c) | Resistor and a capacitor |
| (d) | Only a capacitor |
Choose the correct options:
| 1. | (b), (c) | 2. | (a), (d) |
| 3. | (b), (d) | 4. | (c), (d) |
Subtopic: Different Types of AC Circuits |
69%
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Electrical energy is transmitted over large distances at high alternating voltages. Which of the following statements is (are) correct?
Choose the correct options:
| (a) | For a given power level, there is a lower current. |
| (b) | Lower current implies less power loss. |
| (c) | Transmission lines can be made thinner. |
| (d) | It is easy to reduce the voltage at the receiving end using step-down transformers. |
| 1. | (a), (b), (c) | 2. | (a), (b), (d) |
| 3. | (b), (c), (d) | 4. | (c), (d) |
Subtopic: Transformer |
61%
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For an LCR circuit, the power transferred from the driving source to the driven oscillator is P=I2Zcosϕ.
Choose the correct options:
1. (a), (b), (c)
2. (a), (c), (d)
3. (b), (c), (d)
4. (c), (d)
| (a) | Here, the power factor cosϕ≥0, P≥0. |
| (b) | The driving force can give no energy to the oscillator (P=0) in some cases. |
| (c) | The driving force cannot syphon out (P<0) the energy out of the oscillator. |
| (d) | The driving force can take away energy out of the oscillator. |
Choose the correct options:
1. (a), (b), (c)
2. (a), (c), (d)
3. (b), (c), (d)
4. (c), (d)
Subtopic: Different Types of AC Circuits |
55%
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