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Q. No.Turn ratio of a step-up transformer is \(1: 25\). If current in load coil is \(2~\text{A}\),
then the current in primary coil will be:
1.
\(25~\text{A}\)
2.
\(50~\text{A}\)
3.
\(0.25~\text{A}\)
4.
\(0.5~\text{A}\)
Subtopic: Transformer |
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Subtopic: Different Types of AC Circuits |
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A series \(LCR\) circuit containing \(5.0~\text{H}\) inductor, \(80~\mu \text{F}\) capacitor and \(40~\Omega\) resistor is connected to \(230~\text{V}\) variable frequency AC source. The angular frequencies of the source at which power transferred to the circuit is half the power at the resonant angular frequency are likely to be:
| 1. | \(46~\text{rad/s}~\text{and}~54~\text{rad/s}\) |
| 2. | \(42~\text{rad/s}~\text{and}~58~\text{rad/s}\) |
| 3. | \(25~\text{rad/s}~\text{and}~75~\text{rad/s}\) |
| 4. | \(50~\text{rad/s}~\text{and}~25~\text{rad/s}\) |
Subtopic: Different Types of AC Circuits |
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A condenser of capacity C is charged to a potential difference of V1. The plates of the condenser are then connected to an ideal inductor of inductance L. The current through the inductor, when the potential difference across the condenser reduces to V2 is:
1.
2.
3.
4.
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A coil has a resistance of \(30~ \text{ohm}\) and inductive reactance of \(20 ~\text{ohm}\) at a \(50~\text{Hz}\) frequency. If an \(AC\) source of \(200~\text{volts,}\) \(100~\text{Hz}\) is connected across the coil, the current in the coil will be:
| 1. | \(2.0~\text{A}\) | 2. | \(4.0~\text{A}\) |
| 3. | \(8.0~\text{A}\) | 4. | \(20/\sqrt{13}~\text{A}\) |
Subtopic: Different Types of AC Circuits |
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The rms value of the potential difference \(V\) shown in the figure is:
| 1. | \(\dfrac{V_{0}}{\sqrt{3}}\) | 2. | \(V_{0}\) |
| 3. | \(\dfrac{V_{0}}{\sqrt{2}}\) | 4. | \(\dfrac{V_{0}}{2}\) |
Subtopic: RMS & Average Values |
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The instantaneous values of alternating current and voltages in a circuit are given as,
\(i=\frac{1}{\sqrt{2}}\sin\left(100\pi t \right )~\text{Ampere}\)
\(e=\frac{1}{\sqrt{2}}\sin\left(100\pi t+\pi /3 \right)~\text{Volt}\)
What is the average power consumed by the circuit in watts?
\(i=\frac{1}{\sqrt{2}}\sin\left(100\pi t \right )~\text{Ampere}\)
\(e=\frac{1}{\sqrt{2}}\sin\left(100\pi t+\pi /3 \right)~\text{Volt}\)
What is the average power consumed by the circuit in watts?
| 1. | \( \frac{\sqrt{3}}{4} \) | 2. | \( \frac{1}{2} \) |
| 3. | \( \frac{1}{8} \) | 4. | \( \frac{1}{4}\) |
Subtopic: Power factor |
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When does the voltage in a series \(LCR\) circuit lead the current? (Given that \(\omega_0=\) resonant angular frequency)
1. \(\omega < \omega_0\)
2. \(\omega = \omega_0\)
3. \(\omega > \omega_0\)
4. None of these
1. \(\omega < \omega_0\)
2. \(\omega = \omega_0\)
3. \(\omega > \omega_0\)
4. None of these
Subtopic: Different Types of AC Circuits |
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In a series \(LC\) circuit, if \(L = 10^{-3}~\text{H}\) and \(C = 3\times 10^{-7}~\text{F}\) is connected to a \(\left(100~\text{V},50~\text{Hz}\right)\) AC source, the impedance of the circuit is:
| 1. | \(\dfrac{10^{5}}{3\pi}-10\pi\) | 2. | \(0.1\pi-3\times 10^{-5}\pi\) |
| 3. | \(\dfrac{10^{5}}{3\pi}-\dfrac{\pi}{10}\) | 4. | None of these |
Subtopic: Different Types of AC Circuits |
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In a series \(LCR\) circuit, the phase difference between voltage across \(L\) and voltage across \(C\) is equal to:
1. Zero
2. \(\pi\)
3. \(\dfrac{\pi}{2}\)
4. \(2\pi\)
1. Zero
2. \(\pi\)
3. \(\dfrac{\pi}{2}\)
4. \(2\pi\)
Subtopic: Different Types of AC Circuits |
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