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Q. No.The current flowing through an AC circuit is given by
\(I=5 \sin (120 \pi t)~\text{A}\)
How long will the current take to reach the peak value starting from zero?
1. \(\frac{1}{60}~\text{s} \)
2. \(60~\text{s} \)
3. \(\frac{1}{120}~\text{s} \)
4. \(\frac{1}{240}~\text{s} \)
Subtopic: Ā RMS & Average Values |
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Level 2: 60%+
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What material is used to make the core of a transformer?
1. Copper
2. Aluminium
3. Soft iron
4. Steel
1. Copper
2. Aluminium
3. Soft iron
4. Steel
Subtopic: Ā Transformer |
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Level 2: 60%+
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The correct representation of the variation of capacitative reactance \(X_C\) with frequency \(f\) is:
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Ā Different Types of AC Circuits |
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Level 1: 80%+
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The core of the transformer is laminated so that:
1. the copper loss is minimized.
2. the eddy current loss is minimized.
3. the rusting of the core is stopped.
4. the change in flux is increased.
1. the copper loss is minimized.
2. the eddy current loss is minimized.
3. the rusting of the core is stopped.
4. the change in flux is increased.
Subtopic: Ā Transformer |
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Level 1: 80%+
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A transmission line feeds input power at \(2200~\text{V}\) to a step-down transformer having a primary winding of \(1000\) turns. To get the output power at \(220~\text{V},\) the number of turns in the secondary winding will be:
1. \(50\)
2. \(100\)
3. \(1000\)
4. \(10000\)
1. \(50\)
2. \(100\)
3. \(1000\)
4. \(10000\)
Subtopic: Ā Transformer |
Ā 80%
Level 1: 80%+
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A resistance of \(5~\Omega\) is connected in series with a capacitance of \(1~\text{mF}\). The combination is connected to an AC source of angular frequency \(200~\text{rad/s}\). Then:
| 1. | voltage leads the current by \(60^\circ\) |
| 2. | current leads the voltage by \(60^\circ\) |
| 3. | current leads the voltage by \(45^\circ\) |
| 4. | voltage leads the current by \(45^\circ\) |
Subtopic: Ā Different Types of AC Circuits |
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Level 1: 80%+
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In a series \(LCR\) circuit, the inductance, capacitance and resistance are \(L = 100~\text{mH}\), \(C = 100~\mu\text{F}\) and \(R =10~\Omega\) respectively. They are connected to an AC source of voltage \(220~\text{V}\) and frequency of \(50~\text{Hz}\). The approximate value of current in the circuit will be:
1. \(15~\text{A}\)
2. \(32~\text{A}\)
3. \(22~\text{A}\)
4. \(14~\text{A}\)
1. \(15~\text{A}\)
2. \(32~\text{A}\)
3. \(22~\text{A}\)
4. \(14~\text{A}\)
Subtopic: Ā Different Types of AC Circuits |
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Level 1: 80%+
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A sinusoidal voltage \(V(t) = 210\sin(3000 t)~\text{V}\) is applied to a series \(LCR\) circuit in which \(L = 10~\text{mH}\), \(C= 25~\mu\text{F}\) and \(R = 100~\Omega\). The phase difference \((\phi)\) between the applied voltage and resultant current will be:
1. \(\text{tan}^{-1}(0.17)\)
2. \(\text{tan}^{-1}(9.46)\)
3. \(\text{tan}^{-1}(0.30)\)
4. \(\text{tan}^{-1}(13.33)\)
1. \(\text{tan}^{-1}(0.17)\)
2. \(\text{tan}^{-1}(9.46)\)
3. \(\text{tan}^{-1}(0.30)\)
4. \(\text{tan}^{-1}(13.33)\)
Subtopic: Ā Different Types of AC Circuits |
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A step-down transformer operates on \(2\) kV line. The ratio of the primary winding to the secondary winding is \(20:1\). Assuming \(100\%\) efficiency, the secondary voltage \(V_2\) is:
1. \(100~\text V\)
2. \(110~\text V\)
3. \(200~\text V\)
4. \(250~\text V\)
1. \(100~\text V\)
2. \(110~\text V\)
3. \(200~\text V\)
4. \(250~\text V\)
Subtopic: Ā Transformer |
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A \(100~\text{V},\) \(50~\text{Hz} \text-\) AC voltage source is connected across a \(2~\mu\text{F}\) capacitor. The current in the circuit is:
1. \(42\) mA
2. \(62.8\) mA
3. \(200\) mA
4. \(300\) mA
1. \(42\) mA
2. \(62.8\) mA
3. \(200\) mA
4. \(300\) mA
Subtopic: Ā Different Types of AC Circuits |
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