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Q. No.An alternating current (AC) flowing in a circuit cannot be measured by a DC-ammeter because:
1.
The average value of the current over a complete cycle is zero.
2.
AC does not change its direction after a fixed time interval.
3.
AC can damage the ammeter.
4.
AC is more dangerous than DC.
Subtopic: Ā RMS & Average Values |
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Level 1: 80%+
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A transformer has an efficiency of \(80\text{%}.\) It works at \(40\) kW and \(100\) V. If the secondary voltage is \(240\) V, the current in the secondary coil is nearly:
1. \(40\) A
2. \(133.3\) A
3. \(86.7\) A
4. \(112\) A
1. \(40\) A
2. \(133.3\) A
3. \(86.7\) A
4. \(112\) A
Subtopic: Ā Transformer |
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Level 1: 80%+
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A resistor of resistance \(R\) is connected in series with an inductor of inductance \(L\) in an AC circuit. If the phase difference between the applied voltage and the current is \(45^{\circ}, \) the inductive reactance \(X_L\)ā€‹ is:
| 1. | \(R\) | 2. | \(\dfrac{R}{2}\) |
| 3. | \(\dfrac{3R}{2}\) | 4. | \(\dfrac{R}{\sqrt2}\) |
Subtopic: Ā Different Types of AC Circuits |
Ā 72%
Level 2: 60%+
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In which of the following circuits, maximum power dissipation is observed?
1. Pure resistive circuit
2. Pure capacitive circuit
3. Pure inductive circuit
4. None of the above
1. Pure resistive circuit
2. Pure capacitive circuit
3. Pure inductive circuit
4. None of the above
Subtopic: Ā Power factor |
Ā 88%
Level 1: 80%+
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In an \(LCR\) series circuit connected to an AC voltage source, which option shows the correct voltage across the resistor and the current in the circuit, based on the given values of resistance \((R),\) inductive reactance \((X_L),\) and capacitive reactance \((X_C)?\)
| 1. | \(100~\text{V}; ~5~\text{A}\) | 2. | \(200~\text{V}; ~4~\text{A}\) |
| 3. | \(100~\text{V}; ~2~\text{A}\) | 4. | \(100\sqrt{2}~\text{V}; ~2\sqrt{2}~\text{A}\) |
Subtopic: Ā Different Types of AC Circuits |
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An ideal transformer has \(100\) turns in the primary coil and carries a \(5\) A current. To achieve a \(1600\) V output with a \(2\) kW power output, the number of turns in the secondary coil must be:
1. \(100\)
2. \(200\)
3. \(300\)
4. \(400\)
1. \(100\)
2. \(200\)
3. \(300\)
4. \(400\)
Subtopic: Ā Transformer |
Ā 84%
Level 1: 80%+
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An alternating voltage \(V=V_0\sin(\omega t)\) is applied across a circuit. As a result, a current \(I=I_0\sin\Big(\omega t+\dfrac{\pi}{2}\Big)\) flows in it. The power consumed per cycle is:
| 1. | \(\dfrac{V_0I_0}{2}\) | 2. | \(\dfrac{V_0I_0}{\sqrt2}\) |
| 3. | \(\sqrt2V_0I_0\) | 4. | zero |
Subtopic: Ā Power factor |
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Level 2: 60%+
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Transformers are used properly in:
1. DC circuit only
2. AC circuit only
3. both DC and AC circuits
4. integrated circuit
1. DC circuit only
2. AC circuit only
3. both DC and AC circuits
4. integrated circuit
Subtopic: Ā Transformer |
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In the circuit depicted below, what will be the voltmeter and ammeter readings?
1. \(800\) V, \(2\) A
2. \(300\) V, \(2\) A
3. \(220\) V, \(2.2\) A
4. \(100\) V, \(2\) A
1. \(800\) V, \(2\) A
2. \(300\) V, \(2\) A
3. \(220\) V, \(2.2\) A
4. \(100\) V, \(2\) A
Subtopic: Ā Different Types of AC Circuits |
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In the given figure, a series \(LCR\) circuit is shown with the following parameters:
\(V_0=200~ \text{volts}, ~\omega=100~\text{rad/s},\) \(X_L=100~\Omega,\)
\(X_C=100~\Omega~\text{and}~R=100~\Omega.\)
(symbols have their usual meanings)
1. \(1~\text{A}\)
2. \(2~\text{A}\)
3. \(3~\text{A}\)
4. \(4~\text{A}\)
Subtopic: Ā Different Types of AC Circuits |
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