A generator produces a voltage that is given by V = 240 sin 120 t, where t is in seconds. The frequency and r.m.s. voltage are:
1. | 60 Hz and 240 V |
2. | 19 Hz and 120 V |
3. | 19 Hz and 170 V |
4. | 754 Hz and 70 V |
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In an ac circuit, the current is given by \(i=5\sin(100t-\frac{\pi}{2})\) and the ac potential is V = 200 sin(100t) volt. The power consumption is:
1. 20 W
2. 40 W
3. 1000 W
4. 0
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In an LCR circuit having L = 8.0 henry, C = 0.5 μF and R = 100 ohm in series, what is the resonance frequency?
1. 600 radian/sec
2. 600 Hz
3. 500 radian/sec
4. 500 Hz
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A circuit consists of 3 ohms of resistance and 4 ohms of reactance. The power factor of the circuit is:
1. 0.4
2. 0.6
3. 0.8
4. 1.0
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The power factor of a good choke coil is:
1. Nearly zero
2. Exactly zero
3. Nearly one
4. Exactly one
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In a series LCR circuit, resistance \(R=10~\Omega\) and the impedance \(Z=20~\Omega\). The phase difference between the current and the voltage will be:
1. 30°
2. 45°
3. 60°
4. 90°
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In the circuit shown in the figure, neglecting source resistance, the voltmeter and ammeter reading respectively will be:
1. 0 V, 3 A
2. 150 V, 3 A
3. 150 V, 6 A
4. 0 V, 8 A
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An ac source of variable frequency f is connected to an LCR series circuit. Which of the following graphs represents the variation of the current I in the circuit with frequency f?
1. | 2. | ||
3. | 4. |
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An inductor of \(20~\mathrm{mH},\) a capacitor of \(50~ \mu F,\) and a resistor of \(40~ \Omega\) are connected in series across a source of emf of \(V=10sin(340t).\) What will be the power loss in the AC circuit?
1. | \(0.67~ \mathrm{W}\) | 2. | \(0.78~ \mathrm{W}\) |
3. | \(0.89~ \mathrm{W}\) | 4. | \(0.46~ \mathrm{W}\) |
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The natural frequency of the circuit shown in the figure is:
1.
2.
3.
4. None of these