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

Subtopic:  RMS & Average Values |
 84%
From NCERT
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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 

Subtopic:  Power factor |
 86%
From NCERT
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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

Subtopic:  Different Types of AC Circuits |
 70%
From NCERT
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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

Subtopic:  Power factor |
 74%
From NCERT
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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

Subtopic:  Power factor |
 55%
From NCERT
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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°

Subtopic:  Different Types of AC Circuits |
 83%
From NCERT
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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

Subtopic:  Different Types of AC Circuits |
 86%
From NCERT
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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.
Subtopic:  Different Types of AC Circuits |
 76%
From NCERT
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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. \(0.46~ \mathrm{W}\)
Subtopic:  Power factor |
From NCERT
NEET - 2016
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A step–down transformer transforms a supply line voltage of 2200 volt into 220 volt. The primary coil has 5000 turns. The efficiency and power transmitted by the transformer are 90% and 8 kilowatts respectively. How many turns are there in the secondary one?

1. 5000      2. 50       
3. 500          4. 5
Subtopic:  Transformer |
 81%
From NCERT
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