# 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%
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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%
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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?

2. 600 Hz

4. 500 Hz

Subtopic:  Different Types of AC Circuits |
70%
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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%
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