An alternating current is given as i = i1 cos ωt - i2 sin ωt. The value of rms current is given by:
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn a step-up transformer, the turn ratio is 1:2 . A Leclanche cell (e.m.f. 1.5 V) is connected across the primary coil. What would be the voltage developed in the secondary coil?
1. 3.0 V
2. 0.75 V
3. 1.5 V
4. Zero
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA 220 V, 50 Hz ac source is connected to an inductance of 0.2 H and a resistance of 20 ohms in series. How much current flows across the circuit?
1. 10 A
2. 5 A
3. 33.3 A
4. 3.33 A
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhen a step-down transformer is connected to a 2400 volt line, the output load receives 80 amps of current. The ratio of the turns in the primary and secondary coils is 20:1. If transformer efficiency is 100%, then the current flowing in the primary coil will be:
1. 1600 A
2. 20 A
3. 4 A
4. 1.5 A
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA 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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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn an ac circuit, the current is given by 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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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn 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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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA 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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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe power factor of a good choke coil is:
1. Nearly zero
2. Exactly zero
3. Nearly one
4. Exactly one
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn a series LCR circuit, resistance R = 10 Ω and the impedance Z = 20 Ω. The phase difference between the current and the voltage will be:
1. 30°
2. 45°
3. 60°
4. 90°
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology