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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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAn 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 & BiologyThe peak value of an alternating e.m.f. is 10 volt and its frequency is 50 Hz. At a time \(t=\frac{1}{600}~s,\) the instantaneous value of the e.m.f. will be:
1. 1 volt
2. volt
3. 5 volt
4. 10 volt
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe variation of the instantaneous current (I) and the instantaneous emf (E) in a circuit are shown in the figure. Which of the following statements is correct?
1. The voltage lags behind the current by π/2.
2. The voltage leads the current by π/2.
3. The voltage and the current are in phase.
4. The voltage leads the current by π.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhen an alternating voltage is given as \(E = (6 sin\omega t - 2 cos \omega t)\) volt, what is its RMS value?
1. \(4 \sqrt 2 \) V
2. \(2 \sqrt 5\) V
3. \(2 \sqrt 3\) V
4. \(4\) V
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe time required for a 50 Hz sinusoidal alternating current to change its value from zero to the r.m.s. value will be:
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe r.m.s. value of the potential difference V shown in the figure is:
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyVoltage and current in an ac circuit are given by \(V=5sin\left ( 100\pi t-\frac{\pi }{6}~ \right )~V\) and \(I=4sin\left ( 100\pi t+\frac{\pi }{6}~ \right )~A.\)
Hence:
1. the voltage leads the current by 30
2. the current leads the voltage by 30
3. the current leads the voltage by 60
4. the voltage leads the current by 60
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe output current versus time curve of a rectifier is shown in the figure.
The average value of the output current in this case will be:
1. 0
2.
3.
4. I0
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn an ac circuit I= 100 sin 200 t. The time required for the current to reach its peak value will be:
1. \(\frac{1}{100}~sec\)
2. \(\frac{1}{200}~sec\)
3. \(\frac{1}{300}~sec\)
4. \(\frac{1}{400}~sec\)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology