| 1. | The r.m.s. value of a sine wave is 100A. Its peak value is ? | |
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70.7 A
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141.4A
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150 A
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282.8 A
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Report Question| 2. | Which of the following coil will have large resonant frequency ? | |
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A coil with large resistance
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A coil with low resistance
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A coil with large distributed capacitance
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A coil with low distributed capacitance
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| 3. | In a R-L-C circuit ? | |
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power is consumed in resistance and is equal to I²R
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exchange of power takes place between inductor and supply line
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exchange of power takes place between capacitor and supply line
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all above are correct
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| 4. | The power consumed in a circuit element will be least when the phase difference between the current and voltage is ? | |
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180º
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90º
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60º
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0º
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| 5. | In series resonant circuit, increasing inductance to its twice value and reducing capacitance to its half value ? | |
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will change the maximum value of current at resonance
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will change the resonance frequency
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will change the impedance at resonance frequency
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will increase the selectivity of the circuit
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| 6. | Power factor of an inductive circuit is usually improved by connecting capacitor to it in ? | |
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parallel
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series
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either (a) or (b)
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none of the above
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| 7. | For a sine wave with peak value Emax the average value is ? | |
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0.636 Emax
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0.707 Emax
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0.434 Emax
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1.414 Emax
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| 8. | A sine wave has a frequency of 60 Hz. Its angular frequency is ...... radian/second ? | |
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100 ?
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50 ?
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25 ?
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5 ?
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| 9. | Skin effect occurs when a conductor carries current at ...... frequencies ? | |
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very low
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low
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medium
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high
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| 10. | The negative maximum of a cosine wave occurs at ? | |
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30º
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45°
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90º
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180º
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