| 1. | Inductance affects the direct current flow ? | |
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only at the time of turning off
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only at the time of turning on
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at the time of turning on and off
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at all the time of operation
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Report Question| 2. | The product of apparent power and cosine of the phase angle between circuit voltage and current is ? | |
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true power
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reactive power
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volt-amperes
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instantaneous power
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| 3. | The purpose of a parallel circuit resonance is to magnify ? | |
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current
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voltage
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power
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frequency
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| 4. | In a pure resistive circuit ? | |
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current lags behind the voltage by 90º
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current leads the voltage by 90º
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current can lead or lag the voltage by 90°
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current is in phase with the voltage
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| 5. | Pure inductive circuit takes power from the A.C. line when ? | |
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applied voltage decreases but current increases
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applied voltage increases but current decreases
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both applied voltage and current increase
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both applied voltage and current decrease
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| 6. | The r.m.s. value and mean value is the same in the case of ? | |
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triangular wave
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sine wave
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square wave
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half wave rectified sine wave
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| 7. | When two waves are in phase they have peak values at an interval of ? | |
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180º
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120º
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90º
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none of the above
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| 8. | The power factor at resonance in R-L-C parallel circuit is ? | |
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zero
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0.08 lagging
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0.8 leading
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unity
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| 9. | Which of the following circuit component opposes the change in the circuit voltage ? | |
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Inductance
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Capacitance
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Conductance
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Resistance
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| 10. | Which of the following waves has the highest value of peak factor ? | |
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Square wave
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Sine wave
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Half wave rectified sine wave
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Triangular wave
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