| 1. | Time constant of a capacitive circuit increases with the ? | |
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increase of capacitance and decrease of resistance
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increase of capacitance and increase of resistance
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decrease of capacitance and decrease of resistance
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decrease of capacitance and increase of resistance
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Report Question| 2. | For a sine wave with peak value Imax the r.m.s. value is ? | |
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0.5 Imax
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0.707 Imax
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0.9 Imax
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1.414 Imax
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| 3. | The form factor is the ratio of ? | |
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peak value to r.m.s. value
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r.m.s. value to average value
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average value to r.m.s. value
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none of the above
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| 4. | At ...... frequencies the parallel R-L circuit behaves as purely resistive ? | |
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low
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very low
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high
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very high
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| 5. | To neglect a current source, the terminals across the source are ? | |
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replaced by source resistance
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replaced by capacitance
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short-circuited
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open-circuited
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| 6. | In a pure inductive circuit ? | |
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the current is in phase with the voltage
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the current lags behind the voltage by 90º
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the current leads the voltage by 90º
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the current can lead or lag by 90º
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| 7. | The ratio of the bandwidth to the resonance frequency is called the ...... of the circuit ? | |
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impedance
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susceptance
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quality factor
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selectivity
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| 8. | A phaser is ? | |
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a line which represents the magnitude and phase of an alternating quantity
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a line representing the magnitude and direction of an alternating quantity
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a coloured tag or band for distinction between. different phases of a 3°-phase supply
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an instrument used for measuring phases of an unbalanced B-phase load
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| 9. | Power factor of the system is kept high ? | |
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to reduce line losses
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to maximise the utilization of the capacities of generators, lines and transformers
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to reduce voltage regulation of the line
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due to all above reasons
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| 10. | ln a three-phase supply floating neutral is undesirable because it way give rise to ? | |
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high voltage across the load
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low voltage across the load
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unequal line voltages across the load
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all of the above
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