Electrical Engineering MCQs

Page No. 221

In a pure inductive circuit___________?


a the current is in phase with the voltage

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b the current lags behind the voltage by 90°

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cthe current leads the voltage by 90°

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d the current can lead or lag by 90°

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In the case of an unsymmetrical alternating current the average value must always be taken over__________?


aunsymmetrical part of the wave form

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b the quarter cycle

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cthe half cycle

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dthe whole cycle

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View Answer the whole cycle

The transient currents are associated with the____________?


achanges in the stored energy in the inductors and capacitors

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bimpedance of the circuit

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capplied voltage to the circuit

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d resistance of the circuit

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In a pure resistive circuit__________?


acurrent lags behind the voltage by 90°

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bcurrent leads the voltage by 90°

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ccurrent can lead or lag the voltage by 90°

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d current is in phase with the voltage

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In a circuit containing R, L and C, power loss can take place in____________?


a C only

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b L only

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cR only

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d all above

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View Answer R only

The r.m.s. value of alternating current is given by steady (D.C.) current which when flowing through a given circuit for a given time produces__________?


athe more heat than produced by A.C. when flowing through the same circuit

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b the same heat as produced by A.C. when flowing through the same circuit

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c the less heat than produced by A.C. flowing through the same circuit

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dnone of the above

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The time constant of the capacitance circuit is defined as the time during which voltage________?


afalls to 36.8% of its final steady value

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brises to 38.6% of its final steady value

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c rises to 63.2% of its final steady value

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d none of the above

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The square waveform of current has following relation between r.m.s. value and average value?


ar.m.s. value is equal to average value

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b r.m.s. value of current is greater than average value

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cr.m.s. value of current is less than average value

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dnone of the above

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In a loss-free R-L-C circuit the transient current is__________?


aoscillating

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bsquare wave

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c sinusoidal

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dnon-oscillating

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View Answer sinusoidal

Power factor of the system is kept high__________?


ato reduce line losses

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bto maximise the utilization of the capacities of generators, lines and transformers

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c to reduce voltage regulation of the line

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d due to all above reasons

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