Electrical Engineering MCQs

Page No. 221

In a pure inductive circuit___________?


a the current is in phase with the voltage


b the current lags behind the voltage by 90°


cthe current leads the voltage by 90°


d the current can lead or lag by 90°



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


aunsymmetrical part of the wave form


b the quarter cycle


cthe half cycle


dthe whole cycle


View Answer the whole cycle

The transient currents are associated with the____________?


achanges in the stored energy in the inductors and capacitors


bimpedance of the circuit


capplied voltage to the circuit


d resistance of the circuit



In a pure resistive circuit__________?


acurrent lags behind the voltage by 90°


bcurrent leads the voltage by 90°


ccurrent can lead or lag the voltage by 90°


d current is in phase with the voltage



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


a C only


b L only


cR only


d all above


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


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


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


dnone of the above



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


afalls to 36.8% of its final steady value


brises to 38.6% of its final steady value


c rises to 63.2% of its final steady value


d none of the above



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


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


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


dnone of the above



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


aoscillating


bsquare wave


c sinusoidal


dnon-oscillating


View Answer sinusoidal

Power factor of the system is kept high__________?


ato reduce line losses


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


c to reduce voltage regulation of the line


d due to all above reasons



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