Electrical Engineering MCQs

Page No. 223

Capacitors for power factor correction are rated in_________?


akW


bkVA


ckV


d kVAR


View Answer kVAR

The r.m.s. value of a sinusoidal A.C. current is equal to its value at an angle of_______degrees?


a90


b60


c 45


d30


View Answer 45

Form Factor is the ratio of__________?


aaverage value/r.m.s. value


b average value/peak value


c r.m.s. value/average value


d r.m.s. value/peak value



For a sine wave with peak value Emax _______ 8.30. the average value is?


a0.636 Emax


b0.707 Emax


c0.434 EWc


d lAUEmax


View Answer 0.636 Emax

For a sine wave with peak value Imax the r.m.s. value is_______?


a0.5 Imax


b0.707


c 0.9


d1.414 Lmax


View Answer 0.707

Form factor for a sine wave is________?


a1.414


b0.707


c 1.11


d0.637


View Answer 1.11

The r.m.s. value and mean value is the same in the case of___________?


atriangular wave


bsine wave


c square wave


dhalf wave rectified sine wave


View Answer square wave

For the same peak value, which of the following wave has the least mean value ?


ahalf wave rectified sine wave


btriangular wave


csine wave


d square wave



The power consumed in a circuit element will be least when the phase difference between the current and voltage is________?


a180″


b90°


c60°


d


View Answer 90°

Two waves of the same frequency have opposite phase when the phase angle between them is_________?


a360°


b180°


c90°


d


View Answer 180°

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