Electrical Engineering MCQs

Page No. 219

At very low frequencies a series R-C circuit behaves as almost purely___________?


aresistive


binductive


ccapacitive


dnone of the above


View Answer capacitive

The frequency of domestic power supply in Pakistan is_________?


a200 Hz


b100 Hz


c60 Hz


d 50 Hz


View Answer 50 Hz

In a three-phase supply floating neutral is undesirable because it way give rise to___________?


ahigh voltage across the load


b low voltage across the load


cunequal line voltages across the load


dminimun voltage across the load



The r.m.s. value of half wave rectified sine wave is 200 V. The r.m.s. value of full wave rectified AC. will be___________?


a282.8 V


b141.4 V


c111 V


d100 V


View Answer 282.8 V

Which of the following waves has the highest value of peak factor ___________?


aSquare wave


bSine wave


cHalf wave rectified sine wave


dTriangular wave



The inductance of a coil can be increased by_________?


a increasing core length


b decreasing the number of turns


cdecreasing the diameter of the former


dchoosing core material having high relative permeability



The phosphors for which of the following pair are 180° out of phase for VL, VC and VR______?


aVc and VR


b VL and VR


c Vc and VL


dnone of the above


View Answer Vc and VL

The r.m.s. value of pure cosine function is_________?


a0.5 of peak value


b 0.707 of peak value


csame as peak value


dzero



The series and parallel resonance on L-C circuit’ differs in that_________?


aseries resistance needs a low-resistance source for sharp rise in current


bseries resonance needs a high-resistance source for sharp increase in current


cparallel resonance needs a low-resistance source for a sharp in¬crease in impedance


dparallel resonance needs a low-resistance source for a sharp rise in line current



The frequency of an alternating current is____________?


athe speed with which the alternator runs


b the number of cycles generated in one minute


c the number of waves passing through a point in one second


dthe number of electrons passing through a point in one second



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