Electrical Engineering MCQs

Page No. 350

The man made noise sources is / are_____________?


aMotors


bSwitches, radio interferences


cComputers, digital electronics


dAll of these


View Answer All of these

Very large values of modulation index (greater than 3.24) lead to___________?


aSquare AC output voltage


bSine AC output voltage


cTriangular AC output voltage


dTrapezoidal AC output voltage



Any electrical signal present in a circuit other than the desired signal is known as______________?


a Noise


b Distortion


cInterference


dAll of these


View Answer Noise

In single phase VSI, the harmonic which is not present is____________?


a2nd


b3rd


c5th


d7th


View Answer 2nd

In commutation PAC stands for_______?


aPermanent angle converter


bPhase angle converter


cPhase angle commutation


dPhase and commutation


View Answer Phase angle converter

Double fourier series analysis of PWM is_____________?


aTwo dimensional functions


bThree dimensional functions


cOne dimensional functions


dAll of these



In the operation and control of both naturally commutated and forced commutated SCR base converter, commutation plays an important role. The converters is / are ___________?


a AC – DC


bDC – DC


cDC – AC


dAll of these


View Answer All of these

In bipolar modulation, the carrier is symmetric about zero with amplitude equal to Cm, the PWM output


aZero


bSwitches between – 1 / 2 and + 1 / 2


cSwitches between – 1 and + 1


dSwitches between 0 and + 1



In a 3 phase VSI out of eight valid states, the number of valid states that produce zero ac line voltages is/are_________?


aOne


btwo


cThree


dFour


View Answer two

The square wave operation of 3 phase VSI lines contains the harmonics. The amplitudes are____________?


aDirectly proportional to their harmonic order


bInversely proportional to their harmonic order


cNot related to their harmonic order


dNone of these



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