Electrical Engineering MCQs

Page No. 350

The man made noise sources is / are_____________?


aMotors

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bSwitches, radio interferences

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cComputers, digital electronics

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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

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cTriangular AC output voltage

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dTrapezoidal AC output voltage

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


a Noise

✓


b Distortion

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cInterference

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dAll of these

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View Answer Noise

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


a2nd

✓


b3rd

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c5th

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d7th

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View Answer 2nd

In commutation PAC stands for_______?


aPermanent angle converter

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bPhase angle converter

✓


cPhase angle commutation

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dPhase and commutation

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View Answer Phase angle converter

Double fourier series analysis of PWM is_____________?


aTwo dimensional functions

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bThree dimensional functions

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cOne dimensional functions

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dAll of these

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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

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bDC – DC

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cDC – AC

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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

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bSwitches between – 1 / 2 and + 1 / 2

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cSwitches between – 1 and + 1

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dSwitches between 0 and + 1

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


aOne

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btwo

✓


cThree

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dFour

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View Answer two

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


aDirectly proportional to their harmonic order

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bInversely proportional to their harmonic order

✓


cNot related to their harmonic order

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dNone of these

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