Electrical Engineering MCQs

Page No. 348

An ideal diode is___________?


aUnidirectional


bBidirectional


cFixed voltage polarity


dOnly (a) and (c)


View Answer Only (a) and (c)

The input current waveform of a bridge controlled rectifier when the load is perfectly filtered is___________?


aSine wave


bSquare wave


cSaw – tooth wave


dTrapezoidal wave


View Answer Square wave

The IGBT resulted in higher switching speed and lower energy losses. It can be used for___________?


a Uninterruptible power supplies


bInduction heating system


cConstant voltage and frequency power supplies


d All of these


View Answer All of these

The advantage of using free – wheeling diode in half controlled bridge converter is that


aThere is always a path for the dc current independent of the ac line


bThere is always a path for the ac current independent of the ac line


c There is always a path for the dc current dependent of the ac line


dThere is always a path for the ac current independent of the ac line



To detect an over – current fault condition, the most reliable method is to connect a_____________?


aCurrent sensor across IGBT


bVoltage sensor across IGBT


cCurrent sensor in series with IGBT


d Voltage sensor in series with IGBT



Harmonics in 3 phase inverters can be reduced by using___________?


aPassive filter


bActive filter


c Both passive and active filters


dNone of these



The on – state voltage drop of IGBT consists of__________?


aDrop across the collector junction


bDrop across the drift region


cDrop across MOSFET portion


dAll of these


View Answer All of these

The most suited gate pulses given to the AC regulator with R – L load can be in the form of____________?


a Continuous signal


bLarge isolating pulse transformer


cA train of pulses


d None of these


View Answer A train of pulses

The maximum firing angle in the half wave controlled regulator is_____________?


a180 degree


b190 degree


c200 degree


d210 degree


View Answer 210 degree

With increase in firing angle,


aBoth harmonic distortion and quality of input current increases


bHarmonic distortion increases and quality of input current decreases


cHarmonic distortion decreases and quality of input current increases


dBoth harmonic distortion and quality of input current decreases



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