Electrical Engineering MCQs

Page No. 348

An ideal diode is___________?


aUnidirectional

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bBidirectional

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cFixed voltage polarity

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dOnly (a) and (c)

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View Answer Only (a) and (c)

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


aSine wave

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bSquare wave

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cSaw – tooth wave

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dTrapezoidal wave

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View Answer Square wave

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


a Uninterruptible power supplies

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bInduction heating system

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cConstant voltage and frequency power supplies

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d All of these

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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

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

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

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

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


aCurrent sensor across IGBT

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bVoltage sensor across IGBT

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cCurrent sensor in series with IGBT

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d Voltage sensor in series with IGBT

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Harmonics in 3 phase inverters can be reduced by using___________?


aPassive filter

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bActive filter

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c Both passive and active filters

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dNone of these

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The on – state voltage drop of IGBT consists of__________?


aDrop across the collector junction

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bDrop across the drift region

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cDrop across MOSFET portion

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dAll of these

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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

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bLarge isolating pulse transformer

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cA train of pulses

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d None of these

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View Answer A train of pulses

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


a180 degree

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b190 degree

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c200 degree

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d210 degree

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View Answer 210 degree

With increase in firing angle,


aBoth harmonic distortion and quality of input current increases

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bHarmonic distortion increases and quality of input current decreases

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cHarmonic distortion decreases and quality of input current increases

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dBoth harmonic distortion and quality of input current decreases

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