Electrical Engineering MCQs

Page No. 351

In a three phase voltage source inverters____________?


aOnly amplitude of voltage is controllable


bOnly phase is controllable


cBoth amplitude and phase is controllable


dAmplitude, phase and frequency of voltages should always be controllable



Under harmonic free load voltages, the 3 phase VSI_____________?


aDoes not contains second harmonic


bDoes not contains third harmonic


cDoes not contains fifth harmonic


dDoes not contains seventh harmonic



Double edge modulation eliminates certain harmonics when the reference is a__________?


aSine wave


bSquare wave


cTriangular wave


dTrapezoidal wave


View Answer Sine wave

For similar carrier and modulating signals, the line current used in CSI is__________?


a Identical to line voltage in a VSI


b Identical to line current in VSI


cIdentical to phase voltage in VSI


dIdentical to phase voltage in CSI



The carrier which are commonly used in constant – frequency PWM is______________?


aSawtooth carrier


b Inverted sawtooth carrier


cTriangle carrier


dAll of these


View Answer All of these

In a 3 phase CSI, if the required line output voltages are balanced and 120 degree out of phase, then the chopping angles are used to eliminate only the harmonics at frequencies


a5


b7


c11


dAll of these


View Answer All of these

A capacitive load in voltage source inverters generates ________________?


aSmall current spikes and can be reduced by using an inductive filter


b Large current spikes and can be increased by using an inductive filter


c Small current spikes and can be increased by using an inductive filter


d Small current spikes and can be increased by using an inductive filter



In a three phase converter, the number of notches per cycle is____________?


aOne


bThree


cSix


dNine


View Answer Six

The main objective of static power converters is to____________?


aObtain an dc output waveform from a dc power supply


bObtain an ac output waveform from a dc power supply


cObtain an dc output waveform from a dc power supply


dObtain an ac output waveform from a ac power suppl



The control method used for PWM dc – dc converter is______________?


aVoltage mode control


bCurrent mode control


cHysteric control


dAll of these


View Answer All of these

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