Electrical Engineering MCQs

Page No. 344

A MOSFET, for its conduction uses_____________?


aOnly minority carriers


bOnly majority carriers


cBoth minority and majority carriers


dNone of these



An RC snubber network used in BJT__________?


aDivert the collector current during turn – off


bImproves the reverse bias safe operating area


c Dissipates a fair amount of switching power


dAll of these


View Answer All of these

The ac output voltage waveform of VSI and AC output current waveform of CSI respectively is composed of___________?


a High dv / dt, low di / dt


bLow dv / dt, low di / dt


cLow dv / dt, high di / dt


dHigh dv / dt, high di / dt



If energy is taken from the AC side of the inverter and sends it back into the DC side, then it is known as___________?


a Motoring mode operation


b Braking mode operation


c Regenerative mode operation


dNone of these



A combination of synchronized leading edge and trailing edge modulation has also been used to control a____________?


a Boost single – phase power factor converter


b A buck dc – dc converter to reduce ripple in the intermediate dc bus capacitor


cBoth A. and B.


dNone f these


View Answer Both A. and B.

Regulator sampling PWM is usually used in___________?


a High power inverters


bRectifiers


cLow power inverters


dOnly A. and B.


View Answer Only A. and B.

In a 3 phase VSI SPWM to use a single carrier signal and preserve the features of PWM technique, the normalized carrier frequency should be____________?


aMultiple of two


bOdd multiple of three


cOdd multiple of five


d Odd multiple of seven


View Answer Odd multiple of three

In square wave operation mode of 3 phase VSI, the VSI


aCan control the load voltage


bCannot control the load voltage


cCannot control the load voltage except by means of dc link voltage


dCannot control the load voltage except by means of dc link current



For commutation in three phase PAC, normally balanced three phase voltages VR, VY and VB are connected to the three legs of the converter via______________?


a Three inductances


bThree capacitances


cThree resistance


d Three transistors


View Answer Three inductances

If all the SCR’s of 3 phase PAC is replaced by diodes, they would be triggered_____________?


a120 degree after the zero crossing of the corresponding line voltages


b60 degree after the zero crossing of the corresponding line voltages


c120 degree before the zero crossing of the corresponding line voltages


d 60 degree before the zero crossing of the corresponding line voltages



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