Electrical Engineering MCQs

Page No. 353

Voltage commutation circuit can be converted into a current commutation by interchanging the positions of____________?


aDiode and capacitor


bCapacitor and SCR


cInductor and capacitor


dCapacitor and load


View Answer Diode and capacitor

In a 3 phase bridge rectifier the ripple frequency is _____________?


aEqual to the input frequency


bTwice the input frequency


cThree times the input frequency


dSix times the input frequency



In a load commutated DC – DC chopper, the capacitor has a_____________?


aSymmetric triangular voltage across itself


bSymmetric rectangular voltage across itself


cSymmetric trapezoidal voltage across itself


dSymmetric sinusoidal voltage across itself



The sum of all phase current in a star connected primary winding with no neutral connection is equal to___________?


aPhase current


bThree times the phase current


cThree times the line current


dZero at all times


View Answer Zero at all times

In current commutated DC-DC choppers, the voltage spike appears across the load when_____________?


aVoltage across the commutating inductances collapses


bThe capacitance voltage adds to the supply voltage


c Both A. and B.


dNone of these


View Answer Both A. and B.

For power output higher than 15 kW, the suitable rectifier is________________?


aSingle phase


b3 phase


cPoly phase


d Only (b) and (c)


View Answer Only (b) and (c)

In a full wave rectifier, the rectification ratio is approximately equal to____________?


a61%


b71%


c81%


d91%


View Answer 81%

LISN is a device used to measure conducted emissions. LISN stands for_____________?


aLine integrated stabilization network


bLine impedance stabilization network


c Line integrated stored network


dLaser integrated stabilization networking



In a single phase full wave rectifier, during blocking state the pea inverse voltage of diode is______________?


aV m


b 2 V m


cV m / 2


d4 V m


View Answer 2 V m

A single phase ac – dc converter is also known as____________?


a rectifier


binverter


cchopper


dregulator


View Answer rectifier

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