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

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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

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bSymmetric rectangular voltage across itself

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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

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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

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bThe capacitance voltage adds to the supply voltage

✖


c Both A. and B.

✓


dNone of these

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View Answer Both A. and B.

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


aSingle phase

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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

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bLine impedance stabilization network

✓


c Line integrated stored network

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dLaser integrated stabilization networking

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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

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View Answer 2 V m

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


a rectifier

✓


binverter

✖


cchopper

✖


dregulator

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View Answer rectifier

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