Electrical Engineering MCQs

Page No. 346

The transfer function of PWM is generally developed in______________?


aTime domain


b Frequency domain


c Either A. or B.


dNone of these


View Answer Either A. or B.

DIAC and TRIAC both are semiconductors devices and conduct in____________________?


aDIAC conducts in forward direction and TRIAC conducts in reverse direction


bBoth conducts in forward direction


cBoth conducts in reverse direction


dBoth conducts in either direction



The Graetz bridge makes excellent use of ______________?


aCurrent transformer


bPotential transformer


c Power transformer


dSCR


View Answer Power transformer

In constant frequency PWM, at perturbation the amplitude of the sinusoidal component is a___________?


aLinear function


bNon linear function


c Constant function


dNone of these


View Answer None of these

If the firing angle becomes negative, then the rectifier begins to work as_______________?


aA rectifier


bAn inverter


cA chopper


d A regulator In constant frequency P


View Answer An inverter

In variable frequency, PWM gain


aPhase lead helps to increase the phase margin of the control loop


bPhase lag helps to increase the phase margin of the control loop


cPhase lead helps to decrease the phase margin of the control loop


dPhase lag helps to decrease the phase margin of the control loop



In a 3 phase half wave rectifier, when firing angle is less than 90 degree, then the average dc output voltage becomes__________________?


a Positive


bNegative


c Zero


dNone of these


View Answer Positive

Transformer utilization factor is a measure of the merit of a rectifier circuit. It is the ratio of_______________?


aAC input power to the transformer volt – amp rating required by secondary


bAC input power to the transformer volt – amp rating required by primary


cDC output power to the transformer volt – amp rating required by secondary


dDC output power to the transformer volt – amp rating required by primary



A carrier based PWM technique in CSI is composed of____________?


aA switching pulse generator and a shorting pulse generator


bA shorting pulse distributor


c A switching and shorting pulse combination


dAll of these


View Answer All of these

In a square – wave operation of 3 phase CSIs, the power values are on for___________?


a60 degree


b90 degree


c120 degree


d150 degree


View Answer 120 degree

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