Electrical Engineering MCQs

Page No. 346

The transfer function of PWM is generally developed in______________?


aTime domain

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b Frequency domain

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c Either A. or B.

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dNone of these

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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

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bBoth conducts in forward direction

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cBoth conducts in reverse direction

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dBoth conducts in either direction

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The Graetz bridge makes excellent use of ______________?


aCurrent transformer

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bPotential transformer

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c Power transformer

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dSCR

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View Answer Power transformer

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


aLinear function

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bNon linear function

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c Constant function

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dNone of these

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View Answer None of these

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


aA rectifier

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bAn inverter

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cA chopper

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d A regulator In constant frequency P

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View Answer An inverter

In variable frequency, PWM gain


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

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

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

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

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


a Positive

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bNegative

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c Zero

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dNone of these

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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

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

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

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

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A carrier based PWM technique in CSI is composed of____________?


aA switching pulse generator and a shorting pulse generator

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bA shorting pulse distributor

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c A switching and shorting pulse combination

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dAll of these

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View Answer All of these

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


a60 degree

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b90 degree

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c120 degree

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d150 degree

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View Answer 120 degree

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