Combined synchronised leading edge and trailing edge modulation has been used to control which converters?
Correct answer C. Both A and B
Subject / 245 questions
Electrical Engineering MCQs
Page 2 of Electrical Engineering multiple-choice questions with answers. Tap an option to check yourself.
Page 2 of 13
Where is regular sampling PWM usually used?
Correct answer D. Only A and B
In a three-phase VSI using SPWM with a single carrier, what should the normalised carrier frequency be to preserve the features of the PWM technique?
Correct answer D. Odd multiple of three
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In square wave operation of a three-phase VSI, how is the load voltage controlled?
Correct answer C. Cannot control the load voltage except by means of dc link voltage
For commutation in a three-phase PAC, through which components are the balanced three-phase voltages VR, VY and VB normally connected to the converter legs?
Correct answer B. Three inductances
If all the SCRs of a three-phase PAC are replaced by diodes, when would they be triggered?
Correct answer C. 60 degrees after the zero crossing of the corresponding line voltages
What is the ability of an electronic system to work properly in its intended electromagnetic environment without polluting that environment called?
Correct answer C. Electromagnetic compatibility
What is the opposite of susceptibility in EMC terms?
Correct answer B. Immunity
In PWM DC–DC converters, what is the output current equal to?
Correct answer C. Either A or B
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Where can step-down choppers be used?
Correct answer D. All of these
In a lossless inverter, what must the average power absorbed by the load over one period be?
Correct answer D. Equal to the average power supplied by the dc source
What can an AC voltage controller be used for?
Correct answer D. All of these
In a full bridge VSI, to avoid short circuiting the DC bus and to keep the AC output voltage defined, what must the modulation technique ensure?
Correct answer C. Either A or B
Which components can be used to shift the phase angle of a TRIAC’s gate signal?
Correct answer D. Only A and B
In SPWM, what is the shape of the modulating signal?
Correct answer A. Sinusoidal
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How can a TRIAC be triggered into conduction?
Correct answer C. Either A or B
In which domain is the transfer function of PWM generally developed?
Correct answer C. Either A or B
In which direction do DIACs and TRIACs conduct?
Correct answer C. Both conduct in either direction
The Graetz bridge makes excellent use of which component?
Correct answer A. Power transformer
In constant frequency PWM, when a perturbation is applied, what kind of function is the amplitude of the sinusoidal component?
Correct answer D. None of these