Electrical Engineering MCQs

Page No. 345

The ability of an electronic system to function properly in its intended electromagnetic environment and should not be a source of pollution to that electromagnetic environment is known as____________?


a Susceptibility


bEmission


cInterference


dElectromagnetic compatibility



The opposite of susceptibility is___________?


aImmunity


bEmission


cInterference


dElectromagnetic compatibility


View Answer Immunity

The output current in PWM DC – DC converters is equal to___________?


aAverage value of the output inductor current


b Product of an average inductor current and a function of duty ratio


c Either A. or B.


d None of these


View Answer Either A. or B.

A step – down choppers can be used in___________?


aElectric traction


bElectric vehicles


cMachine tools


dAll of these


View Answer All of these

In a lossless inverter, the average power absorbed in one period by the load must be__________?


a Equal to the average power supplied by the dc source


bGreater than the average power supplied by the dc source


cLesser than the average power supplied by the dc source


dEqual to the average power supplied by the ac source



The ac voltage controller can be used for ___________?


a Lighting and heating control


b On – line transformer tap changing


cSoft starting


dAll of these


View Answer All of these

In a full bridge VSI, in order to avoid the short circuit across the DC bus and the undefined AC output voltage condition, the modulating technique should ensure that___________?


aTop switch of each leg is on at any instant


bBottom switch of each leg is on at any instant


cEither A. or B.


dNone of these


View Answer Either A. or B.

The phase angle of gate signal in TRIAC can be shifted by using_____________?


aA capacitor


b A variable resistor


cAn inductor


dOnly (a) and (b)


View Answer Only (a) and (b)

In the SPWM, the modulating signal is___________?


aSquare


bSinusoidal


cTriangular


d Saw – tooth


View Answer Sinusoidal

A TRIAC can be turned on with______________?


a Positive voltage at the gate terminal


b Negative voltage at the gate terminal


cEither (a) or (b)


dNone of these


View Answer Either (a) or (b)

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