Electrical Engineering MCQs

Page No. 349

n a phase controlled 3 phase ac voltage controller, the harmonic present is__________?


a 2nd


b3rd


c5th


d7th


View Answer 2nd

The power MOSFET device is a___________?


aCurrent controlled unipolar device


bVoltage controlled unipolar device


cCurrent controlled bipolar device


dVoltage controlled bipolar device



In dual converters________________?


aBoth rectifiers provides positive current to the load


bBoth rectifiers provide negative current to the load


cOne rectifiers provide positive current to the load and the other negative current


dOne rectifier provide positive current to the source and the other negative current to the load



The conduction losses in IGBT is____________?


aMore than that of MOSFET


bLower than that of MOSFET


cEqual to that of MOSFET


dEqual to that of BJT



For a buck converter to reduce the conduction losses in diode


aA high on – resistance switch can be added in parallel


bA low on – resistance switch can be added in parallel


cA high on – resistance switch can be added in series


dA low on – resistance switch can be added in series



Advantages of HVDC transmission over AC system is / are____________?


aReversal of power can be controlled by firing angle


bVery good dynamic behavior


cThey can link two AC system operating unsynchronized


dAll of these


View Answer All of these

For bidirectional operation of converters____________?


aA parallel combination of controllable switch and a diode is used


bA parallel combination of controllable switch and capacitor is used


c A series combination of controllable switch and a diode is used


dA series combination of controllable switch and a capacitor is used



In rectifiers, load current flow is_________?


aUnidirectional


bBidirectional


cEither (a) or (b)


dNon directional


View Answer Unidirectional

Due to non sinusoidal waveform of the input current, the power factor of the rectifier is____________?


a Negatively affected by firing angle


bNegatively affected by distortion of the input current


cPositively affected by both firing angle and distortion of the input current


dBoth (a) and (b)


View Answer Both (a) and (b)

Single phase VSI are mainly used in___________?


aPower supplies


bUps


cMultilevel configuration


dAll of these


View Answer All of these

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