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

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bVoltage controlled unipolar device

✓


cCurrent controlled bipolar device

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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

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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

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bLower than that of MOSFET

✓


cEqual to that of MOSFET

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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

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bA low on – resistance switch can be added in parallel

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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

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cThey can link two AC system operating unsynchronized

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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

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

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dA series combination of controllable switch and a capacitor is used

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In rectifiers, load current flow is_________?


aUnidirectional

✓


bBidirectional

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cEither (a) or (b)

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dNon directional

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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

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bNegatively affected by distortion of the input current

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

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dBoth (a) and (b)

✓


View Answer Both (a) and (b)

Single phase VSI are mainly used in___________?


aPower supplies

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bUps

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cMultilevel configuration

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dAll of these

✓


View Answer All of these

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