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Power Electronics

Power Electronics
Under over voltage condition impedance offered by the voltage clamping device is

 moderate.
 high.
 infinity.
  low.

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Power Electronics
What happen due to high di / dt?

 None of these.
  Local hot spot.
 Insulation failure.
 Breakdown of junction.

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Power Electronics
Practical way of obtaining static voltage equalization in series connected SCRs is by the use of

 resistors of different values across each SCR.
 one resistor across the string.
  resistors of the same value across each SCR.
 one resistor in series with each SCR.

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Power Electronics
Power transistor are type of

 MOSFETs.
 IGBTs.
 BJTs.
  All of above.

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Power Electronics
SCRs are used in series to meet

 low voltage demand.
 low current demand.
 high current demand.
  high voltage demand.

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Power Electronics
During which time maximum conduction spreading take place in the thyristor during turn ON?

 Rise time.
  Spread time.
 Delay time.
 Same for every case.

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