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Power Electronics

Power Electronics
Figure shows two thyristors rated 400 A sharing a load current. Current through T2 is 180A. Current through T1 will be

  150 A.
 100 A.
 110 A.
 120 A.

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Power Electronics
Light triggering mainly used in

 medium voltage direct current transmission.
 low - voltage direct current transmission.
  high voltage direct current transmission.
  all of these.

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Power Electronics
Which statement is true for latching current ?

 Both C and D.
 It is related to conduction process of device.
  It is related to turn on process of the device.
 It is related to turn off process of the device.

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Power Electronics
By which one of the following we can measure the reliability of a string?

 Factor of safety.
 String efficient.
 Reliability factor.
  Derating factor.

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Power Electronics
After proper turn on of thyristor

  gate signal must be removed.
None of these
 gate signal is always present.
 gate signal should present but can be removed.

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Power Electronics
Which one is most suitable power device for high frequency (>100 KHz) switching application?

 Microwave transistor.
  Power MOSFET.
 Schottky diode.
 BJT.

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