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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.
 120 A.
 110 A.
 100 A.

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Power Electronics
For series connected SCR’s dynamic equalising circuit consists of

 series R and diode with C across R.
  R and C in series but with diode across R.
 series R and diode with C across R.
 R and C in series but with diode across C.

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Power Electronics
Which of following is normally ON device

  SIT.
 TRIAC.
 IGBT.
 BJT.

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Power Electronics
Spread time is defined as the interval during which

 both (A) and (B).
  anode current rises from 90 % to its final value.
 anode voltage drops from 10 % of its initial value to zero.
 anode current rises from 10 % to 90 % of its final value.

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Power Electronics
During reverse recovery time

  both B and C.
 charge carrier of junction J3 is swept out.
 charge carrier of junction J2 recombined.
 charge carrier of junction J1 is swept out.

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Power Electronics
SCRs are used in series to meet

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

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