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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

 120 A.
 110 A.
  150 A.
 100 A.

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Power Electronics
Which triggering is the most reliable?

  Thermal triggering.
  Gate triggering.
  dV / dt triggering.
  Forward voltage triggering.

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Power Electronics
If holding current of a thyristor is 2 mA then latching current should be

 0.009 A.
  0.004 A.
 0.002 A.
 0.01 A.

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Power Electronics
A step up chopper has input voltage 110 V and output voltage 150 V. The value of duty cycle is

  0.27.
  0.32.
  0.67.
  0.45.

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Power Electronics
The reverse recovery time of diode is trr = 3 μs and the rate off all of the diode current is di/dt = 30 A/μs. The storage charge current QRR is

 145 μs.
 130 μs.
  135 μs.
 140 μs.

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Power Electronics
To meet high current demand we use SCRs in

 anti parallel connection.
 both B and C.
 series connection.
  parallel connection.

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