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Power Electronics

Power Electronics
To turn on UJT, the forward bias on the emitter diode should be ___________ the peak point voltage.

Less than
None of these
Equal to
More than

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Power Electronics
A GTO can be turned on by applying

 Positive source signal.
 None of these.
 Positive drain signal.
  Positive gate signal.

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Power Electronics
Which of following devices has highest di/dt and dv/dt capability?

  GTO.
 SITH.
 SCR.
 SIT.

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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

 130 μs.
 145 μs.
 140 μs.
  135 μs.

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Power Electronics
A string of n parallel SCRs is operated at 72 KA, the rating of each SCR is 1 KA. If derating factor of the string is 0.1. Then calculate the value of n

 70.
 60.
 90.
  80.

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Power Electronics
Anode current in an SCR consists of

  either electron or holes.
  electrons only.
  Both electron and holes.
  holes only.

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