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Power Electronics

Power Electronics
A thyristor will be triggered when Vg = 1.5 volt and Ig = 100 mA in the given figure. Calculate the value of R in ohm is

 65.
 60.
  37.14.
 3.714.

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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.
 140 μs.
  135 μs.
 145 μs.

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Power Electronics
To meet high current demand we use SCRs in

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

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Power Electronics
Which of the following is disadvantage of fast recovery diodes?

 Recovery is only 5 µs.
  Doping is carried out.
 Recovery is only 50 µs.
 None of these.

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

 SITH.
 SIT.
 SCR.
  GTO.

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Power Electronics
A single phase full bridge inverter can operate in load commutation mode in case load consists of

 RLC overdamped.
 RL.
 RLC critically damped.
  RLC underdamped.

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