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Power Electronics

Power Electronics
Thyristor can be protected from over voltages by using

 fuse.
  voltage clamping device.
 snubber circuit.
 heat sink.

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Power Electronics
A diac is simply ___________.

None of these
A single junction device
A three junction device
A triac without gate terminal

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Power Electronics
When the temperature increases, the intrinsic stand off ratio ___________.

None of these
Decreases
Increases
Essentially remains the same

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Power Electronics
60 thyrsistors are connected in series and parallel to form a 10 KV and 5.5 KA switch. Each thyristor is rated for 1.2 KV, 1 KA. The no. of parallel path are 6. The efficiency of the switch is

 91.6 %.
 83.3 %.
 90.9 %.
  76.3 %.

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Power Electronics
Which of following is normally ON device

  SIT.
 IGBT.
 TRIAC.
 BJT.

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Power Electronics
Latching current for an SCR inserted between a dc voltage source of 200 V and load is 100 mA. Compute the minimum rate of width pulse required to turn ON the SCR in case load consists of R = 20 Ω in series with L = 0.2 H.

 150 µs.
 300 µs.
  100 µs.
 200 µs.

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