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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.
 3.714.
 60.
  37.14.

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Power Electronics
After peak point, the UJT operates in the ___________ region.

Negative resistance
None of these
Saturation
Cut-off

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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

 90.
  80.
 70.
 60.

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Power Electronics
How can we protect SCR from thermal conditions ?

  Using heat sink.
 Using equalizing circuit.
 Use of snubber circuit.
 Using CB and fuse.

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

  GTO.
 SCR.
 SIT.
 SITH.

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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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