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Power Electronics

Power Electronics
The latching current of SCR is 20 mA. Its holding current will be

 60 mA.
 23 mA.
 40 mA.
  10 mA.

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Power Electronics
Which semiconductor device acts like a diode and two transistor?

 SCR.
  Triac.
 UJT.
 Diac.

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Power Electronics
The function of snubber circuit connected across the SCR is to

 decrease di / dt.
 increase dV / dt.
 decrease dV / dt.
  suppress dV / dt.

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Power Electronics
CB used for over current protection of thyristor operates when the fault current is

 neither (A) nor (B).
  of long period.
 both (A) and (B).
 of short duration.

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Power Electronics
A GTO can be turned on by applying

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

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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

  37.14.
 3.714.
 65.
 60.

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