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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

 60.
 65.
  37.14.
 3.714.

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Power Electronics
During reverse recovery time

 charge carrier of junction J1 is swept out.
 charge carrier of junction J2 recombined.
  both B and C.
 charge carrier of junction J3 is swept out.

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Power Electronics
Under normal operating condition voltage clamping device offers impedance of

 moderate value.
  high value.
 zero value.
 low value.

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Power Electronics
Gate circuit or triggering circuit of a thyristor is

 high power circuit.
  lower power circuit.
 magnetic circuit.
 may be low power or high power circuit.

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Power Electronics
Dynamic equalising circuit is useful

 for voltage equalisation.
 to limit di / dt of SCR.
 to limit dV / dt of SCR.
  both B and C.

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Power Electronics
What happen due to high di / dt?

 Insulation failure.
  Local hot spot.
 None of these.
 Breakdown of junction.

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