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Power Electronics

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

 23 mA.
 60 mA.
 40 mA.
  10 mA.

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Power Electronics
For series connected SCR’s dynamic equalising circuit consists of

  R and C in series but with diode across R.
 series R and diode with C across R.
 R and C in series but with diode across C.
 series R and diode with C across R.

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Power Electronics
During reverse recovery time

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

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Power Electronics
A diac has ___________ semiconductor layers

Two
None of these
Three
Four

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Power Electronics
Which of the following is used in SCR to protect from high dV / dt?

 Equalizing circuit.
  Snubber circuit.
 Fuse.
 Circuit breaker.

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Power Electronics
Dynamic equalising circuit is useful

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

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