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Power Electronics

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

  10 mA.
 40 mA.
 23 mA.
 60 mA.

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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

 60.
 65.
 3.714.
  37.14.

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Power Electronics
During which time maximum conduction spreading take place in the thyristor during turn ON?

  Spread time.
 Rise time.
 Delay time.
 Same for every case.

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Power Electronics
SCRs are used in series to meet

 low current demand.
 low voltage demand.
  high voltage demand.
 high current demand.

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Power Electronics
The normal way to turn on a diac is by ___________.

Gate current
Gate voltage
None of these
Breakover voltage

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

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

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