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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
By which one of the following we can measure the reliability of a string?

 Reliability factor.
 Factor of safety.
  Derating factor.
 String efficient.

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Power Electronics
A diac is turned on by ___________.

A breakover voltage
None of these
Gate current
Gate voltage

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Power Electronics
The latching current of GTO should be of order

 1 A.
 2 A.
  500 mA.
 100 mA.

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Power Electronics
Thermal voltage VT can be given by

  Kq/T.
 qT/K.
 KT/q.
 (K2/q)(T + 1/T - 1).

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

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

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