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Power Electronics

Power Electronics
Which following is a two terminal three layer device?

 MOSFET.
  Power dioed.
 BJT.
 None of above.

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Power Electronics
If a latching current for the circuit shown in figure is 2 mA. Obtain the value of minimum width of the property turn ON the SCR?

 3.2 µs
 3.1 µs
  3.3 µs
 3 µs.

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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 short duration.
  of long period.
 both (A) and (B).

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

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

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Power Electronics
Thermal voltage VT can be given by

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

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Power Electronics
A triac is equivalent to two SCRs ___________.

In inverse-parallel
In parallel
None of these
In series

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