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Power Electronics

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

 BJT.
 None of above.
 MOSFET.
  Power dioed.

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Power Electronics
The capacitance of reversed bised junction J2 in a thyristor is CJ2 = 20 pF and can be assumed to be independant of the off state voltage. The limiting value of the charging current to turn on the thyristor is 16 mA. What is the critical value of dv/dt?

 1000 V/µs.
 600 V/µs.
  800 V/µs.
 1200 V/µs.

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Power Electronics
When the temperature increases, the intrinsic stand off ratio ___________.

Essentially remains the same
Increases
None of these
Decreases

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Power Electronics
A diac is simply ___________.

A three junction device
None of these
A single junction device
A triac without gate terminal

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

 60 mA.
 40 mA.
 23 mA.
  10 mA.

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

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

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