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Power Electronics

Power Electronics
A diac has ___________ terminals.

None of these
Two
Four
Three

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Power Electronics
Which of following is normally ON device

 TRIAC.
  SIT.
 IGBT.
 BJT.

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Power Electronics
If the anode current is 800 A, then the amount of current required to turn off the GTO is about

 400 A.
  200 A.
 20 A.
 600 A.

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Power Electronics
A power MOSFET has three terminals called

 Collector, emitter and gate.
 Collector, emitter and base.
  Drain, source and gate.
 Drain, source and base.

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Power Electronics
The V-I characteristics for a triac in the first and third quadrants are essentially identical to those of ___________ in its first quadrant

SCR
Transistor
None of these
UJT

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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?

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

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