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Power Electronics

Power Electronics
A triac has ___________ semiconductor layers.

Four
Five
Two
Three

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Power Electronics
Typical range of thyristor turn OFF time is

 3 - 10 µs.
 3 - 50 µs.
 3 - 500 µs.
  3 - 100 µs.

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Power Electronics
If holding current of a thyristor is 2 mA then latching current should be

  0.004 A.
 0.01 A.
 0.002 A.
 0.009 A.

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Power Electronics
Latching current for an SCR inserted between a dc voltage source of 200 V and load is 100 mA. Compute the minimum rate of width pulse required to turn ON the SCR in case load consists of R = 20 Ω in series with L = 0.2 H.

 150 µs.
 300 µs.
 200 µs.
  100 µs.

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Power Electronics
In a P1N1P2N2 thyristor which layer is less doped ?

 P2.
 N2.
 P1.
  N1.

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Power Electronics
The device that exhibits negative resistance region is ___________.

Triac
Transistor
Diac
UJT

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