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Power Electronics

Power Electronics
After peak point, the UJT operates in the ___________ region.

Saturation
Cut-off
None of these
Negative resistance

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Power Electronics
The typical time of rising time lies between

 10 - 20 µs.
  1 - 4 µs.
 40 - 60 µs.
 90 - 100 µs.

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Power Electronics
During which time maximum conduction spreading take place in the thyristor during turn ON?

 Same for every case.
 Rise time.
 Delay time.
  Spread time.

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Power Electronics
After proper turn on of thyristor

 gate signal is always present.
None of these
  gate signal must be removed.
 gate signal should present but can be removed.

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

Diac
UJT
Triac
Transistor

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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.

  100 µs.
 300 µs.
 200 µs.
 150 µs.

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