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Power Electronics

Power Electronics
A triac has ___________ semiconductor layers.

Four
Two
Three
Five

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Power Electronics
For series connected SCR’s dynamic equalising circuit consists of

 series R and diode with C across R.
  R and C in series but with diode across R.
 R and C in series but with diode across C.
 series R and diode with C across R.

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Power Electronics
BCT is used for

 Low power phase control.
  High power phase control.
 Low power current control.
 High power current control.

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

Saturation
None of these
Negative resistance
Cut-off

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Power Electronics
Thermal voltage VT can be given by

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

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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.
  100 µs.
 300 µs.
 200 µs.

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