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Power Electronics

Power Electronics
A diac has ___________ terminals.

None of these
Four
Two
Three

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Power Electronics
Thermal voltage VT can be given by

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

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Power Electronics
The normal way to turn on a diac is by ___________.

Gate voltage
Gate current
None of these
Breakover voltage

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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.

 300 µs.
  100 µs.
 200 µs.
 150 µs.

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

  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.
 series R and diode with C across R.

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Power Electronics
A power MOSFET has three terminals called

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

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