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Power Electronics

Power Electronics
Which semiconductor device acts like a diode and two transistor?

 UJT.
 Diac.
 SCR.
  Triac.

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Power Electronics
Example of a voltage clamping device

 snubber circuit.
 aluminium block.
 fast acting fuse.
  metal oxide varistor.

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Power Electronics
What is used to protect a thyristor from high di / dt conditions?

 Voltage clamping device.
 Snubber circuit.
 Fuse.
  Inductor.

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Power Electronics
A diac is turned on by ___________.

Gate voltage
None of these
Gate current
A breakover voltage

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Power Electronics
Thermal voltage VT can be given by

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

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Power Electronics
Switching frequency of SITH is

 5 KHz.
 10 KHz.
  100 KHz.
 60 KHz.

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