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Power Electronics

Power Electronics
When the temperature increases, the inter-base resistance (RBB) of a UJT ___________.

Decreases
None of these
Increases
Remains the same

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

Breakover voltage
Gate voltage
Gate current
None of these

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Power Electronics
BCT is used for

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

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Power Electronics
How can we protect SCR from thermal conditions ?

 Using CB and fuse.
  Using heat sink.
 Using equalizing circuit.
 Use of snubber circuit.

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

 Fuse.
 Voltage clamping device.
  Inductor.
 Snubber circuit.

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Power Electronics
Which of following is normally ON device

  SIT.
 IGBT.
 BJT.
 TRIAC.

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