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Power Electronics

Power Electronics
Figure shows two thyristors rated 400 A sharing a load current. Current through T2 is 180A. Current through T1 will be

 120 A.
 110 A.
  150 A.
 100 A.

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Power Electronics
Which of the following is not a characteristic of UJT?

Negative resistance
Peak-point voltage
Intrinsic stand off ratio
Bilateral conduction

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Power Electronics
A UJT is sometimes called ___________ diode.

Double-base
Low resistance
High resistance
Single-base

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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
What is used to protect the SCR from over current ?

 Voltage clamping device.
 Heat sink.
 Snubber circuit.
  CB and fuse.

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Power Electronics
Dynamic equalising circuit is useful

 to limit dV / dt of SCR.
 for voltage equalisation.
  both B and C.
 to limit di / dt of SCR.

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