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Power Electronics

Power Electronics
4 thyristors rated 200 V in series. The operating voltage of the string is 0.600 V. Derating factor of the string is

  0.25.
 0.75.
 0.7.
 0.2.

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

Decreases
Increases
Remains the same
None of these

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Power Electronics
Which triggering is the most reliable?

  Gate triggering.
  dV / dt triggering.
  Forward voltage triggering.
  Thermal triggering.

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Power Electronics
Between the peak point and the valley point of UJT emitter characteristics we have ___________ region

None of these
Saturation
Cut-off
Negative resistance

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Power Electronics
The maximum di/dt in a SCR is

 Directly proportional to supply voltage.
  Both A and B.
 Inversely proportional to supply voltage.
 Directly proportional to inductance in the circuit.

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Power Electronics
SITH is also known as

  Filled controlled diode.
 None of these.
 Silicon controlled rectifier.
 Filled controlled rectifier.

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