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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

 0.7.
  0.25.
 0.75.
 0.2.

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Power Electronics
Maximum power loss occurs during

 spread time.
 all.
  rise time.
 delay time.

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

 Snubber circuit.
 Fuse.
 Voltage clamping device.
  Inductor.

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Power Electronics
Practical way of obtaining static voltage equalization in series connected SCRs is by the use of

 one resistor in series with each SCR.
 resistors of different values across each SCR.
  resistors of the same value across each SCR.
 one resistor across the string.

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Power Electronics
A diac has ___________ pn junctions

Two
Four
Three
None of these

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Power Electronics
A step up chopper has input voltage 110 V and output voltage 150 V. The value of duty cycle is

  0.67.
  0.32.
  0.45.
  0.27.

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