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Power Electronics

Power Electronics
Which of following devices has highest di/dt and dv/dt capability?

 SCR.
 SITH.
  GTO.
 SIT.

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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

 0.2.
 0.7.
 0.75.
  0.25.

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

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

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Power Electronics
Why resistor is used in Snubber circuit ?

  To minimize the discharging current.
 All of these.
 To minimize the charging current.
 To minimize the loss .

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Power Electronics
After proper turn on of thyristor

 gate signal is always present.
None of these
 gate signal should present but can be removed.
  gate signal must be removed.

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Power Electronics
A thyristor will be triggered when Vg = 1.5 volt and Ig = 100 mA in the given figure. Calculate the value of R in ohm is

  37.14.
 60.
 65.
 3.714.

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