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Power Electronics

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

 SCR.
  GTO.
 SIT.
 SITH.

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Power Electronics
A thyristor can termed as

  DC switch.
 Square wave switch.
 Both a and B.
 AC switch.

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Power Electronics
Which of the following is disadvantage of fast recovery diodes?

 Recovery is only 5 µs.
 Recovery is only 50 µs.
  Doping is carried out.
 None of these.

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

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Power Electronics
If a latching current for the circuit shown in figure is 2 mA. Obtain the value of minimum width of the property turn ON the SCR?

 3.2 µs
 3.1 µs
 3 µs.
  3.3 µs

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Power Electronics
A diac has ___________ pn junctions

Four
Two
None of these
Three

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