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Power Electronics

Power Electronics
Which of following is not a power transistor?

 SITS.
 IGBTs.
 COOLMOS.
  TRIAC.

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

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

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Power Electronics
After proper turn on of thyristor

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

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Power Electronics
Thermal voltage VT can be given by

 qT/K.
  Kq/T.
 (K2/q)(T + 1/T - 1).
 KT/q.

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Power Electronics
Compared to transistor, ______________ have lower on state conduction losses and higher power handling capability

 TRIACs.
  Thyristor.
 MOSFETs.
 Semi conductor diodes.

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Power Electronics
Typical range of thyristor turn OFF time is

 3 - 10 µs.
 3 - 50 µs.
 3 - 500 µs.
  3 - 100 µs.

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