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Power Electronics

Power Electronics
Which of following is not a power transistor?

 IGBTs.
 SITS.
  TRIAC.
 COOLMOS.

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Power Electronics
A GTO can be turned on by applying

 Positive drain signal.
  Positive gate signal.
 Positive source signal.
 None of these.

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Power Electronics
After proper turn on of thyristor

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

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Power Electronics
Example of a voltage clamping device

 snubber circuit.
 aluminium block.
  metal oxide varistor.
 fast acting fuse.

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Power Electronics
Power electronics essentially deals with control of a.c. power at ___________.

Frequencies above 20 kHz
Frequencies less than 10 Hz
50 Hz frequency
Frequencies above 1000 kHz

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Power Electronics
The triac is ___________.

Like a bidirectional SCR
Not a thyristor
None of these
A four-terminal device

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