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Power Electronics

Power Electronics
A diac is turned on by ___________.

A breakover voltage
Gate current
None of these
Gate voltage

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

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

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Power Electronics
Example of a voltage clamping device

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

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Power Electronics
For an SCR gate cathode characteristic is a straight line of 130. For triggered source volume of 15 V and allowable gate power dissipation of 0.5 W compute the gate source resistance?

  111.9 ohm
 115 ohm
 108 ohm
 11.19 ohm

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Power Electronics
A power MOSFET has three terminals called

 Collector, emitter and base.
 Collector, emitter and gate.
 Drain, source and base.
  Drain, source and gate.

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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

 0.75.
 0.7.
 0.2.
  0.25.

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