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Power Electronics

Power Electronics
Switching frequency of SITH is

  100 KHz.
 60 KHz.
 5 KHz.
 10 KHz.

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

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

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Power Electronics
Thyristor can be protected from over voltages by using

 snubber circuit.
 heat sink.
 fuse.
  voltage clamping device.

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Power Electronics
Materials used in heat sink should have

 large surface area.
  All of these.
 high melting point.
 high thermal conductivity.

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Power Electronics
When the emitter terminal of a UJT is open, the resistance between the base terminal is generally ___________.

Extremely low
High
None of these
Low

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Power Electronics
The UJT may be used as ___________.

A rectifier
A sawtooth generator
None of these
Am amplifier

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