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Power Electronics

Power Electronics
The UJT may be used as ___________.

None of these
A rectifier
A sawtooth generator
Am amplifier

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

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

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

  GTO.
 SIT.
 SITH.
 SCR.

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Power Electronics
What is used to protect a thyristor from high di / dt conditions?

 Fuse.
 Snubber circuit.
  Inductor.
 Voltage clamping device.

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Power Electronics
After peak point, the UJT operates in the ___________ region.

Cut-off
None of these
Saturation
Negative resistance

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Power Electronics
If the anode current is 800 A, then the amount of current required to turn off the GTO is about

 20 A.
  200 A.
 600 A.
 400 A.

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