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Power Electronics

Power Electronics
A step up chopper has input voltage 110 V and output voltage 150 V. The value of duty cycle is

  0.45.
  0.32.
  0.67.
  0.27.

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Power Electronics
After proper turn on of thyristor

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

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

 Fuse.
 Voltage clamping device.
 Snubber circuit.
  Inductor.

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Power Electronics
The normal way to turn on a diac is by ___________.

Breakover voltage
None of these
Gate current
Gate voltage

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

Negative resistance
Saturation
Cut-off
None of these

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Power Electronics
CB used for over current protection of thyristor operates when the fault current is

 neither (A) nor (B).
 both (A) and (B).
  of long period.
 of short duration.

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