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Power Electronics

Power Electronics
To turn on UJT, the forward bias on the emitter diode should be ___________ the peak point voltage.

None of these
Less than
More than
Equal to

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Power Electronics
Calculate the maximum voltage that can be safely blocked by the string shown in figure, if maximum allowable leakage current is 2 mA?

 10 KV.
 2 KV.
  8 KV.
 6 KV.

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Power Electronics
Why resistor is used in Snubber circuit ?

 To minimize the charging current.
  To minimize the discharging current.
 All of these.
 To minimize the loss .

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Power Electronics
SCRs are used in series to meet

 high current demand.
  high voltage demand.
 low voltage demand.
 low current demand.

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Power Electronics
During which time maximum conduction spreading take place in the thyristor during turn ON?

 Same for every case.
  Spread time.
 Delay time.
 Rise time.

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Power Electronics
Under normal operating condition voltage clamping device offers impedance of

 moderate value.
 low value.
 zero value.
  high value.

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