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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
60 thyrsistors are connected in series and parallel to form a 10 KV and 5.5 KA switch. Each thyristor is rated for 1.2 KV, 1 KA. The no. of parallel path are 6. The efficiency of the switch is

 90.9 %.
  76.3 %.
 83.3 %.
 91.6 %.

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Power Electronics
Anode current in an SCR consists of

  holes only.
  electrons only.
  either electron or holes.
  Both electron and holes.

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Power Electronics
Under over voltage condition impedance offered by the voltage clamping device is

 infinity.
 high.
  low.
 moderate.

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Power Electronics
What is used to protect the SCR from over current ?

  CB and fuse.
 Voltage clamping device.
 Heat sink.
 Snubber circuit.

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Power Electronics
When the temperature increases, the intrinsic stand off ratio ___________.

Essentially remains the same
None of these
Increases
Decreases

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