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Power Electronics

Power Electronics
A diac has ___________ terminals.

Two
Four
None of these
Three

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

Negative resistance
Cut-off
Saturation
None of these

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Power Electronics
When a large surge current of very short duration flows through a thyristor then which one of the following device will operate to protect the thyristor ?

 Voltage clamping device.
 Snubber circuit.
 CB.
  Fast acting current limiting device (FACL fuse).

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

None of these
Increases
Decreases
Essentially remains the same

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Power Electronics
Switching frequency of SITH is

  100 KHz.
 60 KHz.
 5 KHz.
 10 KHz.

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