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Power Electronics

Power Electronics
When the temperature increases, the inter-base resistance (RBB) of a UJT ___________.

None of these
Decreases
Remains the same
Increases

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Power Electronics
COOLMOS device can be used in application up to power range of

 500 VA.
 1 KVA.
  2 KVA.
 100 KVA.

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Power Electronics
A string of n parallel SCRs is operated at 72 KA, the rating of each SCR is 1 KA. If derating factor of the string is 0.1. Then calculate the value of n

 60.
 70.
  80.
 90.

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Power Electronics
Anode current in an SCR consists of

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

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Power Electronics
BCT is used for

 Low power phase control.
 High power current control.
 Low power current control.
  High power phase control.

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

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

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