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Power Electronics

Power Electronics
A UJT is sometimes called ___________ diode.

Double-base
High resistance
Low resistance
Single-base

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Power Electronics
A diac has ___________ semiconductor layers

Three
None of these
Four
Two

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Power Electronics
A thyristor string is made of a no. of SCR connected in series and parallel. The string have volume and current of 11 KV and 4 KA. The voltage and current rating of available SCRs are 1800 V and 1000 A. For a string efficiency of 90 % let the number of SCRs in series and parallel are a and b respectively. Then the value of a and b will be

 6, 4.
 4, 6.
 5, 7.
  7, 5.

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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

 90.
  80.
 60.
 70.

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Power Electronics
By which one of the following we can measure the reliability of a string?

 Factor of safety.
  Derating factor.
 Reliability factor.
 String efficient.

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Power Electronics
Which of following is normally ON device

 BJT.
 IGBT.
  SIT.
 TRIAC.

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