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Power Electronics

Power Electronics
Switching frequency of SITH is

 60 KHz.
 10 KHz.
 5 KHz.
  100 KHz.

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Power Electronics
A modern power semiconductor device that combines the characteristic of BJT and MOSFET is

 MCT.
 FCT.
  IGBT.
 GTO.

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Power Electronics
When the emitter terminal of a UJT is open, the resistance between the base terminal is generally ___________.

None of these
Low
Extremely low
High

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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.
  7, 5.
 5, 7.

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Power Electronics
If holding current of a thyristor is 2 mA then latching current should be

 0.009 A.
 0.002 A.
  0.004 A.
 0.01 A.

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

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

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