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Power Electronics

Power Electronics
Figure shows two thyristors rated 400 A sharing a load current. Current through T2 is 180A. Current through T1 will be

 110 A.
  150 A.
 120 A.
 100 A.

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Power Electronics
Which of the following is used in heat sink?

 Iron.
 Carbon.
 Silver.
  Aluminium.

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Power Electronics
Between the peak point and the valley point of UJT emitter characteristics we have ___________ region

Negative resistance
None of these
Saturation
Cut-off

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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

  80.
 70.
 90.
 60.

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Power Electronics
The normal way to turn on a diac is by ___________.

None of these
Breakover voltage
Gate current
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

 91.6 %.
 90.9 %.
  76.3 %.
 83.3 %.

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