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Power Electronics

Power Electronics
The triac is ___________.

Like a bidirectional SCR
A four-terminal device
Not a thyristor
None of these

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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.
 90.
 70.
  80.

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Power Electronics
The reverse recovery time of diode is trr = 3 μs and the rate off all of the diode current is di/dt = 30 A/μs. The storage charge current QRR is

 140 μs.
 130 μs.
 145 μs.
  135 μs.

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Power Electronics
Calculate the maximum voltage that can be safely blocked by the string shown in figure, if maximum allowable leakage current is 2 mA?

 10 KV.
 6 KV.
 2 KV.
  8 KV.

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Power Electronics
SITH is also known as

  Filled controlled diode.
 None of these.
 Silicon controlled rectifier.
 Filled controlled rectifier.

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Power Electronics
Materials used in heat sink should have

  All of these.
 high thermal conductivity.
 large surface area.
 high melting point.

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