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Power Electronics

Power Electronics
In a P1N1P2N2 thyristor which layer is less doped ?

  N1.
 P2.
 N2.
 P1.

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

Low
Extremely low
None of these
High

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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

 70.
  80.
 60.
 90.

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Power Electronics
Leakage current flows through the thyristor in

 reverse blocking mode.
 forward conduction mode.
  both forward and reverse blocking mode.
 forward blocking mode.

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Power Electronics
A triac is equivalent to two SCRs ___________.

In inverse-parallel
In series
In parallel
None of these

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Power Electronics
What is used to protect a thyristor from high di / dt conditions?

 Voltage clamping device.
  Inductor.
 Fuse.
 Snubber circuit.

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