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Power Electronics

Power Electronics
Switching frequency of SITH is

 5 KHz.
 60 KHz.
 10 KHz.
  100 KHz.

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

  N1.
 P1.
 P2.
 N2.

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Power Electronics
A single phase one pulse controlled circuit has a resistance R and counter emf E load 400 sin(314 t) as the source voltage. For a load counter emf of 200 V, the range of firing angle control is

 30° to 180°.
 60° to 120°.
 30° to 150°.
 60° to 180°.

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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

  135 μs.
 140 μs.
 145 μs.
 130 μs.

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Power Electronics
Anode current in an SCR consists of

  electrons only.
  holes only.
  either electron or holes.
  Both electron and holes.

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Power Electronics
Materials used in heat sink should have

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

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