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Power Electronics

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

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

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Power Electronics
Anode current in an SCR consists of

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

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Power Electronics
A thyristor will be triggered when Vg = 1.5 volt and Ig = 100 mA in the given figure. Calculate the value of R in ohm is

 65.
 60.
 3.714.
  37.14.

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Power Electronics
When the temperature increases, the intrinsic stand off ratio ___________.

Increases
Essentially remains the same
None of these
Decreases

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Power Electronics
Thyristor is nothing but a

 Controlled transistor.
 Amplifier with large current gain.
  Controlled switch.
 Amplifier with higher gain.

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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

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

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