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Power Electronics

Power Electronics
A UJT is sometimes called ___________ diode.

High resistance
Single-base
Double-base
Low resistance

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Power Electronics
Thyristor is nothing but a

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

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Power Electronics
BCT is used for

 Low power current control.
  High power phase control.
 High power current control.
 Low power phase control.

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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
What is used to protect the SCR from over current ?

 Voltage clamping device.
 Snubber circuit.
  CB and fuse.
 Heat sink.

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Power Electronics
What may happen high dV / dt?

 Breakdown of J2 junction.
 Unwanted turn ON.
  Both A and B.
 Anyone of these.

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