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Power Electronics

Power Electronics
The typical value of SCR for modern alternator is

 1.0.
 0.5.
 1.2.
 1.5.

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Power Electronics
60 thyrsistors are connected in series and parallel to form a 10 KV and 5.5 KA switch. Each thyristor is rated for 1.2 KV, 1 KA. The no. of parallel path are 6. The efficiency of the switch is

 90.9 %.
  76.3 %.
 91.6 %.
 83.3 %.

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Power Electronics
Materials used in heat sink should have

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

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Power Electronics
A diac has ___________ pn junctions

Two
None of these
Four
Three

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

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Power Electronics
If the anode current is 800 A, then the amount of current required to turn off the GTO is about

 400 A.
  200 A.
 20 A.
 600 A.

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