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Power Electronics

Power Electronics
Figure shows two thyristors rated 400 A sharing a load current. Current through T2 is 180A. Current through T1 will be

 110 A.
  150 A.
 120 A.
 100 A.

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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

 91.6 %.
  76.3 %.
 90.9 %.
 83.3 %.

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Power Electronics
Compared to transistor, ______________ have lower on state conduction losses and higher power handling capability

  Thyristor.
 Semi conductor diodes.
 TRIACs.
 MOSFETs.

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Power Electronics
Under normal operating condition voltage clamping device offers impedance of

 zero value.
  high value.
 low value.
 moderate value.

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Power Electronics
After peak point, the UJT operates in the ___________ region.

Cut-off
Saturation
Negative resistance
None of these

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

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