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Power Electronics

Power Electronics
When the temperature increases, the inter-base resistance (RBB) of a UJT ___________.

Decreases
Remains the same
Increases
None of these

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

  150 A.
 120 A.
 110 A.
 100 A.

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Power Electronics
The typical time of rising time lies between

 10 - 20 µs.
 40 - 60 µs.
  1 - 4 µs.
 90 - 100 µs.

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Power Electronics
When a UJT is turned ON, the resistance between emitter terminal and lower base terminal ___________

Remains the same
None of these
Is decreased
Is increased

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Power Electronics
What is used to protect the SCR from over current ?

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

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Power Electronics
A single phase full bridge inverter can operated in load commutation mode in case load consist of

 RLC overdamped.
 RLC critically damped.
 RLC underdamped.
 RL.

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