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Power Electronics

Power Electronics
Maximum power loss occurs during

 spread time.
 all.
 delay time.
  rise time.

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

Increases
Decreases
None of these
Remains the same

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Power Electronics
An SCR has half cycle surge current rating of 3000 A for 50 Hz supply. One cycle surge current will be

 1500 A.
 6000 A.
 2121.32 A.
 4242.64 A.

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Power Electronics
What is used to protect a thyristor from high di / dt conditions?

 Snubber circuit.
 Fuse.
 Voltage clamping device.
  Inductor.

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Power Electronics
How can we protect SCR from thermal conditions ?

 Using equalizing circuit.
 Using CB and fuse.
  Using heat sink.
 Use of snubber circuit.

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Power Electronics
Leakage current flows through the thyristor in

 reverse blocking mode.
  both forward and reverse blocking mode.
 forward blocking mode.
 forward conduction mode.

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