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Power Electronics

Power Electronics
A diac is turned on by ___________.

A breakover voltage
Gate voltage
None of these
Gate current

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Power Electronics
Example of a voltage clamping device

  metal oxide varistor.
 fast acting fuse.
 snubber circuit.
 aluminium block.

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

Remains the same
Decreases
Increases
None of these

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Power Electronics
Gate circuit or triggering circuit of a thyristor is

 may be low power or high power circuit.
 magnetic circuit.
 high power circuit.
  lower power circuit.

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Power Electronics
Maximum power loss occurs during

 spread time.
 delay time.
  rise time.
 all.

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Power Electronics
By which one of the following we can measure the reliability of a string?

 Reliability factor.
  Derating factor.
 String efficient.
 Factor of safety.

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