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Power Electronics

Power Electronics
Under over voltage condition impedance offered by the voltage clamping device is

 infinity.
 moderate.
  low.
 high.

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Power Electronics
Which of the following is not a characteristic of UJT?

Intrinsic stand off ratio
Negative resistance
Bilateral conduction
Peak-point voltage

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Power Electronics
The normal way to turn on a diac is by ___________.

Breakover voltage
None of these
Gate current
Gate voltage

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Power Electronics
To turn on UJT, the forward bias on the emitter diode should be ___________ the peak point voltage.

Equal to
Less than
More than
None of these

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Power Electronics
Example of a voltage clamping device

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

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Power Electronics
Thyristor is nothing but a

 Controlled transistor.
 Amplifier with higher gain.
 Amplifier with large current gain.
  Controlled switch.

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