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Power Electronics

Power Electronics
Thyristor can be protected from over voltages by using

 heat sink.
 snubber circuit.
 fuse.
  voltage clamping device.

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

None of these
More than
Less than
Equal to

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Power Electronics
A diac is simply ___________.

A three junction device
A triac without gate terminal
None of these
A single junction device

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Power Electronics
The function of snubber circuit connected across the SCR is to

 decrease dV / dt.
 increase dV / dt.
  suppress dV / dt.
 decrease di / dt.

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Power Electronics
Spread time is defined as the interval during which

 anode current rises from 10 % to 90 % of its final value.
 both (A) and (B).
 anode voltage drops from 10 % of its initial value to zero.
  anode current rises from 90 % to its final value.

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Power Electronics
If holding current of a thyristor is 2 mA then latching current should be

 0.01 A.
 0.002 A.
  0.004 A.
 0.009 A.

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