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Power Electronics

Power Electronics
A diac has ___________ semiconductor layers

Four
Two
Three
None of these

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

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

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Power Electronics
A thyristor string is made of a no. of SCR connected in series and parallel. The string have volume and current of 11 KV and 4 KA. The voltage and current rating of available SCRs are 1800 V and 1000 A. For a string efficiency of 90 % let the number of SCRs in series and parallel are a and b respectively. Then the value of a and b will be

 4, 6.
  7, 5.
 6, 4.
 5, 7.

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Power Electronics
A triac can pass a portion of ___________ half-cycle through the load.

Only positive
None of these
Both positive and negative
Only negative

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Power Electronics
Spread time is defined as the interval during which

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

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Power Electronics
How can we protect SCR from thermal conditions ?

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

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