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Power Electronics

Power Electronics
The latching current of SCR is 20 mA. Its holding current will be

 23 mA.
 40 mA.
  10 mA.
 60 mA.

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Power Electronics
A diac is ___________ switch

An c.
A mechanical
A d.c.
None of these

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Power Electronics
The device that exhibits negative resistance region is ___________.

Transistor
Triac
Diac
UJT

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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
Light triggering mainly used in

 medium voltage direct current transmission.
  high voltage direct current transmission.
  all of these.
 low - voltage direct current transmission.

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Power Electronics
A GTO can be turned on by applying

 Positive source signal.
 None of these.
  Positive gate signal.
 Positive drain signal.

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