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Power Electronics

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

 60 mA.
  10 mA.
 40 mA.
 23 mA.

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Power Electronics
How can we protect SCR from thermal conditions ?

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

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Power Electronics
During reverse recovery time

 charge carrier of junction J3 is swept out.
 charge carrier of junction J1 is swept out.
  both B and C.
 charge carrier of junction J2 recombined.

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Power Electronics
A triac is equivalent to two SCRs ___________.

None of these
In inverse-parallel
In parallel
In series

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

Transistor
Diac
Triac
UJT

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Power Electronics
The typical time of rising time lies between

 10 - 20 µs.
  1 - 4 µs.
 90 - 100 µs.
 40 - 60 µs.

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