The SCR would be turned OFF by voltage reversal of applied anode-cathode ac supply frequency of :

  1. 10 kHz
  2. 10 Hz
  3. 5 Hz
  4. 5 kHz
Anurag Mishra Professor Asked on 14th January 2016 in Physics.
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    Answer: 4. 5KHz

    For inverter grade SCR, typical turn off time (toff) is 5 to 50 μsec
    For converter grade SCR, turn off time = 50 to 100 μsec

    Supply frequency of 5 kHz will turn off the SCR by voltage reversal, because

    (1/ 5000Hz)  = 200 μsec.

    Pushpendra Pal Dean Answered on 16th January 2016.
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