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

    2. A.
    30 kHz
    B.
    15 kHz
    C.
    5 kHz
    D.
    20 kHz

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    Answer : Option C

    Explanation :

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

    Hence supply frequency of 5 kHz will turn off the SCR by voltage reversal
    because = 200 μsec.

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