h-parameter type representation in terms of transfer ratio

Q.  Which among the below stated notations of h-parameters is used to represent the short-circuit forward current transfer ratio?
- Published on 24 Sep 15

a. h11
b. h12
c. h21
d. h22

ANSWER: h21

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    Discussion

  • teja   -Posted on 07 Dec 17
    we know that for h parameters
    v1=h11i1+h12v2;
    i2=h21i1+h22v2;
    in question itself they given short ckt means v2=0;
    then we get
    h11=v1/i1 which is input impedance as v1,i1 are in input side
    h21=i2/i1 which is current gain;
  • Satyawati   -Posted on 29 Sep 15
    The 'h21' parameter in a hybrid equivalent model specifies the ratio of output current to input current especially when the output terminals are shorted.

    Since it also represents the ratio of similar quantity (current), it has no unit & hence also known as the short-circuit forward current transfer ratio.

    Simply, it represents the current gain of the circuit by shorting the output terminals.

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