Multiple choice

Two systems H1 (z) and H2 (z) are connected in cascade as shown below. The overall output y(n) is the same as the input x(n) with a one unit delay. The transfer function of the second system H2 (z) is

  1. $\dfrac{ (1-0.6z^{-1}) }{z^{-1} (1-0.4z^{-1}) }$
  2. $\dfrac{ z^{-1} (1-0.6z^{-1}) }{ (1-0.4z^{-1}) }$
  3. $\dfrac{ z^{-1} (1-0.4z^{-1}) }{ (1-0.6z^{-1}) }$
  4. $\dfrac{ (1-0.4z^{-1}) }{ z^{-1}(1-0.6z^{-1}) }$
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B Correct answer
Explanation

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