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From the circuits shown below, find the combined Z-parameter Z11.

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From the circuits shown below, find the combined Z-parameter Z11.

(a) 8

(b) 18

(c) 28

(d) 38
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Correct option is (b) 18

The explanation: The Z-parameter Z11 is Z11 = Z11x + Z11y and Z11x = 3, Z11y = 15. On substituting we get Z11 = 3 +15 = 18Ω.
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