What is the overall transfer function (C/R) of the following block diagram if G = G1. G2. G3 and H = H1.H2 ?
Correct answer: B. G/(1 + GH)
- A. 1/(1 + GH)
- B. G/(1 + GH)
- C. H/(1 + GH)
- D. G/(1 - GH)
Explanation
For a standard negative-feedback loop, the closed-loop transfer function is the forward-path gain divided by one plus the loop gain: C/R = G/(1 + GH). With G = G1G2G3 and H = H1H2, this corresponds to option b.
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