1.

The overall transfer function C(s)/R(s) of the system shown in the figure below is

A. \(\frac{{{G_1}{G_2}}}{{1 - {G_2}{H_1} + {G_1}{G_2}{H_1}}}\)
B. \(\frac{{{G_1}{G_2}}}{{1 + {G_1}{H_1} - {G_1}{G_2}{H_2}}}\)
C. \(\frac{{{G_1}{G_2}}}{{1 + {G_2}{H_1} + {G_1}{G_2}{H_2}}}\)
D. \(\frac{{{G_1}{G_2}}}{{{G_2}{H_1}{G_1}{H_1}{G_2}}}\)
Answer» D. \(\frac{{{G_1}{G_2}}}{{{G_2}{H_1}{G_1}{H_1}{G_2}}}\)


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