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Control SystemsBlock Diagram Reduction

Two parallel blocks G1(s) and G2(s) whose outputs are added have equivalent transfer function?

  • AG1G2
  • BG1+G2
  • CG1/G2
  • D1/(G1+G2)
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Correct Answer: B. G1+G2
Explanation: For parallel paths driven by the same input and summed positively, the equivalent transfer function is G1+G2.
Reference: Standard control systems: block diagram reduction
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