To illustrate how feedback is used to attenuate the effect of parameter disturbances on the controlled variable, compute the transfer functions Y/R for the following open and closed loop control systems. The control is the K block and the plant is ?G. The parameter variation is represented as the additive perturbation, .
What will be an ideal response?
Observe that for moderate variations in G, 
the closed loop system, b, reduces the variations by the factor 
This factor is called the Return Difference (RD).
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What will be an ideal response?
A substance with high toxicity exhibits which of the following traits?
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What will be an ideal response?
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What will be an ideal response?