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2007exam2_solutions

# 2007exam2_solutions - Name EID Quiz 2 BME 365R Nov 2 2007 I...

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Name____________________________________ EID ______________ Quiz 2 BME 365R Nov. 2, 2007 I. Short Answer Feedback Controllers (3 points each) For the negative feedback system shown above, answer these questions: 1. In the closed loop transfer function, distortion (D) is reduced by: a. K/(1+KH) b. 1/(1+KH) c. KH d. K/(1-KH) 2. How large must K be to ensure that a 10% change in feed-forward gain will result in only a 0.1% change in closed loop gain? Assume G c =10 and H=1/10 a. 99 b. 990 c. 9990 d. 99990 .001 = 1/(1+K(10))*(0.1) 3. To improve frequency response. You would want to: a. make K very large b. make K very small c. make H constant, independent of frequency d. a and c

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e. b and c 4. If k=10 6 /(s+1) and H=1/10, then the closed loop transfer function is: a. 10 5 (s+10 6 ) b. 10 6 /(s+10 5 ) c. 10 4 (s+1) d. 10 6 /(s+10 3 ) Gc = K/1+KH 5. The low frequency (jω<10 3 ) gain in problem 4 is: a. 0.1 b. 1 c. 10 d. 100 Assume I add a PID controller before the feed-forward gain 6. Increasing K i will: a. decrease overshoot b. decrease settling time c. eliminate steady-state error d. all of the above II. Short answer Muscle Contraction Summary (1 point each) An αMN and the myocytes it innervates is called ___________________________ . Muscle contraction can be graded because of changes in ______________________ and ___________________. The action potential in the αMN arrives at the neuromuscular
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2007exam2_solutions - Name EID Quiz 2 BME 365R Nov 2 2007 I...

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