R05321101-biological-control-systems

Set No. 1

Code No: R05321101

III B.Tech Supplimentary Examinations, Aug/Sep 2008 BIOLOGICAL CONTROL SYSTEMS (Bio-Medical Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. Draw a generalized feedback control system. Label all variables and components and explain. [16] 2. (a) Discuss the various positive and negative feedback systems present in the human body. (b) The open loop transfer function of a servo sytem with a unity feedback system is given by 1 G(S) = (1+0.5S)(1+0.2S) Determine the damping ratio and the percent overshoot to a unit step. [6+10] 3. (a) Explain the necessary conditions for stability and also Routh stability criteria. (b) The characteristics of a system is S2 -(K+2)S+2K+5=0 Find the value of K for which the system is stable, limitedly stable and unstable. [6+10] 4. (a) Explain the visual fixation system with the help of an information flow diagram. (b) Draw the oculomotor response curves in the saccadic and smooth pursuit modes. [8+8] 5. Explain How Thermoregulation is achieved in human body.

[16]

6. Explain how Baroreceptors and Chemoreceptors are helpful in Cardiovascular system? [16] 7. Explain clearly about excretion control?

[16]

8. (a) Write in detail about the human operator models? (b) Explain about the human operator tracking characteristics? ⋆⋆⋆⋆⋆

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[8+8]

Set No. 2

Code No: R05321101

III B.Tech Supplimentary Examinations, Aug/Sep 2008 BIOLOGICAL CONTROL SYSTEMS (Bio-Medical Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Obtain the transfer function of the network as shown in figure 1a.

Figure 1a (b) Explain in brief a feedback control system.

[10+6]

2. A unity feed back control system has open loop transfer function 4×104 S(S+48.5)

Obtain the step response time at which the maximum overshoot occurs, and evaluate error constants for unit, ramp and parabolic-inputs. [16] 3. Draw the root locus for K G(S) H(S) = S(S+1)(S+3)

[16]

4. With an information flow diagram, explain pupil control system.

[16]

5. Develop a standard form of second order system for a free swinging human limb. [16] 6. Explain how Baroreceptors and Chemoreceptors are helpful in Cardiovascular system? [16] 7. Explain in detail about sugar level control mechanism?

[16]

8. Explain a Biological Control system in which receptor exhibits bidirectional? [16] ⋆⋆⋆⋆⋆

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Set No. 3

Code No: R05321101

III B.Tech Supplimentary Examinations, Aug/Sep 2008 BIOLOGICAL CONTROL SYSTEMS (Bio-Medical Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Obtain the transfer function of the network as shown in figure 1a.

Figure 1a (b) Explain in brief a feedback control system.

[10+6]

2. (a) Define transient and steady state condition of a control system. How laplace transform is more suitable for its analysis. (b) Discuss the four basics standard test signals for time response analysis with relevant figures and mathematical expressions. [8+8] 3. Discuss the response terms contributed by all possible types of roots with neat sketch of roots in S-plane and its corresponding impulse response. [16] 4. With an information flow diagram, explain pupil control system.

[16]

5. List out and explain the Thermo receptor characteristics.

[16]

6. Explain how Baroreceptors and Chemoreceptors are helpful in Cardiovascular system? [16] 7. Explain clearly about excretion control?

[16]

8. (a) What is a Biological Receptor? (b) What are the various Biological Receptors? (c) Explain briefly about stimulation mechanism and adaptation? ⋆⋆⋆⋆⋆

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[2+4+10]

Set No. 4

Code No: R05321101

III B.Tech Supplimentary Examinations, Aug/Sep 2008 BIOLOGICAL CONTROL SYSTEMS (Bio-Medical Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. Given the following system in figure 1. Find the transfer function (C/R).

[16]

Figure 1 2. Consider the unit step response of a unity-feedback control system, whose openloop transfer function is 1 G(S) = S(S+1) Obtain the rise time, peak time, maximum overshoot and settling time. [16] 3. Draw the root locus for K G(S) H(S) = S(S+1)(S+3)

[16]

4. Discuss the concept of Bio feedback in detail.

[16]

5. Obtain ξ and ωn for Semi-Circular Canal.

[16]

6. Explain how Baroreceptors and Chemoreceptors are helpful in Cardiovascular system? [16] 7. Give a short notes on : (a) Blood cortisol control (b) Blood Thyroxin control

[8+8]

8. Explain Receptor characteristics?

[16] ⋆⋆⋆⋆⋆

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