Electrical Engineering MCQ Question Papers: Campus Placement

Subject: Control System 8

**Part 2: List for questions and answers of Control System II**

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**Q1. Find the angles of asymptotes of the open loop transfer function G(s) = k(s + 1)/s(s+2) ****(s+4)?**

**a) 90°,180°**

**b) 0°, 180°**

**c) 90°,270°**

**d) 60°,240°**

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**Q2. Angle condition for complimentary root locus or inverse root locus is**

**a) ± (2q + 1) 180°**

**b) ± (2q) 180°**

**c) ± (2q + 1) 360°**

**d) ± (2q) 360°**

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**Q3. Angle of asymptotes for complimentary root locus is**

**a) (2q+1)*180/(P-Z)**

**b) (2q+1)*180/P**

**c) (2q)*180/(P-Z)**

**d) (2q)*180/P**

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**Q4. The characteristic equation of a control system is given below: F(s) = s4 + s3³ +3s² + 2s ****+5 =0. The system is**

**a) Stable**

**b) Marginally stable**

**c) Unstable**

**d) Critical stable**

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**Q5. A unity feedback system has forward transfer function G(s) = k/((s(s+3)(s+10). The range ****of k for the system to be stable is**

**a) less than k less than 390**

**b) less than k less than 39**

**c) less than k less than 3900**

**d) None of the above**

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**Q6. The open loop transfer function of a unity feedback system is given by G(s) = 1/(s+2)². ****The closed loop transfer function will have poles at**

**a) -2,-2**

**b) -2,-1**

**c) -2+j,-2-j**

**d) -2,2 **

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**Q7. A transfer function has its zero in the right half of the s-plane. The function**

**a) Is positive real**

**b) Is minimum phase**

**c) Is non-minimum phase**

**d) Will give stable impulse response**

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**Q8.Electrical analogous element for damper element in mechanical translation system?**

**a) Capacitor**

**b) Inductor**

**c) Resistor**

**d) Any of the above**

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**Q9. When deriving the transfer function of linear element**

**a) Both initial conditions and loading are taken into account**

**b) Initial conditions are taken into account but the element is assumed to be not loaded**

**c) Initial conditions are assumed to be zero but loading is taken into account**

**d) Initial conditions are assumed to be zero and the element is assumed to be not**

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**Q10. Consider the function F(s) = ω /(s²+ω ²). Where F(s) = Laplace transform of f(t). The final ****value of f(t) is equal to**

**a) Zero**

**b) Infinite**

**c) Finite constant**

**d) A value between -1 and +1**

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**Q11. What will be the type of the system, if the steady state performance of control system ****yields a non zero finite value of the velocity error constant?**

**a) Type – 0**

**b) Type – 1**

**c) Type – 2**

**d) Type – 3**

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**Q12. A transfer function has a zero at s = -1 and poles at s = -1 ± j1. The multiplier being ****unity, if the input is step function, the steady state response is given by**

**a) 0.5**∠ **0****°**

**b) 0.5**∠ **0****°**

**c) 1**∠ **0****°**

**d) 2**∠ **90****°**** **

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**Q13. The transfer function of the system described by d²/dt²(y(t)) + 3d/dt(y(t)) + 2y(t) = 5u(t)**

**with u(t) as input and y(t) as output is**

**a) 5/(s²+3s+2)**

**b) 5/s(s²+3s+2)**

**c) (s²+3s+2)/5**

**d) s(s²+3s+2)/5**

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**Q14. Transfer function of a control system depends on**

**a) Initial conditions of input and output**

**b) System parameters alone**

**c) Nature of output**

**d) Nature of input**

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**Q15. The poles of the second order system is at -3 ± j4. The damping ratio of the system is**

**a) 3/4**

**b) 3/7**

**c) 3/5**

**d) 4/5**

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**Q16 The characteristic equation has the following roots for over damped stable system?**

**a) -2,-2**

**b) -2±j4**

**c) -2,-4**

**d) -2,2**

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**Q17. The transfer function of a linear time invariant system is given as G(s) = 10/(s² + 10s + ****10). The steady state value of the output of the system for step input applied at time instant ****t=2 sec will be**

**a) 0**

**b) 1**

**c) Infinity**

**d) Undefined**

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**Q18. The error of a system to a ramp input is 1/5, if the type of the system is decreased by ****one, then the error of unit step input is**

**a) 0.2**

**b) 0.167**

**c) 5**

**d) 6/5 **

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**Q19. the closed loop transfer function of a unity feedback control system is 9/(s² + 3s + 9), ****then the type of the system is**

**a) 3**

**b) 0**

**c) 2**

**d) 1**

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**Q20. The closed loop transfer function of a system is 25/(s² + 25). The settling time of the ****system is**

**a) 5 sec**

**b) 1 sec**

**c) 8 sec**

**d) 25 sec **

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**Part 2: List for questions and answers of Control System II**

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**Q1. Answer: c**

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**Q2. Answer: b**

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**Q3. Answer: c**

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**Q4. Answer: c**

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**Q5. Answer: a**

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**Q6. Answer: c**

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**Q7. Answer: c**

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**Q8. Answer: c**

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**Q9. Answer: c**

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**Q10. Answer: d**

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**Q11. Answer: b**

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**Q12. Answer: a**

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**Q13. answer: a**

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**Q14. Answer: b**

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**Q15. Answer: c**

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**Q16. Answer: c**

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**Q17. Answer: b**

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**Q18. Answer: b**

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**Q19. Answer: a**

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**Q20. Answer: b**