Electronic Engineering MCQ Question Papers: ENTC, IT Interview Placement

Subject: Control Systems 2

**Part 2: List for questions and answers of Control Systems**

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**Q1. Which among the following units of plc is adopted to convey the control plan to cpu?**

**a) Memory**

**b) Power supply unit**

**c) I/o interface**

**d) programming software**

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**Q2. Which architectural unit/block of plc decides the sequence of different operations to be ****executed by means of instructions written in memory?**

**a) Memory**

**b) Programming software**

**c) I/o interface**

**d) cpu**

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**Q3. Which among the following is a unique model of a system?**

**a) transfer function**

**b) State variable**

**c) Both a and b**

**d) None of the above**

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**Q4. Which among the following is a disadvantage of modern control theory?**

**a) Implementation of optimal design**

**b) Transfer function can also be defined for different initial conditions**

**c) Analysis of all systems take place**

**d) necessity of computational work**

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**Q5. According to the property of state transition method, e0 is equal to _____**

**a) i**

**b) A**

**c) E-^at**

**d) -e^at**

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**Q6. Which mechanism in control engineering implies an ability to measure the state by ****taking measurements at output?**

**a) Controllability**

**b) observability**

**c) Differentiability**

**d) Adaptability **

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**Q7. State model representation is possible using _________**

**a) Physical variables**

**b) Phase variables**

**c) Canonical state variables**

**d) all of the above**

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**Q8. Which among the following constitute the state model of a system in addition to state ****equations?**

**a) Input equations**

**b) output equations**

**c) State trajectory**

**d) State vector**

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**Q9. Which principle specifies the relationship between enclosure of poles & zeros by s-plane ****contour and the encirclement of origin by q(s) plane contour?**

**a) argument**

**b) Agreement**

**c) Assessment**

**d) Assortment**

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**Q10. If a nyquist plot of g (jω ) h (jω ) for a closed loop system passes through (-2, j0) point in ****gh plane, what would be the value of gain margin of the system in db?**

**a) 0 db**

**b) 2.0201 db**

**c) 4 db**

**d) 6.0205 db**

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**Q11. For nyquist contour, the size of radius is _______**

**a) 25**

**b) 0**

**c) 1**

**d) 8**

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**Q12. Consider a feedback system with gain margin of about 30. At what point does nyquist ****plot crosses negative real axis?**

**a) -3**

**b) -0.3**

**c) -30**

**d) -0.03 **

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**Q13. According to nyquist stability criterion, where should be the position of all zeros of q(s) ****corresponding to s-plane?**

**a) on left half**

**b) At the center**

**c) On right half**

**d) Random**

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**Q14. If the system is represented by g(s) h(s) = k (s+7) / s (s +3) (s + 2), what would be its ****magnitude at ω = 8?**

**a) 0**

**b) 8**

**c) 7/10**

**d) 21**

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**Q15. If the unity feedback system is given by the open loop transfer function g(s) = ks2 / [(1 ****+ 0.3s) (1+ 0.05s)], what would be the initial slope of magnitude plot?**

**a) 20 db/decade**

**b) 40 db/decade**

**c) 60 db/decade**

**d) Unpredictable**

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**Q16. If the constant ‘k’ is positive, then what would be its contribution on the phase plot?**

**a) 0°**

**b) 45°**

**c) 90°**

**d) 180°**

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**Q17. The system is said to be marginally stable, if gain margin is ______**

**a) 0**

**b) 1**

**c) +8**

**d) None of the above**

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**Q18. If the phase angle at gain crossover frequency is estimated to be -105°, what will be ****the value of phase margin of the system?**

**a) 23°**

**b) 45°**

**c) 60°**

**d) 75° **

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**Q19. At which frequency does the magnitude of the system becomes zero db?**

**a) Resonant frequency**

**b) Cut-off frequency**

**c) gain crossover frequency**

**d) Phase crossover frequency**

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**Q20. The frequency at which the phase of the system acquires ____ is known as ‘phase ****crossover frequency’.**

**a) 90°**

**b) -90°**

**c) 180°**

**d) -180° **

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**Part 2: List for questions and answers of Control Systems**

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**Q1. Answer: d**

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**Q2. Answer: d**

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**Q3. Answer: a**

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**Q4. Answer: d**

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**Q5. Answer: a**

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**Q6. Answer: b**

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**Q7. Answer: d**

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**Q8. Answer: b**

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**Q9. Answer: a**

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**Q10. Answer: d**

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**Q11. Answer: d**

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**Q12. Answer: b**

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**Q13. Answer: a**

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**Q14. Answer: a**

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**Q15. Answer: b**

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**Q16. Answer: a**

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**Q17. Answer: c**

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**Q18. Answer: d**

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**Q19. Answer: c**

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**Q20. Answer: d**