Electronic Engineering MCQ Question Papers: ENTC, IT Interview Placement

Subject: Control Systems 4

**Part 4: List for questions and answers of Control Systems**

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**Q1. How many digital inputs are present in plcs?**

**a) 4**

**b) 8**

**c) 16**

**d) 32**

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**Q2. In addition to storage instructions, plc controls __________**

**a) Logic sequence timing**

**b) Counting**

**c) Arithmetic operations**

**d) all of the above**

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**Q3. In p-d controller, the derivative action plays a significant role in increasing _______ of ****response**

**a) Time**

**b) Distance**

**c) speed**

**d) Volume**

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**Q4. Which among the following plays a crucial role in determining the state of dynamic ****system?**

**a) state variables**

**b) State vector**

**c) State space**

**d) State scalar**

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**Q5. Which among the following are the interconnected units of state diagram ****representation?**

**a) Scalars**

**b) Adders**

**c) Integrators**

**d) all of the above **

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**Q6. Consider the system represented by the equation given below. What would be the total ****phase value at w = 0? ****200/ [s^3 (s + 3) (s + 6) (s + 10)]**

**a) -90°**

**b) -180°**

**c) -270°**

**d) -360°**

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**Q7. Due to an addition of pole at origin, the polar plot gets shifted by ___ at w= 0?**

**a) -45°**

**b) -60°**

**c) -90°**

**d) -18°**

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**Q8. If a pole is located at origin, how does it get represented on the magnitude plot?**

**a) -10 log (w) db**

**b) -20 log (w) db**

**c) -40 log (w) db**

**d) -60 log (w) db**

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**Q9. According to the principle of log-scales, if the ratio between two points is same, then ****the two points get ________equally**

**a) United**

**b) separated**

**c) Multiplexed**

**d) Mixed**

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**Q10. How is the sinusoidal transfer function obtained from the system transfer function in ****frequency domain?**

**a) Replacement of ‘w’ by ‘s’**

**b) replacement of ‘s’ by ‘w’**

**c) Replacement of ‘s’ by ‘w’**

**d) Replacement of ‘w’ by ‘s’**

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**Q11. Which plots in frequency domain represent the two separate plots of magnitude and ****phase against frequency in logarithmic value?**

**a) Polar plots**

**b) bode plots**

**c) Nyquist plots**

**d) All of the above **

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**Q12. If the system is specified by open loop transfer function g(s)h(s) = k / s(s+3) (s + 2), how ****many root loci proceed to end at infinity?**

**a) 2**

**b) 3**

**c) 5**

**d) 6**

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**Q13. What should be the nature of root locus about the real axis?**

**a) Assymetric**

**b) symmetric**

**c) Exponential**

**d) Decaying**

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**Q14. Which point on root locus specifies the meeting or collision of two poles?**

**a) Centroid**

**b) break away point**

**c) Stability point**

**d) Anti-break point**

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**Q15. For drawing root locus, the angle of asymptote yields the direction along which ****_________branches approach to infinity**

**a) P + z**

**b) p – z**

**c) P / z**

**d) P x z**

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**Q16. In a second order system, if the damping ratio is greater than equal to ‘1’, then what ****would be the nature of roots?**

**a) Imaginary**

**b) real and equal**

**c) Real but not equal**

**d) Complex conjugate**

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**Q17. In routh array, if zero is found in the first column, then by which term it needs to be ****replaced?**

**a) ****d**

**b) n**

**c) ****s**

**d) e **

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**Q18. In accordance to relative stability, the settling time exhibits inversely proportional ****nature to ________parts of roots**

**a) Real positive**

**b) real negative**

**c) Imaginary positive**

**d) Imaginary negative**

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**Q19. Consider that the pole is located at origin and its laplace representation is 1/s. What ****would be the nature of pole response?**

**a) Rising exponential**

**b) Decaying exponential**

**c) Sinusoidal**

**d) constant value**

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**Q20. Which among the following controls the speed of d.c. motor?**

**a) Galvanometer**

**b) Gauss meter**

**c) Potentiometer**

**d) tachometer **

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**Part 4: List for questions and answers of Control Systems**

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**Q1. Answer: c**

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**Q2. Answer: d**

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**Q3. Answer: c**

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**Q4. Answer: a**

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**Q5. Answer: d**

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**Q6. Answer: c**

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**Q7. Answer: c**

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**Q8. Answer: b**

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**Q9. Answer: b**

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**Q10. Answer: b**

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**Q11. Answer: b**

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**Q12. Answer: b**

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**Q13. Answer: b**

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**Q14. Answer: b**

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**Q15. Answer: b**

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**Q16. Answer: b**

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**Q17. Answer: d**

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**Q18. Answer: b**

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**Q19. Answer: d**

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**Q20. Answer: d**