M.E/M.TECH DEGREE EXAMINATION DEC 2013MODEL EXAMINATIONAPPLIED ELECTRONICS

FIRST SEMESTERAP7003 - DIGITAL CONTROL ENGINEERING

Time: 3hrs Maximum: 100 MarksDate: 11/12/13 Year: I ME

PART-A [10 X 2 = 20 Marks]

1. What is the basic difference between analog and digital controllers?2. How KP, KD, KI values are selected in PID control?3. What is warping?4. What is meant by discrete integrator?5. What are Z plane specifications?6. State the features of microcontroller based control system design.7. Write down the algorithm for digital PI controller design.8. What are the practical implementation of PID algorithm?9. What are the advantages of digital control algorithms?10. Mention any two sensors normally used for temperature measurement.

PART-B [5 X 16 = 80 Marks]

11. (a) Explain the Z plane specifications of control system design for various types.Or

(b) Consider the discrete feedback control system as shown in fig. The plant is described by the transfer function.

12. (a) (i)With suitable example, explain the working of continuous time version of PID controller. (8) (ii) Derive the digital version of PID control algorithm in velocity form. (8)

Or(b) (i) Find the response of the system shown in Fig to a unit impulse input. (8)

(ii) Write the Control algorithm for the given transfer function. (8)

13. (a) (i) Derive the equation of digital PID controller. (8) (ii) What is prewarping? Why is it necessary? Explain. (8)

Or(b) (i) Derive the digital algorithm for PID controller. (8)

(ii) Compare the merits and Demerits of analog and digital PID controller design. (8)

14. (a) (i) Realize the following FIR digital systems. (8)

(ii) Differentiate between recursive realization and non – recursive realization with an example. (8)

Or(b) Consider the system shown in fig. The design specification for the system require that the steady state error to a unit ramp reference input be less than 0.01 and constant disturbance we should not affect the steady state value of the output. Show that this objective is met if D(Z) is PI compensator. (16)

15. (a) With a suitable diagram, explain the workinh of microcontroller based temperature control system. (16)

Or(b) With a suitable hardware diagram, explain the working of microcontroller based motor speed control system. (16)

Prepared by Verified by Approved by

Dr.R.RaniHemamalini Dr.R.RaniHemamalini Dr.Partheeban

HOD/ECE HOD/ECE Dean (A)