65 3.1 CONTROL SYSTEMS L T P 5 - 2 RATIONALE It is pre-requisite for the students to know the various total plant controls in the process industry. An automatic control system saves manpower, reduces cost of production, increases the accuracy of the finished product and helps in mass production so that the knowledge of this subject is required to have deeper grasp of the control environment/techniques as need to be studied in the subjects e.g. process control, process instrumentation. DETAILED CONTENTS Introduction (20 hrs) Basic elements of control system, open loop control system, closed loop control system, control system terminology, manually controlled closed loop systems, automatic controlled closed loop systems, basic elements of a servo mechanism, Examples of automatic control systems, use of equivalent systems for system analysis, linear systems, non-linear systems, control system examples from chemical systems, mechanical systems, electrical systems, introduction to laplace transform. Transfer function analysis of ac and dc servomotors synchros, steppermotor, amplyedyne. ac position control system, magnetic amplifier. (14 hrs) Control system representation (16 hrs) Transfer function, block diagram, reduction of block diagram, problems on block diagram, Mason’s formula signal flow graph Time Response Analysis (16 hrs) Standard test signals, time response of first and second-order system, time constant, time response of second order system, time response specifications, steady-state errors and error constants, problems in first and second order system. Stability (14 hrs) Routh Hurwitz Criterion, Root Locus, Bode Plotting using semi log graph paper 66 LIST OF PRACTICALS Study of characterist ...