Chapter 1 PPT

Question 1

It helps in attaining optimal performance of dynamic systems, improving productivity, relieving the drudgery of many routing repetitive manual operations

Answer 1

Automatic Control

Question 2

It is a pre-set closed-loop control system that requires no operator (human) action.

Answer 2

Automatic Control System

Question 3

It uses application of mechanisms to the operation and regulation of processes without continuous direct human intervention

Answer 3

Automatic Control

Question 4

An automatic control system has two process variables associated with it

Answer 4

Controlled variable and manipulated variable

Question 5

It is a process variable that is maintained at a specified value or within a specified range

Answer 5

Controlled variable

Question 6

It is a process variable that is acted on by the control system to maintain the controlled variable at the specified value or within the specified range.

Answer 6

Manipulated variable

Question 7

In any automatic control system, the four basic functions that occur are:

Answer 7

Measurement, Comparison, Computation, Correction

Question 8

It is a combination or an arrangement of different physical components which act together as an entire unit to achieve certain objective.

Answer 8

System

Question 9

The portion of a system which is to be controlled or regulated

Answer 9

Plant

Question 10

Any operation to be controlled

Answer 10

Process

Question 11

It is an applied signal or an excitation signal applied to control system from an external energy source in order to produce a specified output

Answer 11

Input

Question 12

It is the particular signal of interest or the actual response obtained from a control system when input is applied to it

Answer 12

Output

Question 13

The element of the system itself or external tot the system which controls the plant or the process

Answer 13

Controller

Question 14

It is a signal which tends to adversely affect the value of the output of a system.

Answer 14

Disturbances

Question 15

Undesirable and unavoidable effects beyond our control, generated from outside process-environment and from within

Question 16

If such disturbance is generated within the system itself, it is called as

Answer 16

Internal Disturbance

Question 17

The disturbance generated outside the system acting as an extra input to the system in addition to its normal input, affecting the output adversely is called as an

Answer 17

External Disturbance

Question 18

Classification of Control Systems

Answer 18

Natural Control System, Manmade Control System, Manual Control System, Manual Control System, Automatic Control System, Open-Loop Control System, Closed-Loop Control System, Linear vs Nonlinear Control System, Time invariant vs Time Variant, Continuous Data vs Discrete Data System, Deterministic vs Stochastic Control System

Question 19

A control system in which output varies linearly with the input

Answer 19

Linear Control System

Question 20

When the characteristics of the system do not depend upon time itself

Answer 20

Time invariant control system

Question 21

It is a system in which one or more parameters vary with time

Answer 21

Time varying control system

Question 22

All system variables are function of a continuous time t

Answer 22

Continuous data control system

Question 23

It involves one or more variables that are known only at discrete time intervals

Answer 23

Discrete time control system

Question 24

A control system is ____ if the response to input is predictable and repeatable

Answer 24

Deterministic Control System

Question 25

Any physical system which does not automatically correct for variation in its output

Answer 25

Open-loop control system

Question 26

In this system, output is dependent on input but controlling action or input is totally independent of the output or changes in output of the system.

Answer 26

Open-loop control system

Question 27

A system that maintains a prescribed relationship between the output and the reference input by comparing them and using the difference as a means of control is called a

Answer 27

Feedback control system

Question 28

The part of output, which is to be decided by feedback element is fed back to the reference input. The signal which is output of feedback element is called ___

Answer 28

feedback signal

Question 29

The deviation of the actual output from its desired value is called an ____

Answer 29

error

Question 30

It is an element which accepts the error in some form and decides the proper corrective action

Answer 30

Controller

Question 31

It is the heart of the control system. The accuracy of the entire system depends on how sensitive it is to the error detected and how it is manipulating such an error.

Answer 31

Controller

Question 32

Classification of Industrial Controllers

Answer 32

Two-position or on-off controllers, Proportional Controllers, Integral Controllers, Proportional-plus-integral controllers, proportional-plus-derivative controllers, proportional-plus-integral-plus-derivative controllers

Question 33

The most elementary controller mode

Answer 33

Two-position or on-off controller mode

Question 34

In this control mode, the output of the controller is simple proportional to the error

Answer 34

Proportional controller

Question 35

A control mode used in control systems which is based on the history of the errors

Answer 35

Integral controllers

Question 36

The controller produces a control action that is proportional to the rate at which the error is changing

Answer 36

Derivative controller

Question 37

This is a composit control mode obtained by combining the proportional mode and the integral mode

Answer 37

Proportional + Integral controller

Question 38

The series combination of proportional and derivative control mode

Answer 38

Proportional + Derivative Controllers

Question 39

The composite controllers including the combination of the proportional, integral and derivative control

Answer 39

PID control mode

Question 40

It will always result in an offset between measured value and desired value and for every load there will be a different steady state water level

Answer 40

Proportional Control

Question 41

As the gain increases, the ___ decreases

Answer 41

offset

Question 42

As the gain increases, the stability ___ until the system becomes unstable

Answer 42

decreases

Question 43

It speeds up the removal of the offset

Answer 43

Derivative action