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Feedback and Control Systems > Chapter 1 PPT > Flashcards

Chapter 1 PPT Flashcards

1
Q

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

A

Automatic Control

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2
Q

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

A

Automatic Control System

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3
Q

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

A

Automatic Control

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4
Q

An automatic control system has two process variables associated with it

A

Controlled variable and manipulated variable

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5
Q

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

A

Controlled variable

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6
Q

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.

A

Manipulated variable

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7
Q

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

A

Measurement, Comparison, Computation, Correction

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8
Q

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

A

System

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9
Q

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

A

Plant

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10
Q

Any operation to be controlled

A

Process

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11
Q

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

A

Input

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12
Q

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

A

Output

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13
Q

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

A

Controller

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14
Q

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

A

Disturbances

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15
Q

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

A
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16
Q

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

A

Internal Disturbance

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17
Q

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

A

External Disturbance

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18
Q

Classification of Control Systems

A

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

19
Q

A control system in which output varies linearly with the input

A

Linear Control System

20
Q

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

A

Time invariant control system

21
Q

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

A

Time varying control system

22
Q

All system variables are function of a continuous time t

A

Continuous data control system

23
Q

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

A

Discrete time control system

24
Q

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

A

Deterministic Control System

25
Q

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

A

Open-loop control system

26
Q

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.

A

Open-loop control system

27
Q

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

A

Feedback control system

28
Q

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 ___

A

feedback signal

29
Q

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

A

error

30
Q

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

A

Controller

31
Q

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.

A

Controller

32
Q

Classification of Industrial Controllers

A

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

33
Q

The most elementary controller mode

A

Two-position or on-off controller mode

34
Q

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

A

Proportional controller

35
Q

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

A

Integral controllers

36
Q

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

A

Derivative controller

37
Q

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

A

Proportional + Integral controller

38
Q

The series combination of proportional and derivative control mode

A

Proportional + Derivative Controllers

39
Q

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

A

PID control mode

40
Q

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

A

Proportional Control

41
Q

As the gain increases, the ___ decreases

A

offset

42
Q

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

A

decreases

43
Q

It speeds up the removal of the offset

A

Derivative action

Feedback and Control Systems (2 decks)

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