Controllers Flashcards

1
Q

It is a type of control mode wherein the controller produces an output signal that
is directly proportional to the error

A

Proportional control

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2
Q

In a P-controller, the Kc
is the controller’s ____

A

proportional gain or sensitivity

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3
Q

is another term used instead of gain. It is defined as the error (expressed as a percentage of
range of measured variable) required to move the valve from fully closed to fully open.

A

Proportional Band or Bandwidth

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4
Q

These controllers that instruct either use a fully open or fully closed valve

A

ON-OFF Controllers

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5
Q

They are also sometimes called switches.

A

ON-OFF Controllers

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6
Q

On-Off controllers are simulated when the Kc values are ___

A

very high

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7
Q

employing proportional control
only produces _____ in the steady state response of the control system

A

offset

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8
Q

Offset is decreased by ____ Kc however it makes the response sluggish and more oscillatory.

A

increasing

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9
Q

It is a type of control mode wherein the controller produces an output signal that is directly proportional to the integral of the error

A

Integral Control

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10
Q

Integral control is also sometimes called

A

reset control or floating control

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11
Q

In an integral mode of control, the main parameter (τ1) is calIed the ____

A

integral time

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12
Q

The reciprocal of (τ1) is called ____

A

reset time

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13
Q

It is a type of control mode wherein the controller produces an output signal that
is directly proportional to the derivative of the error

A

Derivative Control

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14
Q

Derivative control is also sometimes called

A

rate action, pre-act control and
anticipatory control.

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15
Q

The main parameter in derivative control is τd which is called the ____

A

derivative time.

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16
Q

A phenomenon of producing
a very aggressive control action due to a sudden change in the error

A

derivative kick

17
Q

_____ action is dependent on the value of the error

A

Proportional control

18
Q

_____ action is dependent on the length of time of the error.

A

Integral control

19
Q

______action is dependent on the rate of change of the error

A

Derivative control

20
Q

It is a type of control mode herein the controller produces an output signal that is directly
proportional to the error, its duration and its rate of change.

A

Proportional-Integral-Derivative (PID) Control

21
Q

What are the characteristics of a good control system?

A

Stable closed-loop system
Good disturbance rejection
Good set-point tracking
Elimination of steady-state
offset
Avoidance of excessive control
action
Robust control system

22
Q

is the characteristic of a control
system to provide rapid and
smooth responses to disturbance and set point
changes with little, if any,
oscillation.

A

Performance

23
Q

is the characteristic of a control system to provide satisfactory
performance for a wide range
of process conditions and a
reasonable degree of model
inaccuracy

A

Robustness

24
Q

It is the output of a control system for a set point change. An excellent set point tracking for a system would mean an acceptable _____

A

Servo Response

25
is the output of a system for disturbances. As much as possible, disturbance rejection means the system reverts back to its original steady state response after the introduction of an unsustained disturbance.
Regulatory Response
26
Type of controller tuning that is based on a process model approximation
Model-Based Designs
27
Type of controller tuning that is done after process installation and during actual process run.
Online Tuning
28
These controller design techniques base the parameters of the PID Controllers and their settings on the approximation to the actual system.
Model-Based Designs
29
two commonly employed techniques for Model-Based Designs
Direct Synthesis (DS) Method Internal Model Control (IMC)
30
These are controller tuning techniques which are employed after the physical installation of the equipment and the production line.
Online Tuning
31
two commonly employed techniques for Online Tuning
Ziegler–Nichols (Z-N) Cohen–Coon(C-C)
32
An alternative to Ziegler-Nichols tuning is the more conservative _____ settings
Tyreus-Luyben (T-L)
33
transient output of the system is also called the _____
process reaction curve
34
The ZN tuning technique is also associated with
Closed Loop Online Tuning Continuous Cycling Method
35
The CC tuning technique on the other hand is also known as
Open Loop Online Tuning Step Test Method Process Reaction Curve Method
36
The three most common mathematical measurement of performance are
Integral of the Absolute Error (IAE) Integral of the Squared Error (ISE) Integral of the Time-Weighted Absolute Error (ITAE)
37
The ___ gives a performance measurement that is directly proportional to the error.
IAE
38
The ___ penalizes larger errors and usually results to more aggressive controller settings.
ISE
39
The ____ penalizes longer errors and usually results to less aggressive controller settings
ITAE