Controllers

Question 1

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

Answer 1

Proportional control

Question 2

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

Answer 2

proportional gain or sensitivity

Question 3

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.

Answer 3

Proportional Band or Bandwidth

Question 4

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

Answer 4

ON-OFF Controllers

Question 5

They are also sometimes called switches.

Answer 5

ON-OFF Controllers

Question 6

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

Answer 6

very high

Question 7

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

Answer 7

offset

Question 8

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

Answer 8

increasing

Question 9

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

Answer 9

Integral Control

Question 10

Integral control is also sometimes called

Answer 10

reset control or floating control

Question 11

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

Answer 11

integral time

Question 12

The reciprocal of (τ1) is called ____

Answer 12

reset time

Question 13

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

Answer 13

Derivative Control

Question 14

Derivative control is also sometimes called

Answer 14

rate action, pre-act control and
anticipatory control.

Question 15

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

Answer 15

derivative time.

Question 16

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

Answer 16

derivative kick

Question 17

_____ action is dependent on the value of the error

Answer 17

Proportional control

Question 18

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

Answer 18

Integral control

Question 19

______action is dependent on the rate of change of the error

Answer 19

Derivative control

Question 20

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.

Answer 20

Proportional-Integral-Derivative (PID) Control

Question 21

What are the characteristics of a good control system?

Answer 21

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

Question 22

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

Answer 22

Performance

Question 23

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

Answer 23

Robustness

Question 24

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 _____

Answer 24

Servo Response

Question 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.

Answer 25

Regulatory Response

Question 26

Type of controller tuning that is based on a process model
approximation

Answer 26

Model-Based Designs

Question 27

Type of controller tuning that is done after process installation and during actual process run.

Answer 27

Online Tuning

Question 28

These controller design techniques base the parameters of the PID Controllers and their
settings on the approximation to the actual system.

Answer 28

Model-Based Designs

Question 29

two commonly employed
techniques for Model-Based Designs

Answer 29

Direct Synthesis (DS) Method
Internal Model Control (IMC)

Question 30

These are controller tuning techniques which are employed after the physical installation of the equipment and the production line.

Answer 30

Online Tuning

Question 31

two commonly employed
techniques for Online Tuning

Answer 31

Ziegler–Nichols (Z-N)
Cohen–Coon(C-C)

Question 32

An alternative to Ziegler-Nichols tuning is the more conservative _____ settings

Answer 32

Tyreus-Luyben (T-L)

Question 33

transient output of the
system is also called the
_____

Answer 33

process reaction curve

Question 34

The ZN tuning technique is also
associated with

Answer 34

Closed Loop Online Tuning
Continuous Cycling Method

Question 35

The CC tuning technique on the
other hand is also known as

Answer 35

Open Loop Online Tuning
Step Test Method
Process Reaction Curve
Method

Question 36

The three most common
mathematical measurement of
performance are

Answer 36

Integral of the Absolute Error
(IAE)
Integral of the Squared Error
(ISE)
Integral of the Time-Weighted Absolute Error (ITAE)

Question 37

The ___ gives a performance
measurement that is directly
proportional to the error.

Answer 37

IAE

Question 38

The ___ penalizes larger errors and usually results to more aggressive controller settings.

Answer 38

ISE

Question 39

The ____ penalizes longer errors and usually results to less aggressive controller settings

Answer 39

ITAE