Process Dynamics and Control Test Questions with Correct Answers Fully Solved
Process - Answers The conversion of feed materials to products using chemical and physical operations.
In practice, the term _______ tends to be used for both the processing operation and the processing
equipment.
This is the _____ of which a variable is being controlled.
Steady-state condition - Answers It refers to the time where the variable of interest doesn't change.
Unsteady-state condition - Answers It refers to the time where the variable of interest changes over
time.
Process Dynamics - Answers The term refers to unsteady-state (transient) process behavior.
Transient operation occurs during important situations such as startups and shutdowns, unusual process
disturbances, and planned transitions from one product grade to another.
Control systems are needed to handle such changes in the process.
Process Control - Answers The study and application of automatic control in the field of chemical
engineering.
The primary objective is to maintain a process at the desired operating conditions safely and efficiently,
while satisfying environmental and product quality requirements. (Seborg, 2004)
This refers to the methods that are used to control process variables when manufacturing a product.
Controlled (Measured) Variable - Answers The process variables that are controlled. The desired value of
a ________ is referred to as its set point.
Exit Temperature
Manipulated Variable - Answers The process variables that can be adjusted in order to keep the
controlled variables at or near their set points. Typically, the ________ are flowrates.
, Cooling Water Flowrate
Disturbance Variable - Answers Process variables that affect the controlled variables but cannot be
manipulated. _______ generally are related to changes in the operating environment of the process.
Inlet Temperatures
Process Fluid Flowrate
Continuous Stirred Tank Reactor - Answers What is CSTR?
It is also known as the back-mix reactor.
Feedback Control - Answers Corrective action occurs regardless of the source of the disturbance.
The dominant process control strategy.
Reduces the sensitivity of the controlled variable to unmeasured disturbances and process changes.
Feedforward Control - Answers Corrective action is taken before the controlled variable deviates from
the setpoint.
The disturbance variable is measured, but the controlled variable is not.
Measurement and Actuation - Answers Measurement devices (e.g sensors and transmitters) and
actuation equipment (e.g. control valves).
Safety and Environmental / Equipment Protection - Answers This level plays a critical role by ensuring
that the process is operating safely and satisfies environmental regulations.
Process safety relies on the principle of multiple protection layers.
Safety equipment operates independently of the regular instrumentation used for regulatory control.
RA 8749 - Answers Philippine Clean Air Act of 1999
Process - Answers The conversion of feed materials to products using chemical and physical operations.
In practice, the term _______ tends to be used for both the processing operation and the processing
equipment.
This is the _____ of which a variable is being controlled.
Steady-state condition - Answers It refers to the time where the variable of interest doesn't change.
Unsteady-state condition - Answers It refers to the time where the variable of interest changes over
time.
Process Dynamics - Answers The term refers to unsteady-state (transient) process behavior.
Transient operation occurs during important situations such as startups and shutdowns, unusual process
disturbances, and planned transitions from one product grade to another.
Control systems are needed to handle such changes in the process.
Process Control - Answers The study and application of automatic control in the field of chemical
engineering.
The primary objective is to maintain a process at the desired operating conditions safely and efficiently,
while satisfying environmental and product quality requirements. (Seborg, 2004)
This refers to the methods that are used to control process variables when manufacturing a product.
Controlled (Measured) Variable - Answers The process variables that are controlled. The desired value of
a ________ is referred to as its set point.
Exit Temperature
Manipulated Variable - Answers The process variables that can be adjusted in order to keep the
controlled variables at or near their set points. Typically, the ________ are flowrates.
, Cooling Water Flowrate
Disturbance Variable - Answers Process variables that affect the controlled variables but cannot be
manipulated. _______ generally are related to changes in the operating environment of the process.
Inlet Temperatures
Process Fluid Flowrate
Continuous Stirred Tank Reactor - Answers What is CSTR?
It is also known as the back-mix reactor.
Feedback Control - Answers Corrective action occurs regardless of the source of the disturbance.
The dominant process control strategy.
Reduces the sensitivity of the controlled variable to unmeasured disturbances and process changes.
Feedforward Control - Answers Corrective action is taken before the controlled variable deviates from
the setpoint.
The disturbance variable is measured, but the controlled variable is not.
Measurement and Actuation - Answers Measurement devices (e.g sensors and transmitters) and
actuation equipment (e.g. control valves).
Safety and Environmental / Equipment Protection - Answers This level plays a critical role by ensuring
that the process is operating safely and satisfies environmental regulations.
Process safety relies on the principle of multiple protection layers.
Safety equipment operates independently of the regular instrumentation used for regulatory control.
RA 8749 - Answers Philippine Clean Air Act of 1999
