PROCESS DYNAMICS AND CONTROL, 4TH
EDITION BY SEBORG — COMPLETE SOLUTION
MANUAL PRACTICE EXAMINATION — STUDY
GUIDE | LATEST UPDATE 2026/2027 | ACTUAL
EXAM | PRACTICE QUESTIONS AND ANSWERS |
EXAM REVIEW | 100% CORRECT ANSWERS |
VERIFIED SOLUTIONS
Course/Program: Process Dynamics and Control
Field of Study: Chemical Engineering, Process Systems Engineering, Control
Theory, Industrial Automation
Level: Undergraduate, Graduate, Professional Engineering (PE) Chemical, Process
Control Certification
Edition: 2026–2027
Table of Contents
1. Introduction to Process Control
2. Dynamic Modeling of Processes
3. Laplace Transforms and Transfer Functions
4. Dynamic Behavior of First-Order Systems
5. Dynamic Behavior of Second-Order Systems
6. Feedback Control Systems
7. Stability Analysis of Control Systems
8. Controller Tuning and Design
9. Frequency Response Analysis
10.Advanced Control Strategies and Applications
, 1. Introduction to Process Control
2.
Which of the following best defines a controlled variable in a process
control system?
A) The variable that is manipulated to achieve control
B) The variable that is measured and maintained at a desired set point
C) The variable that causes disturbances in the process
D) The variable that indicates the performance of the controller
Correct Answer: B
A controlled variable is the process output that is measured and
compared to a set point. The manipulated variable is adjusted by the
controller to keep the controlled variable at the set point. Disturbance
variables affect the process but are not directly controlled.
2.
What is the primary purpose of a feedback control loop?
A) To eliminate all process disturbances
B) To maintain the controlled variable at a desired set point despite
disturbances
C) To maximize process throughput regardless of quality
D) To replace human operators entirely
Correct Answer: B
Feedback control continuously compares the controlled variable to the
set point and adjusts the manipulated variable to minimize the error. It
cannot eliminate all disturbances but reduces their impact. It supports
operators rather than replacing them.
, 3.
In a heat exchanger control system, the outlet temperature is the
controlled variable, and the steam flow rate is the manipulated variable.
What is the disturbance variable?
A) Outlet temperature
B) Steam flow rate
C) Inlet process fluid temperature
D) Set point temperature
Correct Answer: C
Inlet process fluid temperature affects the outlet temperature and is
not manipulated; it is a disturbance. The outlet temperature is
controlled, steam flow is manipulated, and the set point is the desired
value.
4.
Which of the following is an example of a regulatory control objective?
A) Changing the set point to increase production rate
B) Maintaining reactor temperature constant despite varying feed
composition
C) Starting up a plant from shutdown
D) Optimizing product yield by adjusting multiple variables
Correct Answer: B
Regulatory control maintains variables at fixed set points despite
disturbances. Changing set points is servo control; startup is batch or
sequential control; optimization is supervisory control.
5.
, A process is described as "self-regulating." What does this imply?
A) The process requires continuous external intervention to remain
stable
B) The process naturally reaches a new steady state after a disturbance
without external control
C) The process is inherently unstable
D) The process has no time delay
Correct Answer: B
A self-regulating process returns to a steady state on its own after a
disturbance, though the new steady state may be different. Non-self-
regulating processes drift away without control.
6.
Which of the following is a characteristic of a continuous process?
A) Products are produced in discrete batches
B) Raw materials are fed continuously and products are removed
continuously
C) The process operates only during specific shifts
D) The process has no instrumentation
Correct Answer: B
Continuous processes operate with continuous feed and product
removal, unlike batch or semi-batch processes. They are often run 24/7
and are highly instrumented.
7.
In a feedback control loop, the difference between the set point and the
measured controlled variable is called the:
A) Bias
EDITION BY SEBORG — COMPLETE SOLUTION
MANUAL PRACTICE EXAMINATION — STUDY
GUIDE | LATEST UPDATE 2026/2027 | ACTUAL
EXAM | PRACTICE QUESTIONS AND ANSWERS |
EXAM REVIEW | 100% CORRECT ANSWERS |
VERIFIED SOLUTIONS
Course/Program: Process Dynamics and Control
Field of Study: Chemical Engineering, Process Systems Engineering, Control
Theory, Industrial Automation
Level: Undergraduate, Graduate, Professional Engineering (PE) Chemical, Process
Control Certification
Edition: 2026–2027
Table of Contents
1. Introduction to Process Control
2. Dynamic Modeling of Processes
3. Laplace Transforms and Transfer Functions
4. Dynamic Behavior of First-Order Systems
5. Dynamic Behavior of Second-Order Systems
6. Feedback Control Systems
7. Stability Analysis of Control Systems
8. Controller Tuning and Design
9. Frequency Response Analysis
10.Advanced Control Strategies and Applications
, 1. Introduction to Process Control
2.
Which of the following best defines a controlled variable in a process
control system?
A) The variable that is manipulated to achieve control
B) The variable that is measured and maintained at a desired set point
C) The variable that causes disturbances in the process
D) The variable that indicates the performance of the controller
Correct Answer: B
A controlled variable is the process output that is measured and
compared to a set point. The manipulated variable is adjusted by the
controller to keep the controlled variable at the set point. Disturbance
variables affect the process but are not directly controlled.
2.
What is the primary purpose of a feedback control loop?
A) To eliminate all process disturbances
B) To maintain the controlled variable at a desired set point despite
disturbances
C) To maximize process throughput regardless of quality
D) To replace human operators entirely
Correct Answer: B
Feedback control continuously compares the controlled variable to the
set point and adjusts the manipulated variable to minimize the error. It
cannot eliminate all disturbances but reduces their impact. It supports
operators rather than replacing them.
, 3.
In a heat exchanger control system, the outlet temperature is the
controlled variable, and the steam flow rate is the manipulated variable.
What is the disturbance variable?
A) Outlet temperature
B) Steam flow rate
C) Inlet process fluid temperature
D) Set point temperature
Correct Answer: C
Inlet process fluid temperature affects the outlet temperature and is
not manipulated; it is a disturbance. The outlet temperature is
controlled, steam flow is manipulated, and the set point is the desired
value.
4.
Which of the following is an example of a regulatory control objective?
A) Changing the set point to increase production rate
B) Maintaining reactor temperature constant despite varying feed
composition
C) Starting up a plant from shutdown
D) Optimizing product yield by adjusting multiple variables
Correct Answer: B
Regulatory control maintains variables at fixed set points despite
disturbances. Changing set points is servo control; startup is batch or
sequential control; optimization is supervisory control.
5.
, A process is described as "self-regulating." What does this imply?
A) The process requires continuous external intervention to remain
stable
B) The process naturally reaches a new steady state after a disturbance
without external control
C) The process is inherently unstable
D) The process has no time delay
Correct Answer: B
A self-regulating process returns to a steady state on its own after a
disturbance, though the new steady state may be different. Non-self-
regulating processes drift away without control.
6.
Which of the following is a characteristic of a continuous process?
A) Products are produced in discrete batches
B) Raw materials are fed continuously and products are removed
continuously
C) The process operates only during specific shifts
D) The process has no instrumentation
Correct Answer: B
Continuous processes operate with continuous feed and product
removal, unlike batch or semi-batch processes. They are often run 24/7
and are highly instrumented.
7.
In a feedback control loop, the difference between the set point and the
measured controlled variable is called the:
A) Bias
