Inst ToolsInst ToolsInst Tools
  • Courses
  • Automation
    • PLC
    • Control System
    • Safety System
    • Communication
    • Fire & Gas System
  • Instrumentation
    • Design
    • Pressure
    • Temperature
    • Flow
    • Level
    • Vibration
    • Analyzer
    • Control Valve
    • Switch
    • Calibration
    • Erection & Commissioning
  • Interview
    • Instrumentation
    • Electrical
    • Electronics
    • Practical
  • Q&A
    • Instrumentation
    • Control System
    • Electrical
    • Electronics
    • Analog Electronics
    • Digital Electronics
    • Power Electronics
    • Microprocessor
  • Request
Search
  • Books
  • Software
  • Projects
  • Process
  • Tools
  • Basics
  • Formula
  • Power Plant
  • Root Cause Analysis
  • Electrical Basics
  • Animation
  • Standards
  • 4-20 mA Course
  • Siemens PLC Course
Reading: Practical Process Control System Questions & Answers – 3
Share
Font ResizerAa
Inst ToolsInst Tools
Font ResizerAa
  • Courses
  • Design
  • PLC
  • Interview
  • Control System
Search
  • Courses
  • Automation
    • PLC
    • Control System
    • Safety System
    • Communication
    • Fire & Gas System
  • Instrumentation
    • Design
    • Pressure
    • Temperature
    • Flow
    • Level
    • Vibration
    • Analyzer
    • Control Valve
    • Switch
    • Calibration
    • Erection & Commissioning
  • Interview
    • Instrumentation
    • Electrical
    • Electronics
    • Practical
  • Q&A
    • Instrumentation
    • Control System
    • Electrical
    • Electronics
    • Analog Electronics
    • Digital Electronics
    • Power Electronics
    • Microprocessor
  • Request
Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Inst Tools > Blog > Practical Questions > Practical Process Control System Questions & Answers – 3

Practical Process Control System Questions & Answers – 3

Last updated: June 22, 2018 11:13 am
Editorial Staff
Practical Questions
No Comments
Share
3 Min Read
SHARE

Consider this control system, set up to maintain the temperature of a chemical reactor vessel at a constant (“setpoint”) value. The reactor’s source of heat is a steam “jacket” where hot steam is admitted through a motor-operated (M) control valve (TV) according to the temperature inside the reactor sensed by the temperature transmitter (TT):

Practical Control Systems Questions & Answers

You arrive at work one day to find the operator very upset. The last batch of product emptied from the reactor was out of spec, and the temperature displayed by the indicating controller (TIC) shows it to be 197 oF. The setpoint is set at 175 oF, and the controller is in the automatic mode as it should be.

Your first step is to look at the indication on the controller showing the output signal going to the motoractuated steam valve (TV). This output signal display (the “manipulated variable”) shows 0 %, which means “valve fully closed.”

Next, you decide to check the temperature shown at the temperature indicator (TI) located near the temperature transmitter (TT) on the reactor. There, you see a temperature indication of 195 oF.

From this information, determine what is the most likely source of the problem, and explain how you made that determination.

More Questions :

  1. Why is it important for us to know that the controller is in automatic mode? Would it make a difference if it were in manual mode instead?
  2. Explain why the first two diagnostic steps were to check the controller’s output display, then to check the TI on the reactor. What do each of these checks tell us about the nature of the problem?
  3. Suppose a fellow instrument technician were to suggest to you that the problem in this system could be a controller configured for the wrong action (e.g. direct action instead of reverse action). Do you think this is a plausible explanation for the symptoms reported here? Why or why not?

Share Your Answers via Comments

More Questions & Answers :
Practical Process Control System Questions & Answers – 1
Practical Process Control System Questions & Answers – 2
Practical Process Control System Questions & Answers – 3
Practical Process Control System Questions & Answers – 4
Practical Process Control System Questions & Answers – 5
Practical Process Control System Questions & Answers – 6
Practical Process Control System Questions & Answers – 7
Practical Process Control System Questions & Answers – 8
Practical Process Control System Questions & Answers – 9
Practical Process Control System Questions & Answers – 10
Don't Miss Our Updates
Be the first to get exclusive content straight to your email.
We promise not to spam you. You can unsubscribe at any time.
Invalid email address
You've successfully subscribed !

Continue Reading

Tank uses 3 Pressure Transmitters to Measure Level & Density
Pressure Level Transmitter Problems
Identify Problem with Oily Water Filter Instrumentation
Programmable Logic Controller (PLC) Questions and Answers – 3
Signal Strength of Guided-wave Radar Level Instrument
DP Transmitter Located 10 feet Beneath the Vessel
Share This Article
Facebook Whatsapp Whatsapp LinkedIn Copy Link
Share
Leave a Comment

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Stay Connected

128.3kFollowersLike
69.1kFollowersFollow
210kSubscribersSubscribe
38kFollowersFollow

Categories

Explore More

Displacer Level Transmitter Question & Answer
Identify Instrumentation Terms in Water Supply System
Stripper Overhead Temperature Control System
Indentify Faults in Simple Lamp Circuit including Failed Wires
Calculate the appropriate millivoltage values of a Thermocouple
Programmable Logic Controller (PLC) Questions and Answers – 16
Re-calibrate the Foxboro DP Pneumatic Transmitter
Thermocouple Terminal block Questions

Keep Learning

Pneumatic Transmitter

Pneumatic Level Transmitter Calibration Table

Inclined Water Manometer

How much Pressure is applied to Inclined Water Manometer?

Air Pressure Regulator cut-away diagram

Air Pressure Regulator Questions

strain gauge changes as it stretches and shrinks

Why Strain Gauge Resistance Changes as it Stretches and Shrinks?

water seal drum lever transmitter

Determine LRV and URV settings for the Level Transmitter

Dual-junction thermocouple circuit

Find Thermocouple Ouput Voltage

Overhead Product Pressure Control Loop

Overhead Product Pressure Control Loop

Draw the Symbols for Liquid Level Measuring Instruments

Draw the Symbols for Liquid Level Measuring Instruments

Learn More

Smart Transmitter Calibration Tutorial Part 3

Smart Transmitter Calibration Tutorial Part 3

Working of Woodward Governor 505

Overview of Woodward Governor 505

Industrial Internet of Things Projects

Top 100 Industrial Internet of Things Projects (IIoT)

thermocouple types

What is a Thermocouple ?

Question on Analytical Controller

Question on Analytical Controller

Pressure Control Loop

Pressure Control Loop Wiring Connections

Induced EMF

Magnetic Circuits

Component De-rating

Component De-rating in Control Systems

Menu

  • About
  • Privacy Policy
  • Copyright

Quick Links

  • Learn PLC
  • Helping Hand
  • Part Time Job

YouTube Subscribe

Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Welcome Back!

Sign in to your account

Username or Email Address
Password

Lost your password?