WorksheetsProcess control quiz
Total questions: 15
Worksheet time: 8mins
Why is process control essential in modern chemical plants?
Safety
Profitability
Operability
All of the above
Which of the following correctly represent the components of a control system?
Thermocouple, displacer device, heating coil
Measuring element, thermometer, pressure gauge
Process, measuring element, controller and final control element
Process, measuring element, amplifier and final control element
Which statement best describes the fundamental function of a process control system?
To eliminate all disturbances entering a chemical process
To maximize the production rate under all operating conditions
To maintain important process variables near their desired values despite disturbances
To replace operators by fully automating all plant operations
What is the main function of a temperature sensor?
To measure the temperature of a process
To adjust the flow of a process
To perform logical operations and control equipment
To provide feedback control
What is the primary function of a temperature controller in a process control system?
To directly measure the process temperature
To compare the measured temperature with the set point and determine the appropriate control action
To directly regulate the flow of heating or cooling fluid
To transmit the temperature measurement from the sensor to the control room
What is the role of a control valve in a process control system?
To adjust the flow rate of a fluid in the process
To measure the temperature of the process
To monitor the pressure in the process
All of the above
Which of the following acts as a final control element?
PI controller
PID controller
Automatic pneumatic control valve
Thermocouple
Which of the followings correctly represents the measured variable?
Heat
Temperature of the vessel
Inlet temperature of the steam
Coolant temperature
The set of devices used to measure, record, and control industrial processes.
Primary sensing element
Indicators
Transmitters
Process instrumentation
Which statement best describes a process control system?
system to keep the parameters at zero value
Maintains selected process variables near their desired values despite disturbances
system to keep the parameter at highest value
Eliminates all disturbances from a process
A stirred tank must be maintained at 80°C. A thermocouple suddenly measures 85°C.
What should the temperature-control system do?
Increase steam flow
Decrease steam flow
Increase the temperature set point
Ignore the change
A heat exchanger maintains its outlet temperature by changing the cooling-water flow rate. The feed temperature suddenly increases.
The feed-temperature change is a:
Controlled variable
Manipulated variable
Disturbance
Set point
A reactor temperature is maintained at 350 K by adjusting cooling-water flow through its jacket.
Which is the manipulated variable?
Reactor temperature
Reactor temperature set point
Feed temperature
Cooling water flow rate
On a P&ID, you see:
TT-101 → TIC-101 → TV-101
What does this control loop most likely represent?
Temperature measurement, temperature control, and manipulation through a valve
Pressure measurement and pressure control
Flow measurement without automatic control
Level measurement and alarm system
A refinery laboratory measures product quality only once every few hours. An AI model uses temperature, pressure, flow, and historical laboratory data to estimate product quality continuously.
What role is the AI model primarily performing?
Control valve
Soft sensor / virtual analyzer
Physical sensor
Final control element
