WorksheetsAPC System Quiz
Total questions: 15
Worksheet time: 5mins
Which variable must be checked daily for all heaters running through the APC system?
Feedback Variable (FV)
Setpoint Variable (SV)
Manipulated Variable (MV)
Controlled Variable (CV)
What happens when the MV moves up and there is a positive gain?
MV value decreases
No change in CV value
CV value increases
CV value decreases
What is the purpose of clicking on 'Control Objective' in the APC system?
To reset the system
To change the setpoint
To open a new window displaying diagnostic information
To log out of the system
How does the APC controller deal with constraints?
By shutting down the system
By increasing the MV
By applying a strategy to keep the CV within allowable range
By ignoring them
What is the first stage of IQ Validation related to?
Flow rate adjustments
Pressure limits
Temperature control
Conditions of the effluent analyzer
What is a consequence of insufficient airflow in the system?
Lower fuel consumption
Increased combustion efficiency
Higher temperature
Incomplete combustion
What action is required when CO measurement is high?
Increase the high limit for PPI1X15
Open the damper
Reduce the feed rate
Decrease the high limit for PPI1X16A
What does economic optimization in ethylene furnaces aim to achieve?
Maximize emissions
Reduce equipment usage
Minimize feed rates only
Maximize profit while staying within safety constraints
What is the effect of too much excess air in the furnace?
Higher temperature
Lower emissions
Increased efficiency
Energy wasted
What is the overall objective of the APC controller in the furnace?
To reduce emissions only
To improve and optimize ethylene production
To maintain equipment
To minimize costs only
What must the operator ensure regarding Ethane Conversion and Ethylene Yield?
They are set to zero
They are ignored
They are minimized
They are always optimized
What happens if the conversion limits are not adjusted?
Production will decrease
Production will increase
No effect on production
Emissions will decrease
What is a challenge when increasing ethylene production?
Increased acetylene levels
Decreased feed rates
Lower temperatures
Reduced efficiency
What is the consequence of a negative gain in the APC system?
MV value increases
No change in CV value
CV value decreases
CV value increases
What is the purpose of the Dynamic Matrix Control in the APC controller?
To shut down the system
To monitor emissions
To define relationships between MVs and CVs
To adjust feed rates
