What is a measurement of the chemical or physical properties of a substance?
A) Remote
B) Process variable
C) Analytical variable
D) Transducer
Answer: C
Explanation: A) Incorrect. A remote is instrumentation that is located away from the process (e.g., in a control room) and is controlled by the DCS or other panel board mounted controller.
B) Incorrect. A process variable is a varying operational condition that is associated with a processing operation such as temperature, pressure, flow rate, level, and composition.
C) Correct. An analytical variable is a measurement of the chemical or physical properties of a substance.
D) Incorrect. A transducer is the control loop component that converts one instrumentation signal type to another type (e.g., electronic to pneumatic).
You might also like to view...
A part made from annealed AISI 1018 steel undergoes a 20 percent cold-work operation. (a) Obtain the yield strength and ultimate strength before and after the cold-work operation. Determine the percent increase in each strength. (b) Determine the ratios of ultimate strength to yield strength before and after the cold-work operation. What does the result indicate about the change of ductility of the part?
What will be an ideal response?
When a suction line filter/drier is added to the refrigerant circuit, the additional amount of refrigerant required is ignored.
Answer the following statement true (T) or false (F)
How often should a renewable media, pleated surface be changed?
What will be an ideal response?
A bus that will terminate the bus cycle unless a signal indicates that it should insert wait states is ________
A) asynchronous B) quasi-synchronous C) semi-synchronous D) synchronous