Quiz 15 - Ch. 27 Instrumentation
What is a varying operational condition that is associated with a processing operation such as temperature, pressure, flow rate, level, and composition? (Mark all that apply)
Process variable Analytical variable
What is the difference between the set point and the current process variable value called?
Error
What system uses light frequency signals and is gaining popularity in industry use?
Fiber optics
Which of the following is an example of instrumentation that could be programmed to begin each step in the process upon completion of the previous one?
Regeneration of a catalyst bed Filter backwash Dryer regeneration
What uses air pressure, or a gas such as nitrogen, as a power source traveling through copper or stainless tubes?
Pneumatic instruments
What is the most common pressure measurement found in the US process industry?
Pounds per square inch (psi)
What type of signal is a continuously variable representation of a process variable?
Analog signal
What is a measurement of the chemical or physical properties of a substance?
Analytical variable
What type of control element can only be on or off?
Discrete
What is a possible equipment impact of adjusting leaking control valve packing? Mark all that apply.
May cause the valve to hang or stick Valve may not open, close, or operate properly
What common component of a DCS system is a data highway that connects the systems?
Network
Which of the following is a common flow-sensing element that creates a difference in pressure that can be measured by a D/P cell?
Orifice plates
Which of the following is an element in direct contact with the process variable to be measured that senses a change and provides a signal to the transmitter?
Sensor
What common component of a DCS system are computers accessed by engineers and management at the programming level to monitor production targets?
Supervisory computers
Which of the following is a temperature-sensing instrument?
Thermistors
What component of process control instrumentation systems converts one instrumentation signal type into another type?
Transducer
Which of the following is a symbol for remotely mounted instrumentation?
circle with dots
