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