Uncertainty Analysis in Calibration Laboratories
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Questions and Answers

What describes the operation of an element at unsteady-state conditions when the process is changing?

  • Precision
  • Dynamic characteristics (correct)
  • Accuracy
  • Bias

Which term refers to the percentage of the full-scale range or reading when specifying control element accuracy?

  • Response time
  • Dynamic characteristics
  • Dead zone
  • Precision (correct)

What is the property that manufacturers may have different meanings for when specifying it?

  • Accuracy (correct)
  • Precision
  • Dynamic characteristics
  • Dead zone

Which characteristic measures the agreement among measured values and does not describe the same thing as accuracy?

<p>Precision (A)</p> Signup and view all the answers

What term describes how quickly an element reacts to a change in the measured variable or produces a 100% change in output signal due to a 100% change in input signal?

<p>Response time (A)</p> Signup and view all the answers

What may be intentionally introduced into control strategy?

<p>Bias (C)</p> Signup and view all the answers

What is the purpose of Safety Instrumented Functions (SIF) in a Safety Instrumented System (SIS)?

<p>To achieve or maintain a safe condition of the process by addressing hazardous events (A)</p> Signup and view all the answers

Why do different industries have different Safety Integrity Level (SIL) requirements for their Safety Instrumented Systems (SIS)?

<p>Due to differing levels of risk associated with different processes (B)</p> Signup and view all the answers

What is a common characteristic of sensors used in Safety Instrumented Systems (SIS) for safety shutdown?

<p>They are independent sensors dedicated to safety functions (A)</p> Signup and view all the answers

What is the role of a Logic Solver in a Safety Instrumented System (SIS)?

<p>To determine the action needed based on sensor information (C)</p> Signup and view all the answers

What are some characteristics of a Common Alarm System used in industrial processes?

<p>Loud and bright to be heard and seen by control room personnel (C)</p> Signup and view all the answers

Why should Safety Shutdown in Safety Instrumented Systems (SIS) rely on dedicated sensors instead of regulatory control sensors?

<p>To ensure independent safety functions and avoid reliance on non-safety sensors (C)</p> Signup and view all the answers

What is the Datum Line in level measurement?

<p>The starting point for making a measurement (B)</p> Signup and view all the answers

What is the purpose of applying zero suppression to a level measurement set-up?

<p>To increase the accuracy of the measurement (C)</p> Signup and view all the answers

What is the term 'deadband' referring to in pressure switches?

<p>The difference between the pressure at which the switch activates and deactivates (B)</p> Signup and view all the answers

What does 'Innage' refer to in level measurement methods?

<p>Measuring from the bottom to the liquid surface (C)</p> Signup and view all the answers

How does 'Outage' differ from 'Innage' in level measurement?

<p>It measures from the top to the liquid surface (B)</p> Signup and view all the answers

What does 'Ullage' mean in level measurement terminology?

<p>The top space above a liquid's surface in a closed container (A)</p> Signup and view all the answers

What is the purpose of uncertainty analysis in calibration laboratories?

<p>To identify factors affecting calibration accuracy (C)</p> Signup and view all the answers

What does 'uncertainty of measurement' refer to?

<p>Doubt about the validity of the measurement result (C)</p> Signup and view all the answers

Which of the following is essential for traceability in measurements?

<p>Relating measurements back to international standards (C)</p> Signup and view all the answers

What is the main outcome of a measurement according to the text?

<p>Approximation or estimate with uncertainty (B)</p> Signup and view all the answers

Which factor is critical for calibration laboratories to comply with ISO 17025 requirements?

<p>Proper uncertainty analysis (C)</p> Signup and view all the answers

Why must all measuring instruments undergo calibration?

<p>To ensure reliability and accuracy (A)</p> Signup and view all the answers

What happens when a solenoid valve is de-energized?

<p>Blocks air pressure coming from the I/P and vents all air pressure from the valve's actuating diaphragm (A)</p> Signup and view all the answers

What is the purpose of the Common Alarm System?

<p>To provide audible and visual alarms for notification purposes (C)</p> Signup and view all the answers

What is an example of an Instrument Protected Function (IPF) according to the text?

<p>Pressure Relief Valve (C)</p> Signup and view all the answers

In what scenario will a Passive Protection Layer be activated?

<p>When Active Protection Layer fails (C)</p> Signup and view all the answers

What are examples of Final Control Elements given in the text?

<p>Control Valve, damper, variable-pitch blades, motor drives (D)</p> Signup and view all the answers

What is the function of Rapture Disc mentioned in the text?

<p>Protect a pressure vessel, equipment, or system from over-pressurization (C)</p> Signup and view all the answers

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