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Questions and Answers
What does the presence of measurement uncertainty mean?
What does the presence of measurement uncertainty mean?
- The measuring instrument is free from errors
- The measuring instrument gives a value with no deviation
- The measuring instrument always gives an exact value of the measured quantity
- The measuring instrument may give a deviated value of the measured quantity (correct)
Which type of error consistently occurs on one side of the correct reading in a measurement system?
Which type of error consistently occurs on one side of the correct reading in a measurement system?
- Random errors
- Environmental errors
- Measurement errors
- Systematic errors (correct)
What can be a source of random errors in measurements taken by human observation of an analog meter?
What can be a source of random errors in measurements taken by human observation of an analog meter?
- The effect of environmental changes
- System disturbance during measurement
- Electrical noise (correct)
- Bent meter needles
Which of the following is NOT a major source of systematic errors in a measurement system?
Which of the following is NOT a major source of systematic errors in a measurement system?
How can measurement errors be minimized?
How can measurement errors be minimized?
Which type of error in a measurement system consistently occurs on one side of the correct reading?
Which type of error in a measurement system consistently occurs on one side of the correct reading?
What describes perturbations of the measurement either side of the true value caused by random and unpredictable effects?
What describes perturbations of the measurement either side of the true value caused by random and unpredictable effects?
Which of the following is a major source of systematic errors in a measurement system?
Which of the following is a major source of systematic errors in a measurement system?
What is the effect of measurement uncertainty on the output of a measuring instrument?
What is the effect of measurement uncertainty on the output of a measuring instrument?
What can be a source of random errors in measurements taken by human observation of an analog meter?
What can be a source of random errors in measurements taken by human observation of an analog meter?
What is the main characteristic of systematic errors in a measurement system?
What is the main characteristic of systematic errors in a measurement system?
Which of the following is NOT a major source of systematic errors in a measurement system?
Which of the following is NOT a major source of systematic errors in a measurement system?
What are random errors in a measurement system caused by?
What are random errors in a measurement system caused by?
What can be a source of random errors in measurements taken by human observation of an analog meter?
What can be a source of random errors in measurements taken by human observation of an analog meter?
How can errors in measurement be minimized?
How can errors in measurement be minimized?
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Study Notes
Measurement Errors and Uncertainty
- Presence of measurement uncertainty means that the measured value is not exact and has a range of possible values.
- Systematic errors consistently occur on one side of the correct reading in a measurement system.
Sources of Errors
- Random errors in measurements taken by human observation of an analog meter can be caused by: • Parallax error (misalignment of eyes with meter scale) • Personal bias • Limited resolution of the meter
- Random errors in a measurement system are caused by: • Random and unpredictable effects • Small changes in environmental conditions • Inherent limitations of the measurement instrument
Systematic Errors
- A major source of systematic errors in a measurement system is: • Instrumental errors (e.g., faulty or miscalibrated instruments) • Human error (e.g., incorrect data recording) • Environmental errors (e.g., temperature fluctuations)
- NOT a major source of systematic errors is: • Random fluctuations
Characteristics of Errors
- Main characteristic of systematic errors is that they consistently occur on one side of the correct reading.
- Description of perturbations of the measurement either side of the true value caused by random and unpredictable effects is called random error.
Minimizing Errors
- Measurement errors can be minimized by: • Using high-quality instruments • Calibrating instruments regularly • Taking multiple readings and averaging them • Improving measurement techniques • Reducing environmental interference
Effect of Measurement Uncertainty
- Measurement uncertainty affects the output of a measuring instrument by introducing a range of possible values rather than a single exact value.
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