18 Questions
What is the definition of accuracy in the context of instrumentation?
The closeness of the instrument reading to the true value of the measured variable
How is accuracy determined in an instrument?
By comparing the result to a standard measurement
What factors affect the accuracy of a measured signal?
Intrinsic accuracy of the instrument, observer's accuracy, signal variation, and true value determination
What are observational errors in instrumentation related to?
Errors introduced by the observer during measurements
What type of errors are random errors in measurements?
Accumulation of small effects over multiple measurements
Why is it almost impossible to determine experimentally the true value in measurements?
Due to loading effect, lags, and mechanical problems in instruments
Which of the following is an example of an absolute instrument?
Galvanometer
If the measured value of a capacitor is 205.3 μF and its true value is 201.4 μF, what is the relative error?
1.94%
If the measured value of a power is 25.34 watts and the absolute error is -0.11 watts, what is the true value of the power?
25.45 W
If three resistors with values R1 = 47 Ω ± 4%, R2 = 65 Ω ± 4%, and R3 = 55 Ω ± 4% are connected in series, what is the magnitude of the limiting error in ohms?
167 Ω
If three resistors with values R1 = 47 Ω ± 4%, R2 = 65 Ω ± 4%, and R3 = 55 Ω ± 4% are connected in series, what is the limiting error in percentage?
7.19%
What is the absolute error if the measured value of a resistance is 10.25 Ω and the true value is 10.22 Ω?
0.03 Ω
Which of the following is NOT a type of systematic error?
Gross errors caused by human mistakes
Which of the following is the BEST way to avoid instrumental errors?
All of the above
Which of the following statements about environmental errors is NOT true?
Environmental errors are caused by human mistakes in reading or recording measurements
What is the main difference between gross errors and systematic errors?
Gross errors are caused by human mistakes, while systematic errors are caused by instrumental or environmental factors
If a measuring instrument is subjected to high temperature and humidity, what type of error is most likely to occur?
Systematic error
What is the BEST way to reduce or eliminate environmental errors in measurements?
Use the measuring instrument in the same atmospheric conditions in which it was assembled and calibrated
Explore the different types of errors in measurements including gross errors and systematic errors. Learn how these errors occur, their characteristics, and implications.
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