The Precision of an instrument is: ____ a. the closeness with which its reading

Question

The Precision of an instrument is: ____ a. the closeness with which its reading approaches the true value of the variable being measured. b. reproducibility of the measurements. c. is the ratio of output signal or response of the instrument to a change in input or measured variable. d. the smallest change in measured value to which the instrument will respond. The Accuracy of an instrument is: ______. a. the closeness with which its reading approaches the true value of the variable being measured b. reproducibility of the measurements c. is the ratio of output signal or response of the instrument to a change in input or measured variable d. the smallest change in measured value to which the instrument will respond. A pressure gauge ranges from 0-50 psi, the worst case spread in readings is +/-4 psi. What is the % FSD accuracy? a. 4% b. 8% c.8.7% d. Not enough information given What is the MAIN difference between accuracy and absolute accuracy? a. Absolute accuracy is more accurate b. Accuracy is measured in % while absolute accuracy is not c. Absolute accuracy is more precise d. Absolute accuracy is not as important A thermometer whose scale goes from -40 degree C to 100 degree C, has a span of: a. 140 degree C b. 100 degree c. 40 degree C to 140 degree C d. 60 degree C

Explanation / Answer

Precision:- it indicates the degree of closeness between the measured values.

For a good instrument ,a high precision is preferred when the measured values are very close

The precision is the measurement of reproducibility of repeatability.

Accuracy:- it is the degree of closeness of measured value to true value i.e conformity of truth

5Q. Span= Maximum - minimum=100-(-40)=140

4Q.% Fsd accuracy= Error/Fsd×100

=4/50×100=8%

Absolute Accuracy:- when accuracy measured interns of error is called absolute Accuracy error.

It is the error expressed with respect to full scale deflection

It is expressed by manufacturer, it is constant for meter

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