16 Instrumentation and Control Systems A measurement system which has a lack of
ID: 2249125 • Letter: 1
Question
16 Instrumentation and Control Systems A measurement system which has a lack of where there could be: Random fluctuations in the values given by repeated ments of the same variable i) Flucthuations in the values obtained by repeating over a number of samples. Which option BEST describes the two statements? 2.1 Int A (i) T (ii) T B OT (i)F C OF (i) T elements of a measurement system 6 List and explain the functional 7 Explain the terms (a) reliability and (b) repeatability when appliod 8 Explain what is meant by calibration standards having to be 9 Explain what is meant by fitness for purpose' when applied to 10 The reliability of a measurement system is said to be 0.6. What does 11 The measurement instruments used in the tool room of a company to a measurement system traceable to national standards measurement system this mean? 22 Displacemer are found to have a failure rate of 001 per year. What does this mcan? 12 Determine the sensitivity of the instruments that gave the following readings Load kg Deflection mm8 36 54 72 Temperature 0 10 20 30 40 Voltage mV 0.59 1.19 180 2.42 Load N Charge pC3 6 12 13 Calibration of a volumeter gave the following data. Determine the maximum hystcresis error as a percentage of the full-scale range. Increasing input Standard mV VoltmetermV 0 1.0 L0 19 2.9 4.0 3.0 4.0 Decreasing input Standard mV 40 3.0 2.0 1.0 Voltmeter mV 4.0 3.0 2.1Explanation / Answer
5. Repeatability of a measurement system is attained when the multiple measurement of the same variable taken again and again over short period of time yields the same result everytime.
Lack of repeatability indicates that there is fluctuations everytime a measurement of the same variable is made. Statement 1 states this thing and hence the statement is true
Statement 2 states that there is fluctuations in repeating measurement over a number of samples. But is is not given when the measurements taken are of the same variable or of different variables. Therefore this statement cannot be said as true.
Therefore option b is correct.
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