Measurement And Instrument Theory - 2 - MCQs with answers

Measurement And Instrument Theory - 2 - MCQs with answers

Q1. An instrument with a range of 0-10 bar is used for measuring pressure. If the expected value of reading is between 0 and 1 bar then the instrument will give

A. More accurate readings than the instrument with range of 0-5 bar

B. Less accurate readings than the instrument with range of 0-5 bar

C. Accuracy of reading will be same for both the instruments with range of 0-10 bar and 0-5 bar

D. None of these

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Q2. A voltmeter connected across a resistor gives a value of 65 V but the expected value of resistor was 68 V. Then the absolute error and the relative accuracy of the measurement will be

A. 3.2%, 96.8%
B. 3.8%, 96.2%
C. 4%, 96%
D. 4.4%, 95.59%

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Q3. Precision of an instrument is defined as

A. Closeness of output to the true value
B. Change in output for every change in input
C. Degree of freedom from random errors
D. Both (a) and (b)

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Q4. An instrument with high precision implies

A. High accuracy
B. Low accuracy
C. Does not imply anything about measurement accuracy
D. None of these

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Q5. Low accuracy measurements from a high precision instrument are normally caused by

A. Bias in the measurement
B. Human errors
C. Instrumental defect
D. Low temperature

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Q6. Which of the following statements are correct

I. Repeatability means the closeness of output readings when the same input is applied repetitively over a short period of time, with the same measurement conditions and same instruments.

II. Reproducibility means the closeness of output readings for the same input when there are changes in the method of measurement and conditions of measurement.

A. Both I and II are correct
B. Only I is correct
C. Only II is correct
D. Both are incorrect

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Q7. For an instrument the degree of repeatability or reproducibility in measurements is an alternative way of expressing its

A. Precision
B. Accuracy
C. Sensitivity
D. Linearity

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Q8. Range or span of an instrument defines

A. Minimum value of quantity that the instrument is designed to measure

B. Maximum value of quantity that the instrument is designed to measure

C. Both minimum and maximum value of quantity that the instrument is designed to measure

D. None of these

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Q9. A voltmeter of 0 to 250 V has an error of ± 1% of full scale deflection. If the true voltage of voltmeter is 25 V then the range of its reading is

A. 22.5 V – 27.5 V
B. 27.5 V – 29.5 V
C. 24 V – 26 V
D. 25.5 V – 26.5 V

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Q10. Four observers recorded a set of current measurement as:

125.09 mA, 125.21 mA, 125.05 mA, 125.14 mA.

The range or span of error will be

A. ± 0.02 mA
B. ± 0.06 mA
C. ± 0.08 mA
D. ± 1.02 mA

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