Types of Electrical Instruments
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Questions and Answers

What is the main purpose of a secondary instrument in an electrical measurement system?

  • To directly measure the electrical quantity. (correct)
  • To convert the electrical quantity into a digital signal.
  • To provide an absolute measurement of the electrical quantity.
  • To calibrate the primary instrument.

    • Which of the following is a key difference between analog and digital instruments?

  • Analog instruments require calibration, while digital instruments do not.
  • Analog instruments have a finite number of possible values, while digital instruments have an infinite number.
  • Analog instruments are more accurate than digital instruments.
  • Analog instruments measure continuous signals, while digital instruments measure discrete signals. (correct)

    • Which of the following is the best definition of accuracy in measurement?

  • The degree to which a measurement conforms to the expected value. (correct)
  • The closeness of a set of repeated measurements to the average of the set.
  • The smallest change in input signal that can be detected by the instrument.
  • The ratio of change in output signal to change in input signal.

    • Which of the following is the best definition of precision in measurement?

    <p>The closeness of a set of repeated measurements to the average of the set.</p> Signup and view all the answers

    Which type of error is defined as the difference between the expected value and the measured value?

    <p>Absolute error</p> Signup and view all the answers

    Which of the following is the best definition of resolution in measurement?

    <p>The smallest change in input signal that can be detected by the instrument.</p> Signup and view all the answers

    Which of the following is NOT a common element in a generalized measurement system?

    <p>Data Processing Element</p> Signup and view all the answers

    Absolute instruments provide the value of the measurand in terms of:

    <p>Instrument constant and its deflection</p> Signup and view all the answers

    Which of the following is the LEAST desirable characteristic of a measurement system?

    <p>High sensitivity</p> Signup and view all the answers

    In a generalized measurement system, the role of the ___ is to convert the measured quantity into a form that can be easily transmitted or processed.

    <p>Variable Conversion Element</p> Signup and view all the answers

    Which type of error is LEAST affected by increasing the number of measurements?

    <p>Systematic error</p> Signup and view all the answers

    Which of the following is the BEST way to improve the resolution of a measurement system?

    <p>Use a more precise variable conversion element</p> Signup and view all the answers

    What type of error is typically caused by the observer's inability to precisely read a meter scale?

    <p>Observational error</p> Signup and view all the answers

    Which of the following is a characteristic of random errors?

    <p>They are the accumulation of a large number of small effects</p> Signup and view all the answers

    Which type of error is caused by factors like friction in the bearings of the meter movement, incorrect spring tension, or faulty instruments?

    <p>Systematic error</p> Signup and view all the answers

    Which type of error is generally the fault of the person using the instruments and is due to incorrect reading or use of the instruments?

    <p>Gross error</p> Signup and view all the answers

    Which type of error can be minimized through proper calibration and maintenance of the instruments?

    <p>Systematic error</p> Signup and view all the answers

    What type of error is typically caused by subjecting instruments to harsh environments like high temperature, pressure, and humidity?

    <p>Systematic error</p> Signup and view all the answers

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