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    Drift, static error, dead zone and non-linearity are undesirable static characteristics in measurement systems. Drift is an undesired gradual change

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    In measurement systems, which of the following are undesirable static characteristics?

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    BSNL JE (TTA) 27 September 2016 Shift 1 Paper

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    Sensitivity and accuracy

    Drift, static error, accuracy and dead zone

    Reproducibility and non-linearity

    Drift, static error, dead zone and non-linearity

    Answer (Detailed Solution Below)

    Option 4 : Drift, static error, dead zone and non-linearity

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    BSNL JE (TTA) 25 September 2016 Shift 1 Paper

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    200 Questions 200 Marks 180 Mins

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    Detailed Solution

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    Drift, static error, dead zone and non-linearity are undesirable static characteristics in measurement systems.

    Drift is an undesired gradual change of instrument output over a period of time which is unrelated to change in input, operating conditions or load.

    The dead zone is defined as the range within which the variable can vary without being detected.

    Accuracy and linearity are related to each other, so it is better to keep non-linearity as small as possible.

    Static errors are errors that don’t change with respect to time which are also undesirable.

    Important Points

    Fidelity of a system is defined as the ability of the system to reproduce the output in the same form as the input. It is the degree to which a measurement system indicates changes in the measured quantity without any dynamic error. It is not a static characteristic.

    Sensitivity: It is defined as the ratio of the changes in the output of an instrument to a change in the value of the quantity being measured. It denotes the smallest change in the measured variable to which the instrument responds.

    Deflection factor or inverse sensitivity is the reciprocal of sensitivity.

    Drift: It indicates the variation of the output with the time. No drift means that with a given input the measured values doesn’t vary with time.

    Factors which causes drift are stray electric and magnetic fields, thermal emfs, changes in temperature, mechanical vibrations, wear and tear and high mechanical stresses developed in some parts of the instruments etc.

    Stray and electromagnetic fields are can be prevented by proper shielding

    Effect of mechanical vibrations can be minimized by having proper mountings

    Temperature changes during the process should be preferably avoided otherwise compensation need to be used

    Drift can be classified as three categories.

    Zero drift: If the whole calibration gradually shifts due to slippage, permanent set, or due to undue warming up of electronic tube circuits, zero drift sets in. It can be prevented by zero setting. The characteristics are shown below.

    Span drift or Sensitivity drift: If there is proportional change in the indication all along the upward scale, span drift. The characteristics are shown below.

    Zonal drift: In case the drift occurs only over a portion of span of an instrument, it is called as zonal drift.

    Dead zone: It is the largest change of input quantity for which there is no output of the instrument.

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    Question: The Undesirable Characteristics Of A Measuring System O A Reliability B. Linearity O C. Repeatability O D. Dead Zone Clear My Choice Question 3 Not Yet Answered Marked Out Of 1.00 PFL Which Of The Following Is Used In Photo Conductive Cell? A. Selenium O B. Quartz O C. Rochelle Salt O D. Lithium Sulphate Question 5 Not Yet Answered Marked Out Of 100 P

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    Transcribed image text: The undesirable characteristics of a measuring system O a Reliability b. linearity O c. Repeatability O d. Dead zone Clear my choice Question 3 Not yet answered Marked out of 1.00 PFL Which of the following is used in photo conductive cell? a. Selenium O b. Quartz O c. Rochelle salt O d. Lithium sulphate Question 5 Not yet answered Marked out of 100 P Flag question A device or mechanism used to determine the present value of the quantity under measurement known as Multi-meter b. Sensitivity Instrument d. Error Question 1 Answer saved Marked out of 1.00 P Flag question In which stage the measurement system comes in contact with phy.al Quan O a. output stage O b. Signal processor stage C. Input stage O d. Measurement stage Clear my choice BI w hp Question 3 Not yet awered Marked out of 1.00 For a Measurement, indicated value is 225 while true value of 2200. What will be the static error of an instrument Pla question a TV O 0.24 O 1.0 O d.o.5V A input device which converts: O a. Physical quantity into mechanical signal O b. Electrical signal into physical quantity O c. Physical quantity into non physical signal only d. Physical quantity into measurable signals Thermocouple can be used to measure a. All of mentioned temperatures O b. Temperature of solid O c. Temperature of gas O d. Temperature of liquid Clear my choice Question 1 Answer saved Marked out of 1.00 p Flag question In which stage the measurement system comes in contact with phy.al Quan O a output stage O b. Signal processor stage C. Input stage O d. Measurement stage clear my choice 9 w PS hp

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    In measurement, systems which one of the following are undesirable static characteristics?

    ⚛ Question - In measurement, systems which one of the following are undesirable static characteristics? ☑ Answer - drift, static error, deadzone and non linearity. ☀ Click for more questions. ☂

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    Electrical Engineering

    Electronic and Electrical Measurements and Instruments

    In measurement, systems which one of the ...

    Que.

    Que. In measurement, systems which one of the following are undesirable static characteristics?

    A. sensitivity and accuracy

    B. drift static error and dead zone

    C. reproductibility and nonlinearity

    D. drift, static error, deadzone and non linearity

    Right Answer is :

    ✓ D. drift, static error, deadzone and non linearity

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