Electronic measurements and instrumentation miscellaneous

Electronic measurements and instrumentation miscellaneous

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Electronic Measurements And Instrumentation

Electronic measurements and instrumentation miscellaneous
  1. A 0–150V voltmeter has an accuracy of 1% of full-scale reading. The voltage measured by this instrument is 75V. The limiting error is:








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    Given voltmeter range 0 – 150V
    relative error Er = 1% = 0·01
    The magnitude of the limiting error of the instrument
    δA=Er × V where, V is the true value
    = 0·01 × 150
    = ·150
    The magnitude of the voltage being measured is 75V.
    The limiting error or relative error at this voltage is

    Er =
    δA
    		 =
    ·150
    		 = 2%
    V75

    Correct Option: B

    Given voltmeter range 0 – 150V
    relative error Er = 1% = 0·01
    The magnitude of the limiting error of the instrument
    δA=Er × V where, V is the true value
    = 0·01 × 150
    = ·150
    The magnitude of the voltage being measured is 75V.
    The limiting error or relative error at this voltage is

    Er =
    δA
    		 =
    ·150
    		 = 2%
    V75

  1. Wagner earthing device:








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    Wagner earthing device provides very high accuracy in measurement.

    Correct Option: C

    Wagner earthing device provides very high accuracy in measurement.

  1. High quality factor (Q) of an inductor can be measured by:








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    High quality factor (Q) of an inductor can be measured by Hay’s bridge.

    Correct Option: A

    High quality factor (Q) of an inductor can be measured by Hay’s bridge.

  1. Which of the following is a null defection device?








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    D’Arsonval galvanometer is a null deflection device.

    Correct Option: B

    D’Arsonval galvanometer is a null deflection device.

  1. Consider the following statements: A 3-phase balanced supply system is connected to a 3-phase unbalanced load. Power supplied to this load can be measured using
    1. two wattmeters.
    2. one wattmeters
    3. three wattmeters.
    Which of these statements is/are correct?








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    When a 3-phase balanced supply system is connected to a 3-phase unbalanced load, then power supplied to this load can be measured by using:
    ● Two wattmeters using in line or
    ● Three wattmeters using each one in each phase.

    Correct Option: B

    When a 3-phase balanced supply system is connected to a 3-phase unbalanced load, then power supplied to this load can be measured by using:
    ● Two wattmeters using in line or
    ● Three wattmeters using each one in each phase.