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Discussion :: GATE Instrumentation

  1. Two ammeters A1 and A2 measure the same current and provide readings I1 and I2 , respectively. The ammeter errors can be characterized as independent zero mean Gaussian random variables of standard deviations σ1 and σ2 , respectively. The value of the current is computed as : 
    I = μ I1 + (1 - μ) I2 
    The value of μ which gives the lowest standard deviation of I is
    2. A.
    σ22/(σ12 + σ22)
    B.
    σ12/(σ12 + σ22)
    C.
    σ2/(σ12 + σ22)
    D.
    σ1/(σ12 + σ22)

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    Workspace

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    Answer : Option A

    Explanation :

    -NA-

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