Measurement and Instrumentation
A variable w is related to three other variables x, y and z as w = xy/z. The variables are measured with meters of accuracy ± 0.5% reading, ± 1% of full scale value and ± 1.5% reading. The actual readings of the three meters are 80, 20 and 50 with 100 being the full scale value for all three. The maximum uncertainty in the measurement of w will be

 ± 8%
 ± 6%
 ± 7%
 ± 5%

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Measurement and Instrumentation
In measurement system, the function of the signal manipulating elements is to

 change the quantity under measurement to an analogues signal.
 to perform non liner operation like clipping filtering, chopping and clamping.
 to perform linear operation like addition and multiplication.
 change the magnitude of the input signal while retaining its identity.

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