Measurement and Instrumentation
A resistance is measured by the voltmeter-ammeter method employing dc excitation and a voltmeter of very high resistance connected directly across the unknown resistance. If the voltmeter and ammeter reading are subject to maximum possible errors of ± 2.4 % and ± 1.0 % respectively, then the magnitude of the maximum possible percentage error in the value of resistance deduced from the measurement is nearly

 ± 3.4%
 ± 2.4%
 ± 1.4%
 ± 1%

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

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

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Measurement and Instrumentation
Which of following is not correct?

 A shunt should have a very low resistance.
  An electronic voltmeter draw appreciable current from the source.
 An ammeter should have a very low resitance.
 Voltmeter should have very high resistance.

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Measurement and Instrumentation
Why is a MISC meter not recommended for DC measurement?

The error is high due to hysteresis effect
The meter does not respond to DC signals
The error is high due to eddy current effect
The meter is calibrated for AC and it’s error for DC would be high

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