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Measurement and Instrumentation

Measurement and Instrumentation
Which one of the following meters has maximum loading effect on the circuit under measurement ?

 1 MΩ/volt
 100 Ω/volt
 10 MΩ/volt
 1000 Ω/volt

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Measurement and Instrumentation
A meter has a full-scale deflection of 90o at a current of 1 A. The response of the meter is square law. Assuming spring control, the current for a deflection at 45o will be

 0.25 A.
 0.50 A.
 0.67 A.
 0.70 A.

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Measurement and Instrumentation
The meter constant of a single phase 240 V induction watthour meter is 400 revolutions per KWh. The speed of the meter disc for a current of 10 Amperes of 0.8 p.f lagging will be

 21.1 rpm.
 16.02 rpm.
 18.2 rpm.
  12.8 rpm.

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Measurement and Instrumentation
A set of independent current measurements taken by four observers was recorded as : 117.02 mA, 117.11 mA, 117.08 mA and 117.03 mA. What is the range of error ?

 ± 0.045
 ± 0.065
 ± 0.056
 ± 0.054

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Measurement and Instrumentation
The use of thermocouple meters for AC measurement leads to scale which is

 logarithmic.
 square law.
 expontial.
 linear.

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Measurement and Instrumentation
The smallest change in measured variable to which instrument will respond is

 sensitivity.
  resolution.
 precision.
 accuracy.

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