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Measurement and Instrumentation

Measurement and Instrumentation
In a megger controlling torque is provided by

Spring
Eddy current
Gravity
Coil

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Measurement and Instrumentation
Kelvin’s double bridge is used to measure low resistance because

 resistance variation due to temperature.
 there is no thermo electric emf.
 effect of contact and lead resistance is eliminated.
 it has high sensitivity.

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Measurement and Instrumentation
Which of the following devices may be used for extending the range of instruments?

Current transformers
All of the listed here
Shunt
Potential transformers

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Measurement and Instrumentation
Systematic errors are

 observational errors.
All of these
 instrument errors.
 environmental errors.

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Measurement and Instrumentation
The disc of an instrument using eddy current damping should be of

Non conducting and magnetic material
None of the listed here
Conducting and magnetic material
Conducting and non magnetic material

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Measurement and Instrumentation
An average reading digital multimeter reads 10 V when fed a triangular wave, symmetric about the axis. For the same input, an rms reading meter will read

 20.
 10.
 20√3.
  10√3.

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