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Measurement and Instrumentation

Measurement and Instrumentation
To measure 5 volts, if one selects a 0-100 volt range voltmeter which is accurate with in ± 1%, then the error in this measurement may be up to

 ± 7.5 %
 ± 1.5%
 ± 2.5%
 ± 20%

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Measurement and Instrumentation
Swamping resistance is used to compensate

 error due to strong magnetic field.
 none of these.
 both A and B.
 error due to temperature true variations.

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Measurement and Instrumentation
An induction wattmeter can be used for

Both DC and AC
Ac only
Dc only
Any of the listed here

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Measurement and Instrumentation
The form factor in AC is the ratio of

Rms value to average value
Peak value to average value
Peak value to rms value
Rms value to peak value

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Measurement and Instrumentation
Electrostatic instruments are used as

Both ammeter and voltmeter
Voltmeters only
Wattmeter only
Ammeters only

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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 ?

 ± 0.054
 ± 0.045
 ± 0.056
 ± 0.065

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