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Measurement and Instrumentation

Measurement and Instrumentation
In a moving coil instrument, the deflecting torque is proportional to

Square of the current
Squareroot of the current
Sine of the measurand
Current

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Measurement and Instrumentation
0-150 V voltmeter has an accuracy of 1% of full-scale reading. The voltage measured by the instrument is 75 V. The limiting error is

 3%
 1%
 4%
 2%

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Measurement and Instrumentation
The errors introduced by an instrument fall in which category ?

 Environmental errors
 Random errors
 Gross errors
 Systematic errors

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Measurement and Instrumentation
The high torque to weight ratio in an analog indicating instrument indicates

 high friction loss.
 nothing related to friction loss.
 none of these.
 low friction loss.

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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
 ± 0.056
 ± 0.054
 ± 0.065

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Measurement and Instrumentation
The total current I = I1 + I2 in a circuit is measured as I1 = 150 ± 1A , I2 = 250 ± 2A, where the limits of error are as standard deviations. I is measured as

 (400 ± 2.24) A
 (400 ± 1.5) A
 (400 ± 3) A
 (400 ± 1) A

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