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Measurement and Instrumentation

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

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

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Measurement and Instrumentation
The resistance of a circuit is measured from the relation R= P/I2, where P is the power fed into the circuit and I is the current flowing through it. If the limiting errors in the measurement of power and current are respectively ± 1.0% and ± 1.0%, then what will be the limiting error in measurement of resistance ?

 ±3.5%
 ± 1.5%
 ±0.5%
 ± 3.0%

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

 sensitivity.
 precision.
 accuracy.
  resolution.

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Measurement and Instrumentation
The use of __________________ instruments is merely confined within laboratories as standardizing instrument.

  absolute.
 integrating.
 recording.
 indicating.

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Measurement and Instrumentation
In two wattmeter method of power measurement if the total power is measured by one wattmeter only then power factor of the system is

 none of above.
 0.5.
 0.
 1.

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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

 0.50 A.
 0.25 A.
 0.67 A.
 0.70 A.

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