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Measurement and Instrumentation

Measurement and Instrumentation
The inductance of a certain moving iron ammeter is expressed as L = 2+5θ-θ2 µH. The control spring torque is 2 × 10-6 Nm/radian. Find the deflection in radians for a current of 2A.

 5
 1
 4
 2

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Measurement and Instrumentation
A pressure measurement instrument is calibrated between 10 bar and 260 bar. The scale span of the instrument is

 10 bar.
 260 bar.
  250 bar.
 270 bar.

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Measurement and Instrumentation
Most accurate measurement of unknown resistance will be by

Voltmeter and ammeter
Ohmmeter
Potentiometer
Wheatstone bridge

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

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

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Measurement and Instrumentation
Two voltmeters have the same range 0-400V. The internal impedance are 30,000 Ohms and 20,000 Ohms. If they are connected in series and 600V be applied across them, the readings are

One of the meters out of the range and other 100V
300V each
400V and 200V
360V and 240V

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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.
 0.67 A.
 0.50 A.
 0.70 A.

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