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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.

 2
 4
 5
 1

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Measurement and Instrumentation
The expected value of the voltage across a resistor is 80 V, and the measured value is 79 V. What is the percentage error and relative accuracy of the measurement ?

 1.25% & 98.75%
 1.5% & 99%
 1.5% & 98.75%
 1.25% & 98.25%

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Measurement and Instrumentation
A moving coil ammeter has a uniform scale with 50 division and gives a full scale reading 10 A. The instrument can read up to (1/5)th of a scale division with a fair degree of certainty. What is the resolution of the instrument in mA?

 80 mA.
 25 mA.
  40 mA.
 50 mA.

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Measurement and Instrumentation
For measurement on high voltage capacitors, the suitable bridge is

Any of the listed here
Wein bridge
Schering bridge
Modified De santy's bridge

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Measurement and Instrumentation
A 1 mA meter is to be converted to 1 A ammeter. The meter resistance is 100 Ω. The value of shunt resistance

 0.001 Ω.
 100 Ω.
 0.1001 Ω.
 1000 Ω.

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Measurement and Instrumentation
A wheatstone bridge cannot be used for precision measurements because errors are introduced into on account of

 Thermoelectric emfs.
 All of above.
 Contact resistance.
 Resistance of connecting leads.

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