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Measurement and Instrumentation

Measurement and Instrumentation
No eddy current and hysteresis losses occur in

Electrodynamo meter instruments
Electrostatic instruments
PMMC instruments
Moving iron instruments

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Measurement and Instrumentation
A current of is measured with a thermocouple, 5 A full scale meter. What is the meter reading?

 5 A.
 4.06 A.
 6.09 A.
 2.03 A.

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Measurement and Instrumentation
Comparison methods are used

 because they take least time in measurement.
 when a high accuracy of measurement is required.
 because they are expensive.
 because they are most simple.

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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?

 25 mA.
 80 mA.
 50 mA.
  40 mA.

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Measurement and Instrumentation
The coil of a moving coil meter has 100 turns, is 40 mm long and 30 mm wide. The control torque is 240×10-6 N-m on full scale. If magnetic flux density is 1Wb/m2 range of meter is

 2 mA.
 3 mA.
 1 mA.
 4 mA.

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Measurement and Instrumentation
The pressure coil of a wattmeter should be connected on the supply side of the current coil when

Supply voltage is low
Load impedance is low
Load impedance is high
None of these

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