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Measurement and Instrumentation

Measurement and Instrumentation
Which of following are needed both for protection and metering?

 Power factor meters.
 Wattmeters.
 Instrument transformer.
 Energy meter.

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Measurement and Instrumentation
Wagner earthing device is used to eliminate errors due to

None of these
Electromagnetic coupling
Both A and B
Electrostatic coupling

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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.

 4
 1
 2
 5

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

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

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Measurement and Instrumentation
The controlling torque of an indicating instrument ______ as the deflection of the moving system increases.

None of the listed here
Increases
Remains same
Decreases

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Measurement and Instrumentation
Figure show an RC potentiometer to measure AC voltage. It is desire that Vo/Vi should be independent of frequency. The value of C shoud be

 11 µF.
 0.09 µF.
 0.1 µF.
 10 µF.

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