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Measurement and Instrumentation

Measurement and Instrumentation
Moving iron instruments have _____ scale.

None of the listed here
Squared
Log
Uniform

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Measurement and Instrumentation
Ratio of readings of two wattmeter connected to measure power in a balanced 3-phase load is 5:3 and the load is inductive. The power factor at load is

 0.917 lead.
 0.6 lead.
 0.917 lag.
 0.6 lag.

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Measurement and Instrumentation
Piezoelectronic accelerometer

 Should be used for low frequency.
 Has a low natural frequency.
 Should use a monitoring source at low input impedance.
 Should be used for high frequencies above 100 Hz.

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Measurement and Instrumentation
A moving iron ammeter produces a full scale torque of 240 μNm with a deflection of 120° at a current of 10 A. The rate of change of self induction (μH/radian) of the instrument at full scale is

 2.0 μH/radian.
 12.0 μH/radian.
 114.6 μH/radian.
 4.8 μH/radian.

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Measurement and Instrumentation
In a portable instrument , the controlling torque is provided by

Eddy currents
Gravity
Spring
All of the listed here

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Measurement and Instrumentation
A power factor meter has

One current circuit and two pressure circuits
One current circuit and one pressure circuit
Two current circuit and one pressure circuit
None of the listed here

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