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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
 5
 4
 1

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Measurement and Instrumentation
Piezoelectronic accelerometer

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

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Measurement and Instrumentation
The high torque to weight ratio in an analog indicating instrument indicates

 none of these.
 low friction loss.
 high friction loss.
 nothing related to friction loss.

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Measurement and Instrumentation
A 0 - 250V voltmeter has a guaranteed accuracy of 2% of full scale reading. What is the percentage of error if it measures 150V?

 3.33%
 2%
 1%
 5%

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Measurement and Instrumentation
To measure 5 volts, if one selects a 0-100 volt range voltmeter which is accurate with in ± 1%, then the error in this measurement may be up to

 ± 1.5%
 ± 20%
 ± 2.5%
 ± 7.5 %

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Measurement and Instrumentation
A dynamometer wattmeter can be used for

Any of the listed here
AC only
DC only
Both DC and AC

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