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Measurement and Instrumentation

Measurement and Instrumentation
In a gravity controlled instrument, the deflection angle is proportional

Square of the measurand
Sine inverse of measurand
Sine of the measurand
Measurand

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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

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

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Measurement and Instrumentation
In a dynamometer wattmeter, the moving coil is the

Current coil and potential coil
Potential coil
Current coil
None of the listed here

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Measurement and Instrumentation
Alternating current is measured by

Moving iron repulsion type voltmeter
Electrostatic ammeter
Induction ammeter
Permanent magnet type ammeter

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Measurement and Instrumentation
Which of the following meter is most suitable for measuring radio frequency currents?

 Moving - coil meter.
 VTVM.
  Thermocouple meter.
 Moving - iron meter.

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Measurement and Instrumentation
Piezoelectronic accelerometer

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

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