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Measurement and Instrumentation

Measurement and Instrumentation
A voltage of 2.70 V is being measured by an analog indicating instrument having a scale range of 0 – 5.0 V. If the instrument reads 2.65 V, then absolute error in measurement is

 0.01V
 0.05V
 0.01V
 0.25V

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Measurement and Instrumentation
The current coil of a wattmeter is connected to the CT of R-phase. The potential coil is connected across Y and B phases. The wattmeter measures

Active power in R phase
Reactive power of R phase
Power proportional to 3 phase power if the load is balanced
Active power of Y phase

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Measurement and Instrumentation
A moving coil of a meter has 100 turns, and a length and depth of 10 mm and 20 mm respectively. It is positioned in a uniform radial flux density of 200 mT. The coil carries a current of 50 mA. The torque on the coil is

 100 µNm.
 1 µNm.
 2 µNm.
  200 µNm.

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Measurement and Instrumentation
Which one of the following meters has maximum loading effect on the circuit under measurement ?

 1000 Ω/volt
 1 MΩ/volt
 10 MΩ/volt
 100 Ω/volt

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Measurement and Instrumentation
The EMF of Weston standard cell is measured using

Potentiometer
Digital Volt meter
Moving- iron meter
Moving-coil meter

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Measurement and Instrumentation
Piezoelectronic accelerometer

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

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