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Measurement and Instrumentation

Measurement and Instrumentation
The errors introduced by an instrument fall in which category ?

 Random errors
 Environmental errors
 Gross errors
 Systematic errors

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Measurement and Instrumentation
The thermocouple instrument will measure

None of these
Current
Flux
Voltage

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Measurement and Instrumentation
What is the approximate input impedance of a CRO?

 10 MΩ
 100 MΩ
 0
 1 MΩ

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

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Measurement and Instrumentation
Two capacitance, C1 = 150 ± 2.4µF and C2 = 120 ± 1.5 µF are connected in parallel. What is the limiting error of the resultant capacitance C (in µF) ?

 2.4µF
 0.9µF
 1.5µF
 3.9µF

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Measurement and Instrumentation
A wattmeter reads 30.34 W. The absolute error in the measurement is - 2.22 W. What is the true value of power?

 28.12 W.
None of these
 25.45 W.
 32.56 W .

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