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Measurement and Instrumentation

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?

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

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Measurement and Instrumentation
The use of __________________ instruments is merely confined within laboratories as standardizing instrument.

 recording.
  absolute.
 integrating.
 indicating.

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Measurement and Instrumentation
A bridge circuit is shown in the figure below. Which one of the sentence given below is most suitable for balancing the bridge?

 First adjust R4 and then adjust R2.
 First adjust R2 and then adjust R4.
 First adjust R4 and then adjust R1.
 First adjust R2 and then adjust R3.

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Measurement and Instrumentation
The errors mainly caused by human mistakes are

 systematic error.
 instrumental error.
  gross error.
 observational error.

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

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Measurement and Instrumentation
When checked with an ohm meter an open resistor reads

  low but not zero.
  high but within tolerance.
  infinite.
  zero.

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