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Measurement and Instrumentation

Measurement and Instrumentation
No eddy current and hysteresis losses occur in

Moving iron instruments
Electrostatic instruments
Electrodynamo meter instruments
PMMC instruments

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

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

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Measurement and Instrumentation
The watt hour meter is ______ instrument.

A recording
An indicating
An integrating
A transfer

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Measurement and Instrumentation
Piezoelectric effect is carried out in

  crystal filter.
  composite filter.
  constant k prototype.
  m derived.

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Measurement and Instrumentation
Which one the following statements is correct? The application of the instrument in wrong manner in the procedure of measurement results in a/an

 random error
 gross error
 systematic error
 instrument error

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