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Measurement and Instrumentation

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

 10 MΩ
 0
 100 MΩ
 1 MΩ

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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?

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

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Measurement and Instrumentation
Attraction and repulsion type instruments are the two different types of which instrument ?

 Induction type.
  Moving iron type.
 Dynamo-meter type.
 Multipliers.

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Measurement and Instrumentation
The two pressure coils of a single phase power factor meter have

The same dimensions and the same number of turns
The same number of turns but different dimensions
The same dimension but different number of turns
None of these

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Measurement and Instrumentation
0-150 V voltmeter has an accuracy of 1% of full-scale reading. The voltage measured by the instrument is 75 V. The limiting error is

 2%
 4%
 3%
 1%

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Measurement and Instrumentation
The internal resistance of an ammeter should be

High
Very small
Medium
Infinity

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