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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?

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

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Measurement and Instrumentation
An current of is measured with a thermocouple, 5 A full scale meter. What is the meter reading?

 2+3√2 A.
 2 A.
  3 A.
 5 A.

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Measurement and Instrumentation
Which of following are needed both for protection and metering?

 Instrument transformer.
 Energy meter.
 Power factor meters.
 Wattmeters.

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Measurement and Instrumentation
Which of the following devices should be used for accurate measurement of low D.C. voltage?

C. potentiometer
Small range moving coil voltmeter
None of these
Small range thermocouple voltmeter

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Measurement and Instrumentation
What is the expression for acceleration?

 Mass x acceleration
 Change in velocity / time
 Force x displacement
 Mass x velocity

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Measurement and Instrumentation
Which of the following is a variable displacement transducer?

 synchros
 tachometer
None of these
 potentiometer

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