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Measurement and Instrumentation

Measurement and Instrumentation
Which of the following are integrating instruments?

Ammeters
Wattmeters
Ampere hour and watt hour meters
Voltmeters

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Measurement and Instrumentation
Which one of the following meters has maximum loading effect on the circuit under measurement ?

 100 Ω/volt
 1 MΩ/volt
 1000 Ω/volt
 10 MΩ/volt

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Measurement and Instrumentation
A spring-controlled moving iron voltmeter draws a current of 1 mA for full scale value of 100V. If it draws a current of 0.5 mA, the meter reading is

 100 V.
 200 V.
 25 V.
 50 V.

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Measurement and Instrumentation
The limiting errors of measurement of power consumed by and the current passing through a resistance are ±1.5% and ±1% respectively. What is the limiting error ( in %) of measurement of resistance ?

 ± 1.5%
 ± 1%
 ±3.5%
 ± 2.5%

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Measurement and Instrumentation
A moving iron instrument can be used for

DC only
Both DC& AC
None of the listed here
AC only

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Measurement and Instrumentation
A meter has a full-scale deflection of 90o at a current of 1 A. The response of the meter is square law. Assuming spring control, the current for a deflection at 45o will be

 0.67 A.
 0.50 A.
 0.70 A.
 0.25 A.

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