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Measurement and Instrumentation

Measurement and Instrumentation
In induction type ammeter, _____ damping is provided.

Air friction
Eaddy current
Fluid friction
None of the listed here

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Measurement and Instrumentation
Which of the following are integrating instruments?

Ammeters
Voltmeters
Ampere hour and watt hour meters
Wattmeters

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Measurement and Instrumentation
Two capacitance, C1 = 150 ± 2.4µF and C2 = 120 ± 1.5 µF are connected in parallel. What is the limiting error of the resultant capacitance C (in µF) ?

 0.9µF
 2.4µF
 3.9µF
 1.5µF

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Measurement and Instrumentation
The internal resistance of a milli-ammeter must be very low for

 high accuracy.
 high precision.
 minimum effect on the current in the circuit.
 high sensitivity.

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Measurement and Instrumentation
Which instrument has identical calibration for ac as well as dc values?

Hot wire type
Moving iron type
Moving coil type
Induction type

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Measurement and Instrumentation
The repeat accuracy of an instrument can be judged from its

Static error
Dynamic error
Standard deviation of error
Linearity error

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