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Measurement and Instrumentation

Measurement and Instrumentation
For a circuit given that I = 2 ± 5 % A, R = 100 ± 0.2 % Ω the limiting error in the power dissipation I2 R in the resistor R is

 25.2%
 5.2%
 1.2%
 10.2%

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Measurement and Instrumentation
Comparison methods are used

 when a high accuracy of measurement is required.
 because they are expensive.
 because they take least time in measurement.
 because they are most simple.

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

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

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Measurement and Instrumentation
Which of the following instruments can be used to measure AC current only?

Moving iron voltmeter
Moving iron ammeter
Induction type ammeter
Permanent Magnet Type ammeter

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Measurement and Instrumentation
When the pointer of an indicating instrument comes to rest in the final deflected position, ______

None of the listed here
Only controlling torque acts
Both deflecting and controlling torques act
Only deflecting torque acts

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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
 3.9µF
 1.5µF
 2.4µF

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