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Measurement and Instrumentation

Measurement and Instrumentation
To measure high frequency currents, we mostly use ______ ammeter.

Moving iron
Thermocouple
Dynamometer
Hot wire

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Measurement and Instrumentation
The moving coil-meters, damping is provided by

 eddy current disk.
 the coil spring attached to the moving.
 damping vane in the airtight chamber.
 the aluminium frame of the coil.

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Measurement and Instrumentation
The quantity 1/√(∈0 × μ0) in SI units has the

 none of these.
 both ‘a’ and ‘b’.
 dimension LT-1.
 speed of light.

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Measurement and Instrumentation
Comparison methods are used

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

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Measurement and Instrumentation
The full-scale deflection current of an ammeter is 1 mA and its internal resistance is 100°hm. This is to have full deflection when 100V is measured. What is the value of series resistor to be used?

99.99 ohms
99.99 K ohms
100 K ohms
100 ohms

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Measurement and Instrumentation
The internal resistance of Weston standard cell is of order of

 1000 ohm.
 10 ohm.
 1 ohm.
 100 ohm.

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