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Measurement and Instrumentation

Measurement and Instrumentation
Which one of the following units is a fundamental unit?

 Watt
 Joule/sec
 Newton
 Ampere

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Measurement and Instrumentation
The resistance in the circuit of the moving coil of a dynamometer wattmeter should be

Almost zero
None of the listed here
High
Low

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Measurement and Instrumentation
Basically potential meter is a device for

Comparing two currents
Comparing two voltages
Measuring a current
Measuring a voltage

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Measurement and Instrumentation
If the instrument is to have a wide range, the instrument should have

Logarithmic scale
Square-law scale
Linear scale
Exponential scale

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

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

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Measurement and Instrumentation
For the AC bridge circuit shown in figure at balance the value of Rd will be

 (Rc/Rb).Ra.
 (Rc/Ra).Rb.
 (Ra/Rc).Rb.
 (Rb/Rc).Ra.

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