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Measurement and Instrumentation

Measurement and Instrumentation
The coil of a moving coil meter has 100 turns, is 40 mm long and 30 mm wide. The control torque is 240×10-6 N-m on full scale. If magnetic flux density is 1Wb/m2 range of meter is

 4 mA.
 3 mA.
 1 mA.
 2 mA.

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

Almost zero
High
Low
None of the listed here

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Measurement and Instrumentation
A megger is usually

Moving iron type instrument
Moving coil type instrument
Hot-wire type instrument
Electro-static type instrument

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Measurement and Instrumentation
Purely mechanical instrument cannot be used for dynamic measurements because they have

 high inertia.
All of these
 large time constant.
 higher response time.

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Measurement and Instrumentation
The form factor in AC is the ratio of

Peak value to average value
Rms value to peak value
Rms value to average value
Peak value to rms value

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Measurement and Instrumentation
To measure ac as well as dc power, we use

None of the listed here
Induction wattmeter
Sometimes induction and sometimes dynamometer wattmeter
Dynamometer wattmeter

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