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Measurement and Instrumentation

Measurement and Instrumentation
An induction wattmeter can be used for

Any of the listed here
Both DC and AC
Ac only
Dc only

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Measurement and Instrumentation
With a sweep time 10ms across the screen the approx. horizontal sawtooth frequency will be

1kHz
100Hz
500Hz
50Hz

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Measurement and Instrumentation
Induction type single phase energy meters measure electric energy in

Wh
kW
VAR
kWh

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Measurement and Instrumentation
Instrument transformers are

Pottential transformers
Both current and potential transformers
Power transformers
Current transformers

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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
The total current I = I1 + I2 in a circuit is measured as I1 = 150 ± 1A , I2 = 250 ± 2A, where the limits of error are as standard deviations. I is measured as

 (400 ± 3) A
 (400 ± 1.5) A
 (400 ± 2.24) A
 (400 ± 1) A

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