Identify the instrument that does not exist:a)Dynamometer-type ammeterb)Dynamometer-type wattmeterc)Moving-iron voltmeterd)Moving-iron wattmeterCorrect answer is option 'D'. Can you explain this answer?

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Identify the instrument that does not exist:

a)
Dynamometer-type ammeter
b)
Dynamometer-type wattmeter
c)
Moving-iron voltmeter
d)
Moving-iron wattmeter

Correct answer is option 'D'. Can you explain this answer?

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Instrumentation Engineering - IN 2017 GATE Paper MCQ Quiz

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Identify the instrument that does not exist:a)Dynamometer-type ammeter...

To Measure power we require to coils (C.C & P.C)
→ Dynamo meter will consist two coils. So it can measure power.
→ Dynamo meter can also measure current and voltage, if we connect C.C & P.C in series.
→ Moving Iron meter will have only one coil, so it can measure current and voltage But not power.
Note: Moving Iron wattmeter doesn’t exist.

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Identify the instrument that does not exist:a)Dynamometer-type ammeterb)Dynamometer-type wattmeterc)Moving-iron voltmeterd)Moving-iron wattmeterCorrect answer is option 'D'. Can you explain this answer?

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