ECE :: Measurements and Instrumentation
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A 1 mA meter is to be converted to 1 A ammeter. The meter resistance is 100 Ω. The value of shunt resistance is
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The use of thermocouple meters for ac measurement leads to a scale which is
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Assertion (A): A low power factor wattmeter has special constructional features to ensure accurate measurement.
Reason (R): Extension of wattmeter range in dc circuit can be easily done by using current and potential transformer.
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Magnetic deflection is inversely proportional to
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The most commonly used moving iron instruments are
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A moving iron instrument can be used for
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Two voltmeters are each 0-300 V range. Their internal resistances are 10 kΩ and 20 kΩ They are connected is series and a voltage of 400 V is applied. Their readings respectively will be
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A 300 V voltmeter has an accuracy of ± 2% of full scale deflection. When the reading is 222 V, the actual voltage
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In a thermocouple two metal junctions between metals M1 and M2 are kept at temperature T1 and T2. The thermocouple emf is produced because
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