In a moving coil instrument, the deflecting torque is proportional to
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ECE · all questionsMeasurement And Instrumentation
Measurement And Instrumentation
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In a moving iron meter, the deflecting torque is proportional to
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Which wave has the least form factor?
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The current coil of a wattmeter is connected to the CT of R-phase. The potential coil is connected across Y and B phases. The wattmeter measures
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Two voltmeters have the same range 0-400V. The internal impedance are 30,000 Ohms and 20,000 Ohms. If they are connected in series and 600V be applied across them, the readings are
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The two pressure coils of a single phase power factor meter have
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To measure the flux, devices used are based on
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No eddy current and hysteresis losses occur in
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The absolute measurement of resistance is done by
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For power measurement of three phase circuit by two wattmeter method, when the value of power factor is less than 0.5 lagging
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A permanent magnet moving coil ammeter has a coil resistance of 99ohm and Full Scale DeflectionFSD. current of 0.1mA. Shunt resistance is 1 ohm. Current through the meter at 0.5 F.S.D is
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The chemical effect of current is used in
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Some wire- wound resistors have bifilar winding. This type of winding is used to
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The pressure coil of a wattmeter should be connected on the supply side of the current coil when
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A resistor of 10 kΩ with 5% tolerance is connected in parallel with a 5 kΩ resistor of 10% tolerance. What is the tolerance limit for the parallel network?
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It is found that 10A current passes through a resistor of 10°hms. The resistor has 5% tolerance . The error in measurement of current can be as high as 5%. What is max error in measurement of power, calculated from measured value of I and the nominal value of resistor?
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The EMF of Weston standard cell is measured using
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A mulliammeter can be used as
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Wagner earthing device is used to eliminate errors due to
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The multiplier and the meter coil in a voltmeter are in
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