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Swamp resistance and condenser are used
- a)To reduce the error while measuring DC quantities in a moving iron instrument
- b)To reduce the error while measuring AC quantities in a moving iron instrument
- c)To reduce the error while measuring DC quantities in a moving coil instrument
- d)None of the above
Correct answer is option 'B'. Can you explain this answer?
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Swamp resistance and condenser are useda)To reduce the error while mea...
Concept:
- Swamping resistor and condenser are used to reduce the frequency error in MI instruments.
- In moving iron instruments, the change in frequency causes an error due to the change in magnitude of eddy currents set up in the metal portion of the instruments.
- The reactance of the operating coil changes by the change in frequency.
- At high frequencies, the meter will give a reading lower than the actual value and at low frequencies, the meter gives a reading higher than the actual.
- This type of error can be eliminated only if the impedance of the coil is independent of the frequency. This is achieved by having a capacitance in shunt with the swamping resistance of the coil as shown in the figure.
- In the above figure, C is condenser and r is swamping resistance, whereas L and R represent the reactance and resistance of operating coil in moving iron instrument.
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Swamp resistance and condenser are useda)To reduce the error while mea...
Background:
Moving iron instruments are commonly used to measure both DC and AC quantities. However, these instruments can produce errors in their measurements due to various factors. Two techniques, known as swamp resistance and condenser, are employed to reduce these errors and improve the accuracy of measuring AC quantities in a moving iron instrument.
Explanation:
1. Swamp Resistance:
- Swamp resistance is used to reduce the error while measuring AC quantities in a moving iron instrument.
- AC quantities have rapidly changing magnitudes and directions, which can cause the moving iron instrument to exhibit non-linear behavior.
- This non-linearity can lead to errors in the measurement of AC quantities.
- Swamp resistance is introduced in series with the moving coil or iron of the instrument to counteract this non-linearity.
- The swamp resistance creates a voltage drop that opposes the non-linear behavior of the instrument, resulting in a more linear response.
- By using an appropriate swamp resistance, the instrument can accurately measure AC quantities.
2. Condenser:
- Condenser, also known as a capacitor, is another technique used to reduce errors while measuring AC quantities in a moving iron instrument.
- AC quantities have a frequency component, which can induce eddy currents in the moving iron or coil of the instrument.
- These eddy currents can cause additional losses and affect the accuracy of the instrument's measurement.
- By connecting a condenser in parallel with the moving iron or coil, the eddy currents are diverted through the condenser, reducing their impact on the instrument's measurement.
- The condenser provides a low impedance path for the eddy currents, minimizing their effect on the instrument's operation.
- This helps in improving the accuracy of measuring AC quantities in a moving iron instrument.
Conclusion:
In conclusion, both swamp resistance and condenser techniques are used to reduce errors while measuring AC quantities in a moving iron instrument. The swamp resistance counteracts the non-linear behavior of the instrument, while the condenser diverts the eddy currents to improve the instrument's accuracy. These techniques are essential for achieving accurate measurements in AC applications using moving iron instruments.
Moving iron instruments are commonly used to measure both DC and AC quantities. However, these instruments can produce errors in their measurements due to various factors. Two techniques, known as swamp resistance and condenser, are employed to reduce these errors and improve the accuracy of measuring AC quantities in a moving iron instrument.
Explanation:
1. Swamp Resistance:
- Swamp resistance is used to reduce the error while measuring AC quantities in a moving iron instrument.
- AC quantities have rapidly changing magnitudes and directions, which can cause the moving iron instrument to exhibit non-linear behavior.
- This non-linearity can lead to errors in the measurement of AC quantities.
- Swamp resistance is introduced in series with the moving coil or iron of the instrument to counteract this non-linearity.
- The swamp resistance creates a voltage drop that opposes the non-linear behavior of the instrument, resulting in a more linear response.
- By using an appropriate swamp resistance, the instrument can accurately measure AC quantities.
2. Condenser:
- Condenser, also known as a capacitor, is another technique used to reduce errors while measuring AC quantities in a moving iron instrument.
- AC quantities have a frequency component, which can induce eddy currents in the moving iron or coil of the instrument.
- These eddy currents can cause additional losses and affect the accuracy of the instrument's measurement.
- By connecting a condenser in parallel with the moving iron or coil, the eddy currents are diverted through the condenser, reducing their impact on the instrument's measurement.
- The condenser provides a low impedance path for the eddy currents, minimizing their effect on the instrument's operation.
- This helps in improving the accuracy of measuring AC quantities in a moving iron instrument.
Conclusion:
In conclusion, both swamp resistance and condenser techniques are used to reduce errors while measuring AC quantities in a moving iron instrument. The swamp resistance counteracts the non-linear behavior of the instrument, while the condenser diverts the eddy currents to improve the instrument's accuracy. These techniques are essential for achieving accurate measurements in AC applications using moving iron instruments.
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Swamp resistance and condenser are useda)To reduce the error while measuring DC quantities in a moving iron instrumentb)To reduce the error while measuring AC quantities in a moving iron instrumentc)To reduce the error while measuring DC quantities in a moving coil instrumentd)None of the aboveCorrect answer is option 'B'. Can you explain this answer?
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