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Error due to change in frequency in moving iron instruments may be reduced by using a/an:
- a)Induction coil
- b)Condenser of suitable value in parallel with swamping resistance
- c)Condenser of suitable value in series with swamping resistance
- d)Balancing circuit
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
Error due to change in frequency in moving iron instruments may be red...
- The main source of this error is the change in reactance of the meter-coil with frequency.
- It is due to the dependence of the inductive reactance on the frequency of the supply.
- The inductive reactance of the coil increases with an increase in frequency (XL = 2πfL).
- Hence, overall impedance also increases and so the current through the meter reduces.
- Therefore, the deflection will be less.
In order to neutralize this error in the case of MI voltmeters, a properly designed capacitor is connected across the series resistor (i.e., multiplier).
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Error due to change in frequency in moving iron instruments may be red...
Introduction:
Moving iron instruments are commonly used for measuring AC quantities. However, these instruments are susceptible to errors due to changes in frequency. To reduce this error, a condenser of suitable value in parallel with a swamping resistance is used.
Explanation:
1. Error due to change in frequency:
When the frequency of the AC signal changes, the impedance of the moving iron instrument also changes. This leads to variations in the current flowing through the instrument and affects its accuracy. The error due to change in frequency can be significant and needs to be minimized.
2. Swamping resistance:
A swamping resistance is connected in series with the moving iron instrument. Its purpose is to provide a constant resistance to the AC signal, independent of frequency. This helps in stabilizing the current flowing through the instrument and reducing errors.
3. Condenser in parallel:
To further reduce the error due to change in frequency, a condenser of suitable value is connected in parallel with the swamping resistance. The condenser acts as a frequency compensating element.
4. Working principle:
When the frequency of the AC signal increases, the impedance of the condenser decreases. This causes a greater proportion of the current to flow through the condenser rather than the moving iron instrument. As a result, the error due to change in frequency is reduced.
5. Selection of condenser value:
The value of the condenser is chosen based on the desired frequency range over which the instrument needs to operate accurately. The capacitance of the condenser should be such that it compensates for the change in impedance of the moving iron instrument over this frequency range.
6. Parallel connection:
Connecting the condenser in parallel with the swamping resistance ensures that the compensation is provided directly to the moving iron instrument. This allows the instrument to accurately measure AC quantities over a wider range of frequencies.
Conclusion:
By using a condenser of suitable value in parallel with a swamping resistance, the error due to change in frequency in moving iron instruments can be significantly reduced. This helps in improving the accuracy and reliability of AC measurements.
Moving iron instruments are commonly used for measuring AC quantities. However, these instruments are susceptible to errors due to changes in frequency. To reduce this error, a condenser of suitable value in parallel with a swamping resistance is used.
Explanation:
1. Error due to change in frequency:
When the frequency of the AC signal changes, the impedance of the moving iron instrument also changes. This leads to variations in the current flowing through the instrument and affects its accuracy. The error due to change in frequency can be significant and needs to be minimized.
2. Swamping resistance:
A swamping resistance is connected in series with the moving iron instrument. Its purpose is to provide a constant resistance to the AC signal, independent of frequency. This helps in stabilizing the current flowing through the instrument and reducing errors.
3. Condenser in parallel:
To further reduce the error due to change in frequency, a condenser of suitable value is connected in parallel with the swamping resistance. The condenser acts as a frequency compensating element.
4. Working principle:
When the frequency of the AC signal increases, the impedance of the condenser decreases. This causes a greater proportion of the current to flow through the condenser rather than the moving iron instrument. As a result, the error due to change in frequency is reduced.
5. Selection of condenser value:
The value of the condenser is chosen based on the desired frequency range over which the instrument needs to operate accurately. The capacitance of the condenser should be such that it compensates for the change in impedance of the moving iron instrument over this frequency range.
6. Parallel connection:
Connecting the condenser in parallel with the swamping resistance ensures that the compensation is provided directly to the moving iron instrument. This allows the instrument to accurately measure AC quantities over a wider range of frequencies.
Conclusion:
By using a condenser of suitable value in parallel with a swamping resistance, the error due to change in frequency in moving iron instruments can be significantly reduced. This helps in improving the accuracy and reliability of AC measurements.
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Error due to change in frequency in moving iron instruments may be reduced by using a/an:a)Induction coilb)Condenser of suitable value in parallel with swamping resistancec)Condenser of suitable value in series with swamping resistanced)Balancing circuitCorrect answer is option 'B'. Can you explain this answer?
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