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For the measurement of the earth resistance of a given earth electrode:
- a)Collecting electrode should be very near to the electrode under test
- b)Collecting electrode should touch the electrode under test
- c)Collecting electrode should be far way the electrode under test
- d)None of these
Correct answer is option 'C'. Can you explain this answer?
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For the measurement of the earth resistance of a given earth electrode...
When performing a measurement, the aim is to position the auxiliary test electrode C far away from the earth electrode under test so that the auxiliary test electrode P will lie outside the effective resistance areas of both the earth system and the other test electrode
If the current test electrode C is too close, the resistance areas will overlap and there will be a steep variation in the measured resistance as the voltage test electrode is moved.
If the current test electrode is correctly positioned, there will be a flat (or very nearly so) resistance area somewhere in between it and the earth system and variations in the position of the voltage test electrode should only produce very minor changes in the resistance valu
Most Upvoted Answer
For the measurement of the earth resistance of a given earth electrode...
Measurement of Earth Resistance:
Collecting electrode distance:
The correct answer is option 'C', which states that the collecting electrode should be far away from the electrode under test for the measurement of earth resistance. This is because if the collecting electrode is too close to the electrode under test, it may affect the measurement due to the influence of the test current on the electrode. Therefore, proper distance between the electrodes is crucial for accurate measurement.
Factors affecting distance:
There are several factors that can affect the distance between the electrodes, including the size and shape of the electrodes, the depth of the test, and the soil resistance. In general, a distance of at least 20 times the depth of the electrode is recommended for accurate measurement.
Procedure:
The procedure for measuring earth resistance involves connecting the test electrode to the earth and injecting a test current into the earth. The voltage drop between the test electrode and the collecting electrode is then measured, and the earth resistance is calculated using Ohm's law.
Conclusion:
In conclusion, the correct distance between the electrodes is essential for accurate measurement of earth resistance. The collecting electrode should be far away from the electrode under test, and a distance of at least 20 times the depth of the electrode is recommended for accurate measurement. The procedure involves injecting a test current and measuring the voltage drop, and the earth resistance is calculated using Ohm's law.
Collecting electrode distance:
The correct answer is option 'C', which states that the collecting electrode should be far away from the electrode under test for the measurement of earth resistance. This is because if the collecting electrode is too close to the electrode under test, it may affect the measurement due to the influence of the test current on the electrode. Therefore, proper distance between the electrodes is crucial for accurate measurement.
Factors affecting distance:
There are several factors that can affect the distance between the electrodes, including the size and shape of the electrodes, the depth of the test, and the soil resistance. In general, a distance of at least 20 times the depth of the electrode is recommended for accurate measurement.
Procedure:
The procedure for measuring earth resistance involves connecting the test electrode to the earth and injecting a test current into the earth. The voltage drop between the test electrode and the collecting electrode is then measured, and the earth resistance is calculated using Ohm's law.
Conclusion:
In conclusion, the correct distance between the electrodes is essential for accurate measurement of earth resistance. The collecting electrode should be far away from the electrode under test, and a distance of at least 20 times the depth of the electrode is recommended for accurate measurement. The procedure involves injecting a test current and measuring the voltage drop, and the earth resistance is calculated using Ohm's law.
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For the measurement of the earth resistance of a given earth electrode:a)Collecting electrode should be very near to the electrode under testb)Collecting electrode should touch the electrode under testc)Collecting electrode should be far way the electrode under testd)None of theseCorrect answer is option 'C'. Can you explain this answer?
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