Electrical Engineering (EE) Exam > Electrical Engineering (EE) Questions > Earth resistance comprises ofA. Resistance of...
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Earth resistance comprises of
A. Resistance of soil away from electrode
B. Contact resistance between electrode and soil
C. Resistance of metal electrode
- a)A only
- b)A and B only
- c)A and C only
- d)A, B and C together
Correct answer is option 'D'. Can you explain this answer?
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Earth resistance comprises ofA. Resistance of soil away from electrode...
The resistance offered by the earth electrode to the flow of current into the ground is known as the earth resistance or resistance to earth. It comprises of
1) Resistance of soil away from electrode
2) Contact resistance between electrode and soil
3) Resistance of metal electrode
Most Upvoted Answer
Earth resistance comprises ofA. Resistance of soil away from electrode...
Understanding Earth Resistance
Earth resistance is a crucial factor in electrical engineering, particularly for grounding systems. It comprises several components that contribute to the overall resistance encountered when establishing a grounding connection.
Components of Earth Resistance
- A. Resistance of soil away from electrode:
This refers to the inherent resistance of the soil surrounding the grounding electrode. The soil's resistivity can vary based on moisture content, temperature, and mineral composition, affecting how well electrical currents can disperse into the ground.
- B. Contact resistance between electrode and soil:
This is the resistance that occurs at the interface where the grounding electrode makes contact with the soil. It can be influenced by factors such as the electrode's surface condition and the soil type. Poor contact can lead to higher resistance, compromising the effectiveness of the grounding system.
- C. Resistance of metal electrode:
The material and dimensions of the grounding electrode itself also play a significant role. Different metals have varying resistivities, and the physical properties of the electrode (like corrosion) can affect its ability to conduct electricity.
Conclusion: Why Option D is Correct
When assessing earth resistance, all three components (A, B, and C) must be considered. Each factor contributes uniquely to the total resistance experienced by the grounding system. Neglecting any one of them could lead to inadequate grounding, potentially resulting in safety hazards or equipment malfunctions.
Thus, the correct answer is option 'D': A, B, and C together. Understanding these components is essential for designing effective grounding systems in electrical installations.
Earth resistance is a crucial factor in electrical engineering, particularly for grounding systems. It comprises several components that contribute to the overall resistance encountered when establishing a grounding connection.
Components of Earth Resistance
- A. Resistance of soil away from electrode:
This refers to the inherent resistance of the soil surrounding the grounding electrode. The soil's resistivity can vary based on moisture content, temperature, and mineral composition, affecting how well electrical currents can disperse into the ground.
- B. Contact resistance between electrode and soil:
This is the resistance that occurs at the interface where the grounding electrode makes contact with the soil. It can be influenced by factors such as the electrode's surface condition and the soil type. Poor contact can lead to higher resistance, compromising the effectiveness of the grounding system.
- C. Resistance of metal electrode:
The material and dimensions of the grounding electrode itself also play a significant role. Different metals have varying resistivities, and the physical properties of the electrode (like corrosion) can affect its ability to conduct electricity.
Conclusion: Why Option D is Correct
When assessing earth resistance, all three components (A, B, and C) must be considered. Each factor contributes uniquely to the total resistance experienced by the grounding system. Neglecting any one of them could lead to inadequate grounding, potentially resulting in safety hazards or equipment malfunctions.
Thus, the correct answer is option 'D': A, B, and C together. Understanding these components is essential for designing effective grounding systems in electrical installations.
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Earth resistance comprises ofA. Resistance of soil away from electrodeB. Contact resistance between electrode and soilC. Resistance of metal electrodea)A onlyb)A and B onlyc)A and C onlyd)A, B and C togetherCorrect answer is option 'D'. Can you explain this answer?
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