Previous Year Question
If an underground cable system uses a galvanized iron pipe driven into moist soil for safety, which type of earthing is being applied?
Correct answer: C
Explanation
Pipe earthing uses a perforated or suitable GI pipe electrode driven vertically into moist soil to obtain a low-resistance connection to earth. The description therefore directly identifies pipe earthing.
Step-by-step solution
Correct Answer
C — Pipe earthing
Explanation
Pipe earthing uses a perforated or suitable GI pipe electrode driven vertically into moist soil to obtain a low-resistance connection to earth. The description therefore directly identifies pipe earthing.
Key Concept
Pipe Earthing
Exam Point
GI pipe driven into soil = pipe earthing.
Exam tip
GI pipe driven into soil = pipe earthing.
Quick method
GI pipe driven into soil = pipe earthing.