engineering recuitment PGCIL Junior Technician Trainee (Electrician) Mock Test 2023 Electrician and Wireman Power Systems Earthing

प्लेट भूयोजन के लिए पृथ्वी में गड्ढा ______से कम नहीं होना चाहिए।

1
4.0 m
2
2.0 m
3
5.0 m
4
3.0 m
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