
16. S&T earthing
Authored by CDC - COMPETENCY DEVELOPMENT CENTRE
Professional Development
Professional Development
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Moisture must be maintained at least
20%
30%
40%
50%
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Diameter of the pipe in earthing must be more than
28 mm
30 mm
32 mm
34 mm
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of these are included in earthing?
Pipe Earthing
Maintenance free Earthing
Plate Earthing
All of the above
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Length of GI Pipe in pipe earthing
3 mtr
5 mtr
6 mtr
8 mtr
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Excavated pit around the G.I pipe is filled with salt and coal mixture
True
False
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Size of copper plate used in plate earthing
1200 mm x 1200 mm x 3 mm
1200 mm x 1200 mm x 5 mm
1200 mm x 1200 mm x 7 mm
1200 mm x 1200 mm x 9 mm
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Diameter of the earth electrode in maintenance free earthing
17 mm
19 mm
21 mm
23 mm
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