PVC conduits can be joined by
threading
welding
solvent cement
any of the above.
any of the above.
The maximum horse power up to which 440 V electric motors are used is
50 HP
20 HP
200 HP
10 HP.
200 HP
The earthing electrode should be situated at a place at least .......... meters away from the building whose installation system is being earthed
1.5 m
100 m.
25 ma
3.5 m
1.5 m
Which of the following mixture is preferred for filling around the earth electrode effective earthing ?
coal salt mixture
saw dust sand mixture
bone meal mixture
lime-stand mixture.
coal salt mixture
Inside the earth or pit the earthing electrode should be placed
inclined at any angle other than 450.
vertical
horizontal
inclined at 450
vertical
Danger 440 V plates are
caution notices
danger notices
advisory notices
informal notices.
caution notices
The minimum clearance of any overhead line from the ground should be
4 m.
10 m
20 m
6 m
6 m
Earthing of electric appliances is done
for the safety of human life
to reduce line voltage fluctuation
for all of the above.
for protection of electric equipment
for all of the above.
Earthing is used as the return conductor for
all of the above.
traction work
telegraph lines
telephone lines
all of the above.
The resistance of earth wire should be
very low.
high
infinite
reasonable
very low.
पोस्ट अच्छी लगी हो तो प्लीज नीचे दिए गए लिंक पर क्लिक कर शेयर जरुर करें
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