D:-vibration
Correct Answer:- Option-B
Question87:-The frequency of electricity supply in India is
A:-60 Hz
B:-45 Hz
C:-55 Hz
D:-50 Hz
Correct Answer:- Option-D
Question88:-The size of copper plate used in plate earthing system is
A:-60 cm x 60 cm x 3.15 mm
B:-60 cm x 60 cm x 6.3 mm
C:-30 cm x 30 cm x 3.15 mm
D:-60 cm x 60 cm x 3.3 mm
Correct Answer:- Option-A
Question89:-One Webber is equal to ____ Maxwell.
A:-10000
B:-100000
C....
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