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Transmission & Distribution

Transmission & Distribution
A conductor, due to sag between two supports, takes the form of

Ellipse
Triangle
Catenary
Semicircle

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Transmission & Distribution
In a 3 wire dc system, the current in +ve outer is 200 A and in the -ve outer is 100 A. The current in the neutral wire is

100 A
300 A
0 A
200 A

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Transmission & Distribution
Which of the following equipment is used to limit short circuit level in a substation?

Series reactor
Lightning switch
Coupling capacitor
isolator

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Transmission & Distribution
The cause of damage to the lead sheath of a cable is

mechanical damage
all of these
crystallisation of the lead through vibration
chemical action on the lead when buried in the earth

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Transmission & Distribution
220 kV transmission line voltage is economical for a distance of

100 km
400 km
200 km
22 km

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Transmission & Distribution
In india, secondary distribution is carried out at

600/300 V
None of the listed here
700/350 V
400/230 V

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