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Figure : Long distance power transmissio...


Figure : Long distance power transmissions The large-scale transmission and distribution of electrical energy over long distances is done with the use of transformers. The voltage output of the generator is stepped-up. It is then transmitted over long distances to an area sub station near the consumers. There the voltage is stepped down. It is further stepped down at distributing sub-stations and utility poles before a power supply of 240 V reaches our homes.
A power transmission line feeds input power. at 2300 V to a step down transformer with its primary windings having 4000 turns. The number of turns in the secondary in order to get output power at 230 V are :

A

4

B

40

C

400

D

4000

Text Solution

Verified by Experts

The correct Answer is:
C
Given `epsi_(0)=2300V`
`N_(P)=4000`
`epsi_(s)=230V`
Since `(N_(P))/(N_(s))=(epsi_(p))/(epsi_(s))`
`:. NS=(N_(p) epsi_(epsi))/(epsi_(s))=(4000xx230)/(2300)`
=400
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