A power transmission line feeds input power at 2400 V to a step down transformer with its primary windings having 4000 turns. What should be the number of turns in the secondary windings in order to get output power at 240 V ?

Question

A power transmission line feeds input power at 2400 V to a step down transformer with its primary windings having 4000 turns. What should be the number of turns in the secondary windings in order to get output power at 240 V ? (A) 400 (B) 420 (C) 424 (D) 436

Tardigrade Admin · Accepted Answer

( E s / E p )=( N s / N p ) E p =2400 N p =4000 E s =240 N s =? (240/2400)=( N s /4000) N s =400

Q. A power transmission line feeds input power at $2400 V$ to a step down transformer with its primary windings having $4000$ turns. What should be the number of turns in the secondary windings in order to get output power at $240 V$ ?

$400$

$420$

$424$

$436$

$\frac{E _{s}}{E _{p}} = \frac{N _{s}}{N _{p}}$
$E_{p} = 2400$
$N_{p} = 4000$
$E_{s} = 240$
$N_{s} = ?$
$\frac{240}{2400} = \frac{N _{s}}{4000}$
$N_{s} = 400$

Q. A power transmission line feeds input power at 2400V to a step down transformer with its primary windings having 4000 turns. What should be the number of turns in the secondary windings in order to get output power at 240V?

400

420

424

436