A step down transformer converts transmission line voltage from 11000 V to 220 V. The primary of the transformer has 6000 turns and efficiency of the transformer is 60 %. If the output power is 9 kW, the number of turns in the secondary is

Question

A step down transformer converts transmission line voltage from 11000 V to 220 V. The primary of the transformer has 6000 turns and efficiency of the transformer is 60 %. If the output power is 9 kW, the number of turns in the secondary is (A) 20 (B) 80 (C) 120 (D) 160

Tardigrade Admin · Accepted Answer

As, (Vs/Vp)=(Ns/Np) ⇒ Ns=(Vs/Vp)× Np =(220/11000)×6000 =120

Q. A step down transformer converts transmission line voltage from $11000 V$ to $220 V$ . The primary of the transformer has $6000$ turns and efficiency of the transformer is $60 %$ . If the output power is $9 kW$ , the number of turns in the secondary is

$20$

$80$

$120$

$160$

As, $\frac{V _{s}}{V _{p}} = \frac{N _{s}}{N _{p}} \Rightarrow N_{s} = \frac{V _{s}}{V _{p}} \times N_{p}$
$= \frac{220}{11000} \times 6000$
$= 120$

Q. A step down transformer converts transmission line voltage from 11000V to 220V. The primary of the transformer has 6000 turns and efficiency of the transformer is 60%. If the output power is 9kW, the number of turns in the secondary is

20

80

120

160