# Electrical Engineering - Transformers - Discussion

### Discussion :: Transformers - General Questions (Q.No.24)

24.

A transformer has a 1:6 turns ratio and a secondary coil load resistance of 470 . The load resistance as seen by the source is

 [A]. 1.3 [B]. 7.8 [C]. 78 [D]. 13

Explanation:

No answer description available for this question.

 Durgaprasad said: (Apr 15, 2011) K=N2/N1 K=6/1=6 R1=470 R2=R1/(K^2) SO 470/36=13.06OHMS

 Siva said: (Feb 29, 2012) n1/n2=(r1/r2)^2

 Darwin said: (May 17, 2012) Given, N(pri):N(sec) = 1:6 R = 470 ohm So, Relective Resistance = [(1/n)^2]*R = 470/36 = 13.055 Where, n = N(sec)/N(pri) = 6

 Patil said: (Jun 19, 2015) Is transformer ratio always N2/N1?

 Kazi Jasimuddin said: (Sep 8, 2015) If the relation between turns ratio and resistance is n1/n2=sqrt (r1/r2) then answer will be 78.

 Basu Patil said: (Mar 5, 2016) Thank you lot indiabix. Friends I have doubt, is transformer ratio is constant or not? because I have seen. Two types i.e. N2/N1 And N1/N2. Which one is correct ? please clear my confusion.

 Sudhir said: (Apr 9, 2016) Zin or Zsource = ZL(load impedance)/n^2. Here n is turned ratio.

 Susanta said: (Sep 14, 2016) Transformatio ratio(k) = N2/N1. Turns ratio(n) = N1/N2. therefore, n = 1/k. Don't be confused between transformation ratio & turns ratio.

 Kuna said: (Dec 10, 2016) The turn ratio n1/n2 =√ (r2/r1) = 13.

 Lakshman Rao said: (Jan 24, 2017) But they mentions turns ratio as 1:6. We are taken turns ratio in transformer n2/n1. So where n2 = 1 and n1 = 6. Then what happen? Please explain.

 Sai Kumar said: (May 17, 2017) @Lakshman Rao. That is transformation ratio = k. Turns ratio = N1/N2. Transformation ratio N2/N1 = k.

 Narasimha Reddy said: (May 27, 2017) I totally confused. Is it n1/n2 or n2/n1?

 Walid said: (Aug 4, 2018) Guys it's turns ratio so n1/n2 =1/6 = 0.16. And R1=R2*(turns ratio)^2 =470 * 0.025 = 13.

 Majid Mahmood said: (Aug 19, 2019) @Reddy. 1/6 = 0.166. When ratio is less than one mean step up use v2/v1 otherwise use v1/v2.