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

Answer: Option D

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.

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