Electrical Engineering - Transformers - Discussion

Discussion :: Transformers - General Questions (Q.No.5)

5. 

A certain transformer has 400 turns in the primary winding and 2,000 turns in the secondary winding. The turns ratio is

[A]. 0.2
[B]. 0.4
[C]. 5
[D]. 25

Answer: Option C

Explanation:

No answer description available for this question.

Tvsprasad said: (Dec 6, 2010)  
Turns ratio=n2/n1,
so N2/N1=2000/40=5

Mahesh said: (Feb 9, 2011)  
Turns Ratio = N2/N1 , So N2/N1 = 2000/400 = 5

Sandhya said: (May 5, 2011)  
2000/400=5
because,
turns ratio=n2/n1

Yasin said: (Jun 7, 2011)  
We know T/F ratio
k=n2/n1
so 2000/400=5
Ratio=5

Ranchod Gurjar said: (Jul 17, 2011)  
Turn ratio k=n2/n1=e2/e1=i1/i2

n2/n1=2000/400=5

Pawan said: (Aug 31, 2011)  
We know that:- Turn ratio=N2/N1;

HERE N2=2000;
N1=400;
T.R=2000/400=5

Raghavendra said: (Oct 24, 2011)  
I think its wrong because turns ratio is different from transformation ratio transformation ratio k=1/n=V2/V1=I1/I2

K.Bhanu Chandar said: (Oct 24, 2011)  
n=v2/v1
n=2000/400
n=5

Mahendra said: (Nov 26, 2011)  
Transformer ratio is always mention in the form of N1/N2 so I suppose that the answer should be 0.2 because N1 showing primery & N2 is secondary. If answer is 5 than 2000 should be primary & 400 should be secondary.

Tanul said: (Dec 3, 2011)  
Turn ratio =N2/N1 or V2/V1.
As given
N2=2000
N1=400
so-
2000/400 = 5 ans.

Punyashree said: (Dec 26, 2011)  
trasformation ratio,k=N2/N1
turns ratio=1/k= N1/N2

K.Karthik said: (Dec 31, 2011)  
k=n2/n1
k=2000/400=5

Sainaz said: (Jan 6, 2012)  
Primary turns (n1) =400.

Secandary turns (n2) =2000.

Turns ratio (k) = n2/n1.

=2000/400.

Ans=5.

Jyothi said: (Feb 28, 2012)  
How can we say the answer is 5 ? Because in this problem you are mentioned primay is 400,secondary is 2000.

So my answer is turns ratio is 0.2 .

Here somebody said the answer is 5. They mentioned clearly in the problem primary turns is 400, secondary turns is 2000.

Please tell the reason clearly.

Manish said: (Mar 21, 2012)  
TURN RATIO FORMULA=SECONDARY TURNS(N2)/PRIMARY TURNS(N1).
SO, VALUE OF N2=2000 AND VALUE OF N1=400.
=>N2/N1
=>2000/400=5. THIS IS ANS.

Rupesh Das said: (Apr 7, 2012)  
Primary turns(N1)=400
Secondary turns(N2)=2000
Turn Ratio(K)=N2/N1
=>2000/400=5.
This Is Ans

Krishna Teja said: (May 5, 2012)  
But actually the formula for turns ratio is N1/N2 so the answer will be 0.2.
Please reply why all taken it as N2/N1.

Naveen said: (May 12, 2012)  
so much confusion in the formula
Turn ratio is N1/N2 or N2/N1.
you have tried both the formula in two questions given here.

Gaurav Garg said: (Jun 18, 2012)  
We know turn ratio = (turn on h. V) / (turn on l. V).

So,

Turn ratio = 2000/400.

Turn ratio = 5.

A.Veeravanchinathan said: (Jul 18, 2012)  
Transformation ratio = Vs/Vp = Es/Ep = Ns/Np = Ip/Is.
= Ns/Np = 2000/400 = 5.

Venky said: (Aug 22, 2012)  
Here [always] turns ratio is H.V/L.V side

Cks said: (Aug 24, 2012)  
turns ratio =h.v(less current ,more turns)/l.v(more current, less turns)=2000/400=5

Avanish said: (Oct 6, 2012)  
Difference between turn and voltage ratio.

Vaibhav Sudhan said: (Feb 8, 2013)  
Secondary turns divided by the primary turns gives turn ratio.

N2/N1 = turn ratio.

2000/400 = 5.

Vinod Bagodariya said: (Apr 4, 2013)  
Turns ratio = N2/N1.
N2 = 2000.
N1 = 400.

T.R = N2/N1 = 2000/400 =5.

Narendra Singh said: (Apr 20, 2013)  
When we find the single voltage and number of turn then we use Vp/Vs = Np/Ns.

But when we find the voltage or turn ratio it will reverse.

Voltage ratio = Vs/Vp.

Turn ratio = Ns/Np.

Tori said: (Apr 30, 2013)  
We know transformation ratio to be NP/NS=VP/VS=IS/IP.

Now how come the answer is 5 instead of 0.2.

Please can you come out clear with your formuler explanation?

Yatish Ahire said: (Jun 1, 2013)  
We know That turns Ratio is inversely proportional to the secondary wdg. & primary wdg.

Turns ratio (K) = Secondary wdg(N2) / Primary wdg (N1).

K = 2000/400.

= 5.

Rajkumar said: (Jul 30, 2013)  
I remove your all confusion dears turn ration is always in the form of high voltage/low voltage it does not matter turn ratio is n1/n2 or n2/n1 we just take turn ratio is as the number of turns in high voltage side divided by no of turns in low voltage side so the answer five is correct ok to all of you.

Bibash said: (Aug 17, 2013)  
This is all wrong turns ratio is N1/N2. So the answer is 0.2.

Bhairesh said: (Aug 30, 2013)  
What is the definition for transformer ratio and turns ratio?

Lalu Prasad Yadav said: (Mar 24, 2014)  
Transformer ratio is the ratio of avg. Of all turns ratio taken as sample of interval with 10 min in standard temperature, time and pressure. While length is always in ratio of velocity of square of light.

Ok. Got it?

Atul Kumar said: (Apr 22, 2014)  
Wrong. Because turns ratio is opposite to transformation ratio. Turns ratio = N1/N2 whereas N2/N1 is transformation Ratio.

Akash.Bhure said: (Apr 29, 2014)  
Solution:

No.of turns in the primary (N1) = 400.
No.of turns in the secondary (N2) = 2000.
Turns ratio(K) = N2/N1 = 2000/400 = 5.

Madan Padmere said: (Aug 26, 2014)  
No.of turns in the primary (N1) = 400.

No.of turns in the secondary(N2) = 2000.

Turns ratio = N2/N1 = 2000/400 = 5.

Akash Niranjan said: (Oct 24, 2014)  
Turns ratio k = n2/n1.

n2 = 2000, n1 = 400 now k = 2000/400.

So k = 5.

Manikya Singh said: (Dec 27, 2014)  
N2/N1 = 2000/400 = 5/1.

So answer is 5.

Halwar Dattatray said: (Jan 8, 2015)  
n2 = 2000.
n1 = 400.

We know,

k = n2/n1.
k = 2000/400.
k = 5.

Andy said: (Jan 19, 2015)  
Turn ratio = n = vp/vs.
400/2000 = 0.2.

Uma Rani Panda said: (Feb 1, 2015)  
We know,

Ratio = n2/n1 [k = n2/n1].

Than, k = 2000/400.

k = 5.

So, ratio is 5.

K.Hanumantha said: (Feb 3, 2015)  
Hi guys this is wrong right.

Because N1/N2 = 'n' this is turns ratio.

So answer is = 0.2. How it comes 5?

Transformer ratio is N2/N1 = V2/V1 = I1/I2 = K this is transformer ratio.

In the question they are clearly ask Turns ratio. Then how it comes this answer. Please due to that am confused in one of my Exam. So please tell clearly any one.

NI/N2 = 'n' turns ratio.

N2/N1 = K, this is transformer ratio.

Ramesh Kumar Banjare said: (Feb 15, 2015)  
Hi friends this answer is wrong because,

Turn ratio = N1/N2.

= 400/2000 = 0.2.

A.Rakesh said: (Feb 17, 2015)  
Answer must be 0.2.

Transform ratio (N2/N1 = V2/V1 = I1/I2), turn ratio different (N1/N2).

Pooja said: (Feb 20, 2015)  
V1/V2 = N1/N2 = E1/E2 = a.

Where 'a' is turns ratio.

400/2000 = 0.2.

Vijay said: (Mar 10, 2015)  
N2/N1 is a transformation ratio.

Hence obviously 2000/400 = 5.

Shailesh said: (Mar 21, 2015)  
Turns ratio = n1/n2 = 400/2000 = 0.2.

Transformation ratio = n2/n1.

Here turns ratio is asked not transformation ratio.

Nikilesh said: (Jun 24, 2015)  
Answer is 0.2 only or else Tell me the difference between turns ratio and transformation ratio.

Mayur said: (Aug 19, 2015)  
I think the answer must be 0.2 as we N1=400 and N2=2000 so the ration should be 1/5 not 5/1.

Balaji said: (Sep 24, 2015)  
Even I think the answer should be 0.2 as turns ratio indicate primary to secondary turns of transformer.

So here it is 400/2000 = 0.2.

If someone feels wrong please explain clearly.

Sachin Sharma said: (Dec 5, 2015)  
As we know that the transformer turn ratio N2/N1 so that 2000/400 = 5 so answer is C correct.

R D Vashishta said: (Dec 11, 2015)  
Transformer ratio = K = N2/N1.
K = 2000%400 = 5.

Muhammad Muneer said: (Jan 17, 2016)  
This answer is wrong because for step-up transformer turn ratio a<1, for step-down transformer turn ratio a>1. The turn ratio is N1/N2, answer is 0.2.

Sharad Pawar said: (Jan 28, 2016)  
Definition of the turns ratio of transformer is n1/n2 and not n2/n2.

So turns ratio is n1/n2 = 400/2000 = 1/5 = 0.2.

Venky said: (Feb 29, 2016)  
Definition of turn ratio is N1/N2.

Hyacinth Salim said: (Mar 29, 2016)  
Dear,

Turns ratio n = n1/n2, so answer is 0.2.

But, transformation ratio, voltage ration k = v2/v1 proportional.

Step up transformer - turns ratio less than 1.

Step down trfr - turns ratio greater than 1.

Matching transformer - turns ratio = 1.

But voltage transformation ratio is the other way step up - greater than 1, step down - less than 1.

Hope above is clear.

Chaitanya Patel said: (Apr 29, 2016)  
Transformation Ratio = E2/E1 = v2/v1 = N2/N1 = k.

Turn Ratio = E1/E2 = V1/v2 = N1/N2 = 1/k.

So, Turn Ratio 1/k = N1/N2 = 400/2000 = 0.2.

So , the answer should be 0.2.

Arjun Roy said: (May 21, 2016)  
As per my knowledge turn ratio= n1/n2.
Transformation ratio = n2/n1.

So, as per formula the ans will be 0.2.

Kirthi Arora said: (Jun 21, 2016)  
Turn ratio is define as ratio of turns of wire in the primary winding to its secondary winding. So Turn ratio = Np/Ns => 400/2000 = 0.2.

Izaz said: (Jun 28, 2016)  
Turns ratio (a) = N1/N2.

Transformation ratio (k) = V2/V1 =N2/N1 = I1/I2.

So answer should be 0.2.

Please don't interchange d meaning of. Tuns ratio and transformation ratio.

Chilufya said: (Jul 15, 2016)  
turn ratio = n1/n2
n1 = 400,
n2 = 2000,
.'. 400/2000 = 0.2.

Deepak Kumar said: (Aug 23, 2016)  
Turns ratio k = E2/E1,

= 2000/400 = 5.

Selvan P said: (Oct 27, 2016)  
Why not primary/secondary i.e. 400/2000?

Ayyubkhan said: (Feb 6, 2017)  
Transformer primary side = 400turns.
Transformer secondary side = 2000 turns.

Calculate transformer ratio?
Transformer ratio(k) = n2/n1,
= 2000/400.
Transformer ratio(k) = 5.

Ankit said: (Feb 12, 2017)  
Turn ratio =N1/N2 and transformation ratio=N2/N1.
Turn ratio=400/2000 = 0.2.

Amani Naidu said: (Feb 15, 2017)  
Turns ratio and transformation ratio both are different. So this answer is wrong.

Ashok Kumar said: (Feb 20, 2017)  
Turns ratio is N1/N2.
Transformation ratio is N2/N1.
So, the answer is 0.2.

Akshay Sontakke said: (Mar 14, 2017)  
Turns Ratio = Np/Ns.
It depends upon how the winding is connected.
In the given question,
Np = 400.
Ns = 2000.

Hence, Np/Ns= 400/2000 = 0.2.
So the turn Ratio is 0.2.

Teja said: (May 22, 2017)  
N1/N2 =400/2000 = 0.2.

Correct answer
N2/N1 = transformation ratio.

Zuber Nadaf said: (Jun 9, 2017)  
It's wrong turn ratio =n1/n2.
So, answer = 0.2.

Janardan said: (Jul 13, 2017)  
This is wrong because turns ratio different from transformation ratio.
Transformation ratio = k = n2/n1.
Turns ratio =1/k=n1/n2.

Sachin Chaudhary said: (Aug 5, 2017)  
I agree @Rajkumar.

Second thing is that they can never be fractional it is always integral.

Stoyan said: (Dec 22, 2017)  
The answer is wrong. "Transformation ratio" and "turns ratio" are one and the same thing, the formula is N1/N2 = V1/V2 = I2/I1.

The answer is k = 400/2000 = 0.2.

Ramu said: (Jan 6, 2018)  
Actually, the turns ratio means n1/n2 so 400/2000=0.2.

The ans 5 i.e 2000/400 for transformation ratio=n2/n1.

Himanshu said: (Jan 16, 2018)  
The answer is n1/n2 i.e 0.2.

Ashok Reddy said: (Feb 3, 2018)  
The turns ratio=n1/n2.
400/2000=0.2.

Sai said: (Feb 15, 2018)  
The Answer is 0.2.

Sunayana said: (Feb 24, 2018)  
Answer is 0.2.
Turns ratio is n1/n2.
Transformation ratio is n2/n1.

Balu said: (Mar 3, 2018)  
Turns ratio N1/N2 & transformation ratio N2/N1.

S P said: (Mar 19, 2018)  
Turn Ratio:

It is defined as the ratio of primary to secondary turns.
TR= N1/N2.
and

Transformation Ratio
The transformation ratio is defined as the ratio of the secondary voltage(or turns) to the primary voltage(or turns). It is denoted by K.
K= (E2/E1) or (N2/N1) or (I1/I2).

Prabha said: (May 23, 2018)  
Turns ratio.

I think n1/n2 because transformation ratio is n2/n1 once you cross I agree @Jyothi.

Mudasser Rahim said: (Aug 18, 2018)  
The answer is wrong there is a difference between the turn ratio and transformation ratio.

So, the Answer should be 400/2000= 0.2.

Khademul Islam said: (Mar 31, 2019)  
Turn ratio is always N1/N2 which is always inverse of transformation ratio K & K=N2/N1.
Here the answer is 0.2.

Sangameshwar said: (Aug 28, 2019)  
1) Turns ratio in terms of number of turns is given by = higher number of turns/lower number of turns.

2) Turns ratio in terms of voltage is given by= low voltage/high voltage.

Sujeet Pandey said: (Sep 2, 2019)  
No, 400/2000= 0.2.is the correct answer.

Naveen said: (Jan 14, 2020)  
According to IEEE, the turn ratio is defined as the ratio of HV to LV. The definition says nothing about primary or secondary.


HV side will be the side with greater no. of turns and LV side will be the side with fewer no. of turns.
therefore, a=HV/LV.

i.e 2000/400=5.

Sowmya said: (Jan 17, 2020)  
Turns ratio = n1/n2 = 400/2000 = 0.2.
Transformation ratio = n2/n1.

Here turns ratio is asked not transformation ratio.

Post your comments here:

Name *:

Email   : (optional)

» Your comments will be displayed only after manual approval.