Electrical Engineering - Transformers - Discussion
Discussion Forum : Transformers - General Questions (Q.No. 7)
7.
To step 110 V ac down to 20 V ac, the turns ratio must be
Answer: Option
Explanation:
Vp/Vs = Np/Ns
Vs = (Ns/Np)Vp
We required turns ratio i.e., (Ns/Np)
= Vs/Vp
= 20/110
= 0.181818182
[Note: p - primary; s - secondary]
For step down transfer, the turns ratio will be less than 1.
For simulation: Step-Down Transformer Circuit Simulator.
Discussion:
29 comments Page 2 of 3.
Pppp said:
10 years ago
Turns ratio formula is n2/ne and the answer is 5.5.
(1)
Masroor said:
10 years ago
As the t/f is step down t/f, so the secondary is 20 V & the primary is 110 V.
And according to formula:
Ns/Np=Vs/Vp.
Ns/Np=20/110.
Hence; Ns/Np=0.18.
And according to formula:
Ns/Np=Vs/Vp.
Ns/Np=20/110.
Hence; Ns/Np=0.18.
Lavkesh said:
10 years ago
n2/n1 = v2/v1 and i1/i2.
But here we required only n2/n1 = 20/110 = 0.18.
But here we required only n2/n1 = 20/110 = 0.18.
Vinit Ghone said:
1 decade ago
What is the main turns ratio? Am way to confused. Please help me. What's is the relation v2/v1 = i1/i2 = n2/n1 or what?
Dave said:
1 decade ago
The correct answer is 5.5 : 1 The turns ratio is based on the number of turns primary to secondary, the higher the voltage the more turns you have 110/20 = 5.5.
You have 5.5 turns to every 1 turn. Your voltage per turn is the same on your primary and secondary. On your primary you have more turns.
You have 5.5 turns to every 1 turn. Your voltage per turn is the same on your primary and secondary. On your primary you have more turns.
Sainath goud said:
1 decade ago
Turns ratio is N1/N2.
We know that N1/N2 = V2/V1.
N1/N2 = 20/110 = 2/11 = 0.181.
We know that N1/N2 = V2/V1.
N1/N2 = 20/110 = 2/11 = 0.181.
Bharath reddy said:
1 decade ago
I'm confused 0.18, 5.5 I think correct answer 0.18.
Akash.bhure said:
1 decade ago
Solution:
Primary voltage(V1) = 110V.
Secondary voltage(V2) = 20V.
Turns ratio(K) = N2/N1 = V2/V1.
(K) = 20/110 = 0.18.
Primary voltage(V1) = 110V.
Secondary voltage(V2) = 20V.
Turns ratio(K) = N2/N1 = V2/V1.
(K) = 20/110 = 0.18.
Vivek prasad said:
1 decade ago
According to IEEE, Turns ratio = high voltage turns / low voltage turns
So turn ratio = 110 / 20 = 5.5.
So turn ratio = 110 / 20 = 5.5.
Amarjyoti Sarmah said:
1 decade ago
Can anyone correctly give the definition of Turns ratio & Transformation ratio? Is both are the same or inverse to each other? I am very much confused for this two ratios? the above solutions are very much confused. So please help me?
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