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:
30 comments Page 2 of 3.
Chaitanya said:
9 years ago
What is turns ratio formula? Please, can you help me?
Amani naidu said:
9 years ago
n2/n1 is the transformation ratio.
n1/n2 is the turns ratio.
n1/n2 = v2/v1.
So, the answer is 0.1818.
n1/n2 is the turns ratio.
n1/n2 = v2/v1.
So, the answer is 0.1818.
Pintu kumar said:
10 years ago
I am confused please give me the correct answer.
Masroor said:
1 decade 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:
1 decade 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.
Rajashekhar said:
2 decades ago
When I solved this problem am getting as 5.5 value. Kindly confirm me.
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.
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