Electrical Engineering - Transformers - Discussion
Discussion Forum : Transformers - General Questions (Q.No. 14)
14.
The primary coil of a transformer is connected to a 60 V ac source. The secondary coil is connected to a 330 
load. The turns ratio is 3:1. What is the secondary voltage?
load. The turns ratio is 3:1. What is the secondary voltage?Discussion:
27 comments Page 1 of 3.
Preeti Hazarika said:
1 decade ago
Case1: For step down transformer, primary has more turns than secondary.
Thus N2=1 & N1=3, So Turns ratio, N2/N1=1/3.
In that way Option B is correct.
Case 2: For step up transformer, N2/N1=3/1,
In this case option C will be correct.
In this question volt drop is there due to resistance thus 1st case seems valid.
Thus N2=1 & N1=3, So Turns ratio, N2/N1=1/3.
In that way Option B is correct.
Case 2: For step up transformer, N2/N1=3/1,
In this case option C will be correct.
In this question volt drop is there due to resistance thus 1st case seems valid.
Sriram said:
1 decade ago
@Rohinthh.
If the transformer ratio is given as 3:1 then it is n1:n2,
If the transformer Ratio is 3 or any other no. given as single digit then we have to consider n2:n1.
I think you're clear with my suggestion, have a wonderful day.
If the transformer ratio is given as 3:1 then it is n1:n2,
If the transformer Ratio is 3 or any other no. given as single digit then we have to consider n2:n1.
I think you're clear with my suggestion, have a wonderful day.
Punnam chander said:
1 decade ago
N1:N2 = 3:1.
R-L = 330 ohms.
N2/N1= 1/3.
N2/N1= V2/V1.
V2 = 20 but this one is not answer he asking about across the R-L.
So, V2 = (I)(R-L).
I = V2/RL = 20/330.
I = 2/33.
V2 = (2/33)*(330) = 20.
R-L = 330 ohms.
N2/N1= 1/3.
N2/N1= V2/V1.
V2 = 20 but this one is not answer he asking about across the R-L.
So, V2 = (I)(R-L).
I = V2/RL = 20/330.
I = 2/33.
V2 = (2/33)*(330) = 20.
Er.Pratikkumar said:
8 years ago
@All.
Please remember the turns ratio is always N2/N1.
There is no in any book given that if ratio is single digit then N1/N2 & if ratio is like 3:1 then N2/N1.
So, it's N2/N1 that's all.
Please remember the turns ratio is always N2/N1.
There is no in any book given that if ratio is single digit then N1/N2 & if ratio is like 3:1 then N2/N1.
So, it's N2/N1 that's all.
(1)
Ajh said:
8 years ago
Turns ratio = n2/n1 = n2:n1. In question it is clearly given turns ratio is 3:1... it mean n2 = 3 & n1 = 1.
Wkt ,
n2 / n1 = v2/v1,
3 / 1 = v2/60,
V2 = 60 * 3 = 180.
Wkt ,
n2 / n1 = v2/v1,
3 / 1 = v2/60,
V2 = 60 * 3 = 180.
Mukesh said:
1 decade ago
Since turn ratio is 3:1, means k>1 so this is step down transformer. Primary has 60v so the secondary should low voltage than primary that's why 60/30 = 20v.
Pranay said:
1 decade ago
Here,
Turn ratio = 3:1 means
n1 = 3, n2 = 1,
v1 = 60
Turn ratio = k = 3:1 = n1/n2 = v1/v2
so, v1 is 3 times higher than v2
v1 is 60 then v2 must be 20 = 60/3.
Turn ratio = 3:1 means
n1 = 3, n2 = 1,
v1 = 60
Turn ratio = k = 3:1 = n1/n2 = v1/v2
so, v1 is 3 times higher than v2
v1 is 60 then v2 must be 20 = 60/3.
ROHINTHH said:
1 decade ago
How to decide that whether the turns ratio given is N2/N1 or N1/N2?
I thought N2/N1 = 3/1.
SO N2/N1 = E2/E1 = 3/1.
Hence E2 = 3*60 = 180V.
Please explain?
I thought N2/N1 = 3/1.
SO N2/N1 = E2/E1 = 3/1.
Hence E2 = 3*60 = 180V.
Please explain?
Priyanka said:
3 years ago
Look at the ratio. It's greater than 1.
It means it's a step-down t/f. So, try both ways. In whichever way the secondary V has a smaller value.
It means it's a step-down t/f. So, try both ways. In whichever way the secondary V has a smaller value.
ANUPAM ANAND said:
9 years ago
Sometimes you take turn ratio means n1/n2 & sometimes you take n2/n1. So tell me that what is actual means of turn ratio?
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