Electrical Engineering - Transformers - Discussion
Discussion Forum : Transformers - General Questions (Q.No. 13)
13.
A certain transformer has a turns ratio of 1 and a 0.85 coefficient of coupling. When 2 V ac is applied to the primary, the secondary voltage is
Discussion:
22 comments Page 1 of 3.
Ram Krishna said:
10 years ago
There are two losses in transformer:
1. Core loss/iron loss-it is due to current and current is measured in ampere.
2. Winding/copper loss- it is due to voltage and unit of voltage is volt.
That means total loss-core-loss and copper loss.
So VA (volt ampere).
Kilo is introduced due to heavy current measured. That's a bigger unit. So, KVA.
Its clear, thanks.
1. Core loss/iron loss-it is due to current and current is measured in ampere.
2. Winding/copper loss- it is due to voltage and unit of voltage is volt.
That means total loss-core-loss and copper loss.
So VA (volt ampere).
Kilo is introduced due to heavy current measured. That's a bigger unit. So, KVA.
Its clear, thanks.
ROOPESH D M said:
1 decade ago
We know that turns ratio = K = (N2/N1) = (V2/V1).
K = 1.
V1 = 2V.
Therefore V2 = V1*K = 2*1 = 2V.
But the coefficient of coupling is 0.85.
It indicates that only 85% of flux is linking to secondary, from primary.
So 2V*0.85 = 1.7 V.
K = 1.
V1 = 2V.
Therefore V2 = V1*K = 2*1 = 2V.
But the coefficient of coupling is 0.85.
It indicates that only 85% of flux is linking to secondary, from primary.
So 2V*0.85 = 1.7 V.
Shahid said:
4 years ago
K =V2/V1=N2/N1=1, V1=2
V2=K*V1= 1 * 2 = 2v.
The coefficient of coupling = .85 =85*1/100= 85%
That mean 85% primary Flux passes through secondary.
So, 85% secondary Volts, V2=0.85*2=(85/100)*2 = 1.7v
V2=K*V1= 1 * 2 = 2v.
The coefficient of coupling = .85 =85*1/100= 85%
That mean 85% primary Flux passes through secondary.
So, 85% secondary Volts, V2=0.85*2=(85/100)*2 = 1.7v
(3)
Pmc said:
1 decade ago
Voltage induce in a transformer = (coeff. of coupling)*(ideal v).
Normally we take coefficient of coupling as 1.
But here it is mentioned as 0.85.
= 0.85*2.
= 1.7.
Normally we take coefficient of coupling as 1.
But here it is mentioned as 0.85.
= 0.85*2.
= 1.7.
Somnath said:
1 decade ago
@sheila & @poo.
The COEFFICIENT OF COUPLING of a transformer is dependent on the portion of the total flux lines that cuts both primary and secondary windings.
The COEFFICIENT OF COUPLING of a transformer is dependent on the portion of the total flux lines that cuts both primary and secondary windings.
Yerra said:
1 decade ago
Voltage induced =coefficent of coupling*voltage caliculated
if itwas not given we will simply take it as 1
v2/v1=n2/n1=1
v2=v1=2
Voltage induced = 2*.85 = 1.7v
if itwas not given we will simply take it as 1
v2/v1=n2/n1=1
v2=v1=2
Voltage induced = 2*.85 = 1.7v
Bipradas Ghosh said:
1 decade ago
The COEFFICIENT OF COUPLING(M) of a transformer is dependent on the portion of the total flux lines that cuts both primary(L1) and secondary(L2) windings.
MANGALA PRASAD §VASU§ said:
1 decade ago
Sorry. I made a blunder.
Actually, Current in transformer ckt is inversely proportional to voltage.
Why the correct option is (B).
Actually, Current in transformer ckt is inversely proportional to voltage.
Why the correct option is (B).
Subhransu said:
1 decade ago
According to transformation ratio E2/E1=N2/N1=K.
So E2/2=1=.85.
E2=2*.85=1.7V.
So E2/2=1=.85.
E2=2*.85=1.7V.
Kayam venu said:
4 years ago
Option (A) is correct.
Turns ratio=1
Co-efficient=0.85.
o/p vol tage = 2 * 0.85 = 1.7v.
Turns ratio=1
Co-efficient=0.85.
o/p vol tage = 2 * 0.85 = 1.7v.
(3)
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