# Electronics - Transformers - Discussion

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

5.

What is the turns ratio of the transformer needed to match a 1 k source resistance to a 160 load?

 [A]. 2.5:1 [B]. 0.4:1 [C]. 6.25:1 [D]. 16:1

Explanation:

No answer description available for this question.

 Billa said: (Mar 14, 2011) Please explain.

 Lavisha said: (Jun 13, 2011) Option c because N IS INVERSELY PROPOTIONAL TO THE RESISTSNCE.

 Sachi said: (Jun 23, 2011) Elaborate the theory in it please.

 Saritha said: (Aug 25, 2011) r2=160,r1=1000 k=(160/1000)^0.5 k=0.4

 Arudra Laxmi said: (Sep 10, 2011) Saritha I think your answer is wrong once you calculate again.

 R&Amp;J said: (Sep 28, 2011) Answer is c because IpRp=IsRs therefore Is*1000=Ip*160 and Ip/Is=k=N1/N2 k=1000/160=6.25:1

 Guest said: (Nov 23, 2011) Therefore Is*1000=Ip*160 and Ip/Is=k=N1/N2 k=1000/160=6.25:1

 Sukumar said: (Feb 24, 2012) I think right option is A because we know that direct formulae rp/rs=(Np/Ns)^2 rp=1000; rs=160; (Np/Ns)^2=(1000/160)--->6.25/1; then Np/Ns=2.5:1

 Jagadeesh said: (Feb 24, 2012) Z1/Z2=(N1/N2)^2 (1000/160)=(N1/N2) ^2 N1/N2=2.5:1 is the correct answer

 Naga Jyothi said: (Feb 28, 2012) sir.......... (N1/N2)^2=R1/R2 ABOVE ANSWER IS CORRECT SIR.... N1/N2=2.5:1

 Avinash said: (Apr 8, 2012) Correct answer is A as (Np/Ns) ^2=Zp/Zs.

 Raja said: (Aug 5, 2012) Answer is B because v1^2/r1=v2^2/r2 assuming 100% efficiency. So (v2/v1 = (r2/r1) ^0. 5 = k = 0.4:1.

 Ramjas said: (May 24, 2014) Answer is A because n1/n2 = square root(z1/z2). So Turn ratio is, n1 : n 2 = 2.5 : 1. Where n1 = No.of primary turns. n2 = No.of secondary turns. z1 = Primary impedance. z2 = Secondary impedance.

 Sarika Rajesh Banda said: (Aug 4, 2014) N = sqrt(Z1/Z2). Where, N = turns ratio Z1 = Primary impedance Z2 = Secondary impedance Answer is A.

 Ravisha said: (Nov 9, 2014) What is the relation of voltage and turns in transformer?

 Ranger said: (Jan 5, 2015) Vs/Vp = Ns/Np.

 Kamlesh Kunar said: (Mar 28, 2015) Np/Ns = (Zp/Zs)2.

 Guarav Yadav said: (Aug 22, 2015) As transformer also used in Impedance Matching, As we have relation square root (Zp/Zs) = Np/Ns. Given Zp = 1000 ohm and Zs = 160 ohm then. Np/Ns = Square root (1000/160) 2.5 : 1.

 Ajinkya said: (Sep 12, 2016) I think that here is the question about the secondary side of the transformer i.e. the secondary resistance of the coil means source resistance and when any resistance is connected across the source resistance is called load resistance. Please suggest me, if I'm wrong.

 Nidhi said: (Sep 16, 2016) Please tell the accurate answer. I am getting confused.

 Xyz said: (Oct 21, 2016) N2/N1 = V2/V1 = I1/I2 = K = SQR OF Rload/Rsource.

 Shreyas said: (Nov 9, 2016) k = sqrt(r2/r1). k = sqrt(160/1000), k = 0.4. Therefore ratio will be 0.4:1.

 Dinesh Rai said: (Jan 6, 2017) Is * 1000 = Ip * 160 and Ip/Is = k = N1/N2. k = 1000/160 = 6.25:1.

 Satya said: (Feb 1, 2017) N2/N1= √(r2/r1) = k.

 Shadan said: (Feb 5, 2018) According to me, the answer should be A.

 Shadan said: (Mar 4, 2018) N2/N1 = turn ratio. N1/N2 = Transformation ratio. N2/N1=under root R2/R1. SO 0.4:1.

 Shadan said: (Mar 4, 2018) Answer should be a Turn and transform ratio is same N1/N2. So answer A.

 Poonam said: (Sep 24, 2018) (N1/N2)^2 = R2/R1. So the answer is option B.