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Transformers - Engineering

Q1:

The turns ratio required to match an 80  source to a 320  load is

A 80

B 20

C 4

D 2

ANS:D - 2

v1*i1 = v2 * i2.

V1^2/ R1 = V2^2/R2.

V2^2 / V1^2 = R2/R1.
(k)^2 = r2/r1.
k^2 = 320/80.
k^2 = 4 .
k = 2.