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4. A 50 KVA, 4,400/220 transformer has R₁ = 3.45 2 and R₂ = 0.009 22. The values of reactances are X₁ = 5.2 2 and X₂ = 0.015 2. (a) (i) Determine the full-load primary current. (ii) Determine the full-load secondary current. (iii)Determine the turns ratio. (b) (i) Determine the equivalent resistance referred to the primary. (ii) Determine the equivalent reactance referred to the primary. (iii) Determine the equivalent impedance referred to the primary. (c) (i) Determine the equivalent resistance referred to the secondary. (ii) Determine the equivalent reactance referred to the secondary. (iii) Determine the equivalent impedance referred to the secondary. (d) Determine the magnitude of the equivalent impedance referred to the secondary using the magnitude of the equivalent impedance referred to the primary. (e) Determine the total copper losses using the individual resistances. (f) (i) Determine the total copper losses using the equivalent resistance as referred to the primary. (ii) Determine the total copper losses using the equivalent resistance as referred to the secondary. (iii)Comment on the answers to (e) and (f)(i)-(ii).