Question

A transformer operating at primary voltage 8 kV and secondary voltage 160 V serves a load of 80 kW. Assuming the transformer to be ideal with purely resistive load and working on unity power factor, the loads in the primary and secondary circuit would be

• A. 800 Ω and 1.06 Ω
• B. 10 Ω and 500 Ω
• C. 800 Ω and 0.32 Ω
• D. 1.06 Ω and 500 Ω

Answer 1

Answer: (C)

800 Ω and 0.32 Ω

Answer 2

$\frac{(8 × 10^3)^2}{R_P} = 80 × 10^3$

$R_P = 800 Ω$

$\frac{(160)^2}{R_s} = 80×10^3$

$R_s = 0.32 Ω$