A 4 kVA, 400 V/200 V single phase transformer has resistance of 0.02 p.u and reactance of 0.06 p.u. The resistance and reactance referred to HV side are
- A. 0.2 Ω and 0.6 Ω
- B. 0.8 Ω and 2.4 Ω
- C. 0.08 Ω and 0.24 Ω
- D. 2 Ω and 6 Ω
Answer: B. 0.8 Ω and 2.4 Ω
Explanation: Base impedance on HV side Zb,HV = (400 V)² / 4000 VA = 40 Ω. R_HV = 0.02 × 40 = 0.8 Ω; X_HV = 0.06 × 40 = 2.4 Ω.