In transformers, which of the following statements is valid

Home » Electrical Machines » Electrical machines miscellaneous » Question

In transformers, which of the following statements is valid ?

1. In an open circuit test, copper losses are obtained while in short circuit test, core losses are obtained
2. In an open circuit test, current is drawn at high power factor
3. In a short circuit test, current is drawn at zero power factor
4. In an open circuit test, current is drawn at low power factor

Correct Option: D

In SC test, I₁ (FLC) is drawn at angle θ₁ In OC test, only I_o (NLC) is drawn at angle θ₂

θ₂ > θ₁
So cos θ₂ < cos θ₁
So current is drawn a low power factor.