Open Circuit Test — Study Resources & PYQs

Open circuit test used for determining transformer parameters.

Study resources

Testbook - OC Test and SC Test of Transformer (Article) — Explains the open-circuit test procedure, circuit diagram, and how to compute equivalent circuit parameters from the results.
Basic Electrical Engineering - OC Test and SC Test on Transformer (Video) — Indian faculty lecture demonstrating the open-circuit test on a single-phase transformer with calculations.
Circuit Globe - Open Circuit and Short Circuit Test on Transformer (Article) — Indian site. Circuit diagrams, which side is energised, phasor diagram, and the calculation of R0, X0, R01, X01.
TutorialsPoint - Open and Short Circuit Test of Transformer (Article) — Indian site. Compact version with the numerical steps laid out cleanly. Good for quick revision the night before.
How Electrical - OC and SC Test: Set-up and Procedure (Article) — Lab-oriented explanation with the variac, wattmeter and ammeter connections. Useful for the practical/lab viva as well.
NPTEL — Fundamentals of Electrical Engineering, IIT Kharagpur (Article) — Current IIT Kharagpur NPTEL course covering DC/AC circuits, three-phase circuits, resonance, transformers and electrical machines.
NPTEL — A Basic Course on Electric and Magnetic Circuits (Article) — Current IIT Kharagpur NPTEL course covering electric/magnetic circuits, phasors, three-phase systems and transformer-equivalent circuits.

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