GATE Electrical Machines: Three-phase transformers: connections, vector groups, parallel operation – Previous Year Questions
7 GATE previous year questions on Three-phase transformers: connections, vector groups, parallel operation (Electrical Machines, Electrical Engineering) with answers and explanations, from every paper.
- GATE 2017 EE Q58 – A three-phase, three winding //Y (1.1 kV/6.6 kV/400 V) transformer is energized from AC mains at the 1.1 kV side. It supplies 900 kVA load at 0.8…
- GATE 2015 EE Q61 – Two single-phase transformers T 1 and T 2 each rated at 500 kVA are operated in parallel. Percentage impedances of T 1 and T 2 are (1 + j6) and (0.8 +…
- GATE 2016 EE Q52 – If the star side of the star-delta transformer shown in the figure is excited by a negative sequence voltage, then
- GATE 2018 EE Q61 – A 3-phase 900 kVA, 3 kV/3 kV (/Y), 50 Hz transformer has primary (high voltage side) resistance per phase of 0.3\ and secondary (low voltage side)…
- GATE 2020 EE Q58 – Windings 'A', 'B' and 'C' have 20 turns each and are wound on the same iron core as shown, along with winding 'X' which has 2 turns. The figure shows…
- GATE 2025 EE Q43 – The transformer connection given in the figure is part of a balanced 3-phase circuit where the phase sequence is “abc”. The primary to secondary turns…
- GATE 2026 EE Q38 – Three single-phase 11 kV/3.3 kV transformers are connected to form a three-phase transformer bank with connections as shown. Considering ABC phase…