GATE EE 2026 Set 1 — Question 19
Go beyond PYQs with Success TrackerAI-powered personalised practice and doubt support. Unlimited practice on eligible plans; AI usage limits apply.MCQ+1 / -0.33MediumSymmetrical ComponentsFault AnalysisPower Systems
Power Systems → Fault Analysis → Symmetrical Components
Last updated
Question
The initial three-phase voltage phasors (, , and ) at a bus of a power network are as shown in Case-1. Due to a disturbance, the bus voltage phasors changed in phase by a small angle , and the magnitudes remained the same as depicted in Case-2. 
Which one of the following statements is correct about the zero sequence
components?
components?
Correct answer
(D) The zero sequence components in Case-1 and Case-2 have the same magnitude but different phase angles
Solution
The zero sequence component is defined as . In Case-2, each phasor is rotated by a small angle , which can be represented mathematically as multiplying each phasor by . Thus, the new phasors are , , and . The new zero sequence component is:This shows that the magnitude remains the same, but the phase angle of the zero sequence component changes by . Therefore, the zero sequence components in Case-1 and Case-2 have the same magnitude but different phase angles.
Continue learning with Success Tracker
A step still unclear? Work through it with support
Use Success Tracker to ask about the reasoning, then try another GATE EE question to check your understanding.
AI-powered practice· Unlimited practice on eligible plans
- PYQs with solutions
- Attempt available previous-year questions, then compare your reasoning with the worked solution. Coverage varies by stream.
- Practice that adapts
- Choose a topic, work on weaker areas and bookmark questions to revisit. Your attempts feed your progress tracking.
- AI doubt support
- Ask follow-up questions about a step or concept while practising, instead of stopping at the final answer.
Unlimited practice is available on eligible plans. Free practice and AI usage have limits; check the current plan allowances before choosing.
This page stays readable without an account. AI responses can be wrong; check them against the solution and source material.
More questions on Fault Analysis
2026 Set 1 Q18Consider a power system with buses, of which are generator buses and the remaining are…2026 Set 1 Q39In the circuit shown, the phase currents are A…2026 Set 1 Q40The operating characteristic of a reactance relay is given by , where is the…2026 Set 1 Q41A three-phase two-winding transformer has a voltage transformation ratio…2026 Set 1 Q54For the balanced 3-phase transmission line shown, consider the following cases: [figure]…