GATE EE 2014 Set 2 — Question 35
Go beyond PYQs with Success TrackerAI-powered personalised practice and doubt support. Unlimited practice on eligible plans; AI usage limits apply.MCQ+1 / -0.33MediumStarting & Speed ControlThree-Phase Induction MachinesElectrical Machines
Electrical Machines → Three-Phase Induction Machines → Starting & Speed Control
Last updated
Question
In a constant control of induction motor, the ratio is maintained constant from 0 to base frequency, where is the voltage applied to the motor at fundamental frequency . Which of the following statements relating to low frequency operation of the motor is TRUE?
Correct answer
(B) At low frequency, the stator flux decreases from its rated value.
Solution
In constant control, the air gap flux is ideally kept constant. However, the terminal voltage is the sum of the induced EMF and the stator resistance drop . At low frequencies, is small, and the drop becomes significant compared to . If the ratio is kept strictly constant, the induced EMF (which is ) decreases more than proportionally with frequency, leading to a reduction in the stator flux (). Therefore, at low frequency, the stator flux decreases from its rated value unless voltage boosting is applied.
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 Three-Phase Induction Machines
2026 Set 1 Q17A 15 kVA, 1100 V/220 V, single-phase two-winding transformer is configured as a 1.32 kV/1.1 kV…2026 Set 1 Q20A certain application requires power at a frequency of , while the available grid…2026 Set 1 Q21Which one of the following options is correct regarding the typical double-squirrel-cage structure…2026 Set 1 Q22The figure shows the single-line diagram of a synchronous generator delivering …2026 Set 1 Q31A 220V/12V single-phase transformer is designed for use in India and rated 100 VA at 50 Hz. Later,…