The rotor resistance and standstill reactance of a 3-phase induction motor are 0.015 Q and reactance 0.09 0 per phase. (i) What is the p.f. of the motor at start? (ii) What is the p.f. at a slip of 4 per cent? (iii) If the number of poles is 4, the supply frequency is 50-Hz and the standstill e.m.f. per rotor phase is 110 V, find out the full-load torque. Take the full-load slip as 4 per cent.
The rotor resistance and standstill reactance of a 3-phase induction motor are 0.015 Q and reactance 0.09 0 per phase. (i) What is the p.f. of the motor at start? (ii) What is the p.f. at a slip of 4 per cent? (iii) If the number of poles is 4, the supply frequency is 50-Hz and the standstill e.m.f. per rotor phase is 110 V, find out the full-load torque. Take the full-load slip as 4 per cent.
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter35: Harmonics 916
Section: Chapter Questions
Problem 3RQ: Would a positive-rotating harmonic or a negative-rotating harmonic be more harmful to an induction...
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![The rotor resistance and standstill reactance of a 3-phase induction motor
are 0.015 Q and reactance 0.09 0 per phase.
(i) What is the p.f. of the motor at start?
(ii) What is the p.f. at a slip of 4 per cent?
(iii) If the number of poles is 4, the supply frequency is 50-Hz and the
standstill e.m.f. per rotor phase is 110 V, find out the full-load torque.
Take the full-load slip as 4 per cent.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F618068a6-e80f-46ea-9a5a-1d3ee501c04c%2Ffb1e65de-6945-476b-afa0-77f8623472de%2Fvon047v_processed.jpeg&w=3840&q=75)
Transcribed Image Text:The rotor resistance and standstill reactance of a 3-phase induction motor
are 0.015 Q and reactance 0.09 0 per phase.
(i) What is the p.f. of the motor at start?
(ii) What is the p.f. at a slip of 4 per cent?
(iii) If the number of poles is 4, the supply frequency is 50-Hz and the
standstill e.m.f. per rotor phase is 110 V, find out the full-load torque.
Take the full-load slip as 4 per cent.
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