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If the full load speed of a 3 phase 50 Hz 6 pole induction motor is 950 rpm. What is its half load speed nearly equal to
  • a)
    1000 rpm
  • b)
    450 rpm
  • c)
    1900 rpm
  • d)
    975 rpm
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
If the full load speed of a 3 phase 50 Hz 6 pole induction motor is 95...
The synchronous speed of induction motor,

At full load, slip 
We know that slip is directly proportional to load, hence at half load slip will be 0.025
At half load rotor speed, Nr  = Ns (1 - s) = 1000 (1 - 0.025) = 975 rpm
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Most Upvoted Answer
If the full load speed of a 3 phase 50 Hz 6 pole induction motor is 95...
The synchronous speed of induction motor,

At full load, slip 
We know that slip is directly proportional to load, hence at half load slip will be 0.025
At half load rotor speed, Nr  = Ns (1 - s) = 1000 (1 - 0.025) = 975 rpm
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