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The rotor of a 3-phase induction motor has 0.04 Ω resistance per phase and 0.2 Ω standstill reactance per phase. An external resistance is used in the rotor circuit in order to get half of the maximum torque at starting. Neglect stator impedance. By what percentage will this external resistance change the power factor at starting?
    Correct answer is between '30,35'. Can you explain this answer?
    Most Upvoted Answer
    The rotor of a 3-phase induction motor has 0.04 Ω resistance per...

    ⇒ s2mt - 4smt + 1 = 0
    ⇒ smt = 3.73 (or) 0.27
    smt = 3.72 is not valid.
    So, smt = 0.27

    ⇒ r'2 = 0.2 x 0.27 = 0.054Ω
    External resistance that must be inserted in the rotor circuit
    = r'- r2 = 0.054 - 0.04 = 0.014Ω
    Without external resistance,
    Power factor = 
    With external resistance,
    Power factor 
    Percentage improvement in power factor
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    The rotor of a 3-phase induction motor has 0.04 Ω resistance per...
    The rotor of a 3-phase induction motor has 0.04 per unit resistance.
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    The rotor of a 3-phase induction motor has 0.04 Ω resistance per phase and 0.2 Ω standstill reactance per phase. An external resistance is used in the rotor circuit in order to get half of the maximum torque at starting. Neglect stator impedance. By what percentage will this external resistance change the power factor at starting?Correct answer is between '30,35'. Can you explain this answer?
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    The rotor of a 3-phase induction motor has 0.04 Ω resistance per phase and 0.2 Ω standstill reactance per phase. An external resistance is used in the rotor circuit in order to get half of the maximum torque at starting. Neglect stator impedance. By what percentage will this external resistance change the power factor at starting?Correct answer is between '30,35'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about The rotor of a 3-phase induction motor has 0.04 Ω resistance per phase and 0.2 Ω standstill reactance per phase. An external resistance is used in the rotor circuit in order to get half of the maximum torque at starting. Neglect stator impedance. By what percentage will this external resistance change the power factor at starting?Correct answer is between '30,35'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The rotor of a 3-phase induction motor has 0.04 Ω resistance per phase and 0.2 Ω standstill reactance per phase. An external resistance is used in the rotor circuit in order to get half of the maximum torque at starting. Neglect stator impedance. By what percentage will this external resistance change the power factor at starting?Correct answer is between '30,35'. Can you explain this answer?.
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