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A 420 V, 6 pole, 50 Hz star connected induction rotor has stator impedance of 0.07 + j 0.3 ohms and stand still impedance referred to stator is 0.08 + j 0.37 ohms. If the magnetizing current is neglected, the slip at maximum internal torque developed is
  • a)
    0.125
  • b)
    0.233
  • c)
    0.1187
  • d)
    0.286
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
A 420 V, 6 pole, 50 Hz star connected induction rotor has stator impe...
For maximum slip,
s = 0.1187
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Community Answer
A 420 V, 6 pole, 50 Hz star connected induction rotor has stator impe...
Given data:
- Voltage (V) = 420 V
- Number of poles (p) = 6
- Frequency (f) = 50 Hz
- Stator impedance (Zs) = 0.07 + j0.3 ohms
- Stand still impedance referred to stator (Zr) = 0.08 + j0.37 ohms

Formula:
- Slip (s) = (Zr - Zs) / Zs

Calculation:
- Substituting the given values in the formula:
- Zr - Zs = 0.08 + j0.37 - 0.07 - j0.3 = 0.01 + j0.07 ohms
- Zr / Zs = (0.01 + j0.07) / (0.07 + j0.3)
= (0.01 * 0.07 + 0.07 * 0.3) / (0.07^2 + 0.3^2)
= (0.0007 + 0.021) / (0.0049 + 0.09)
= 0.0217 / 0.0949
≈ 0.2287
- Therefore, the slip at maximum internal torque developed is approximately 0.1187 or 11.87%.
The correct answer is option 'C'.
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A 420 V, 6 pole, 50 Hz star connected induction rotor has stator impedance of 0.07 + j 0.3 ohms and stand still impedance referred to stator is 0.08 + j 0.37 ohms. If the magnetizing current is neglected, the slip at maximum internal torque developed isa)0.125b)0.233c)0.1187d)0.286Correct answer is option 'C'. Can you explain this answer?
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A 420 V, 6 pole, 50 Hz star connected induction rotor has stator impedance of 0.07 + j 0.3 ohms and stand still impedance referred to stator is 0.08 + j 0.37 ohms. If the magnetizing current is neglected, the slip at maximum internal torque developed isa)0.125b)0.233c)0.1187d)0.286Correct answer is option 'C'. 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 A 420 V, 6 pole, 50 Hz star connected induction rotor has stator impedance of 0.07 + j 0.3 ohms and stand still impedance referred to stator is 0.08 + j 0.37 ohms. If the magnetizing current is neglected, the slip at maximum internal torque developed isa)0.125b)0.233c)0.1187d)0.286Correct answer is option 'C'. 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 A 420 V, 6 pole, 50 Hz star connected induction rotor has stator impedance of 0.07 + j 0.3 ohms and stand still impedance referred to stator is 0.08 + j 0.37 ohms. If the magnetizing current is neglected, the slip at maximum internal torque developed isa)0.125b)0.233c)0.1187d)0.286Correct answer is option 'C'. Can you explain this answer?.
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