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A wound rotor induction motor runs with a slip of 0.05 when developing full load torque. Its rotor resistance is 0.45 Ω per phase. If an external resistance of 0.50 Ω per phase is connected across the slip rings, what is the slip for full torque?
  • a)
    0.03
  • b)
    0.06
  • c)
    0.09
  • d)
    0.1
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
A wound rotor induction motor runs with a slip of 0.05 when developing...
Concept:
Rotor resistance method of speed control:
Under load condition torque approximately
T ∝ (sV
1
2
) / (R
2
+ R
e
)
  • In this method, some external resistance is inserted under the load conditions.
  • Then the slip of the induction motor increases to maintain the load torque constant.
  • As slip is increased, the speed of the motor will be reduced to below the rated speed.
  • In this method, the motor acts as a constant torque variable power drive.
For torque constant(T = k)
Calculation:
For induction motor, the torque in rotor resistance control methods is given as
For full load torque
= 0.1055
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A wound rotor induction motor runs with a slip of 0.05 when developing full load torque. Its rotor resistance is 0.45 Ω per phase. If an external resistance of 0.50 Ω per phase is connected across the slip rings, what is the slip for full torque?a)0.03b)0.06c)0.09d)0.1Correct answer is option 'D'. Can you explain this answer?
Question Description
A wound rotor induction motor runs with a slip of 0.05 when developing full load torque. Its rotor resistance is 0.45 Ω per phase. If an external resistance of 0.50 Ω per phase is connected across the slip rings, what is the slip for full torque?a)0.03b)0.06c)0.09d)0.1Correct answer is option 'D'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about A wound rotor induction motor runs with a slip of 0.05 when developing full load torque. Its rotor resistance is 0.45 Ω per phase. If an external resistance of 0.50 Ω per phase is connected across the slip rings, what is the slip for full torque?a)0.03b)0.06c)0.09d)0.1Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A wound rotor induction motor runs with a slip of 0.05 when developing full load torque. Its rotor resistance is 0.45 Ω per phase. If an external resistance of 0.50 Ω per phase is connected across the slip rings, what is the slip for full torque?a)0.03b)0.06c)0.09d)0.1Correct answer is option 'D'. Can you explain this answer?.
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