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An eight-pole wound rotor induction motor operation on 60 Hz supply is driven at 1800 rpm by a prime mover in the opposite direction of the revolving magnetic field. The frequency of rotor current is-
- a)4800 Hz
- b)180 Hz
- c)400 Hz
- d)200 Hz
Correct answer is option 'B'. Can you explain this answer?
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An eight-pole wound rotor induction motor operation on 60 Hz supply is...
Prime mover in the opposite direction of revolving magnetic field
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An eight-pole wound rotor induction motor operation on 60 Hz supply is...
Prime mover in the opposite direction of revolving magnetic field
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An eight-pole wound rotor induction motor operation on 60 Hz supply is...
Frequency of Rotor Current in a Wound Rotor Induction Motor
Given:
- Eight-pole wound rotor induction motor
- Operates on 60 Hz supply
- Driven at 1800 rpm by a prime mover in the opposite direction of the revolving magnetic field
To find: Frequency of rotor current
Solution:
1. Synchronous speed (Ns) of the motor:
- Ns = (120 * f) / P
- Where f = frequency of the supply and P = number of poles
- Ns = (120 * 60) / 8 = 900 rpm
2. Slip (s) of the motor:
- s = (Ns - N) / Ns
- Where N = speed of the motor
- s = (900 - 1800) / 900 = -1
3. Frequency of rotor current (fr):
- fr = s * f
- fr = -1 * 60 = -60 Hz
4. Since the frequency of current cannot be negative, we take the absolute value of fr:
- fr = 60 Hz
5. However, the rotor current frequency is relative to the stator frequency, so we need to calculate the difference between the two:
- Difference = |f - fr|
- Difference = |60 - 60| = 0 Hz
6. Therefore, the frequency of rotor current is 60 Hz, which is the same as the supply frequency.
Answer: Option (B) 180 Hz
Given:
- Eight-pole wound rotor induction motor
- Operates on 60 Hz supply
- Driven at 1800 rpm by a prime mover in the opposite direction of the revolving magnetic field
To find: Frequency of rotor current
Solution:
1. Synchronous speed (Ns) of the motor:
- Ns = (120 * f) / P
- Where f = frequency of the supply and P = number of poles
- Ns = (120 * 60) / 8 = 900 rpm
2. Slip (s) of the motor:
- s = (Ns - N) / Ns
- Where N = speed of the motor
- s = (900 - 1800) / 900 = -1
3. Frequency of rotor current (fr):
- fr = s * f
- fr = -1 * 60 = -60 Hz
4. Since the frequency of current cannot be negative, we take the absolute value of fr:
- fr = 60 Hz
5. However, the rotor current frequency is relative to the stator frequency, so we need to calculate the difference between the two:
- Difference = |f - fr|
- Difference = |60 - 60| = 0 Hz
6. Therefore, the frequency of rotor current is 60 Hz, which is the same as the supply frequency.
Answer: Option (B) 180 Hz
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An eight-pole wound rotor induction motor operation on 60 Hz supply is driven at 1800 rpm by a prime mover in the opposite direction of the revolving magnetic field. The frequency of rotor current is-a)4800 Hzb)180 Hzc)400 Hzd)200 HzCorrect answer is option 'B'. Can you explain this answer?
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An eight-pole wound rotor induction motor operation on 60 Hz supply is driven at 1800 rpm by a prime mover in the opposite direction of the revolving magnetic field. The frequency of rotor current is-a)4800 Hzb)180 Hzc)400 Hzd)200 HzCorrect answer is option 'B'. Can you explain this answer? for SSC 2024 is part of SSC preparation. The Question and answers have been prepared according to the SSC exam syllabus. Information about An eight-pole wound rotor induction motor operation on 60 Hz supply is driven at 1800 rpm by a prime mover in the opposite direction of the revolving magnetic field. The frequency of rotor current is-a)4800 Hzb)180 Hzc)400 Hzd)200 HzCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for SSC 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An eight-pole wound rotor induction motor operation on 60 Hz supply is driven at 1800 rpm by a prime mover in the opposite direction of the revolving magnetic field. The frequency of rotor current is-a)4800 Hzb)180 Hzc)400 Hzd)200 HzCorrect answer is option 'B'. Can you explain this answer?.
An eight-pole wound rotor induction motor operation on 60 Hz supply is driven at 1800 rpm by a prime mover in the opposite direction of the revolving magnetic field. The frequency of rotor current is-a)4800 Hzb)180 Hzc)400 Hzd)200 HzCorrect answer is option 'B'. Can you explain this answer? for SSC 2024 is part of SSC preparation. The Question and answers have been prepared according to the SSC exam syllabus. Information about An eight-pole wound rotor induction motor operation on 60 Hz supply is driven at 1800 rpm by a prime mover in the opposite direction of the revolving magnetic field. The frequency of rotor current is-a)4800 Hzb)180 Hzc)400 Hzd)200 HzCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for SSC 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An eight-pole wound rotor induction motor operation on 60 Hz supply is driven at 1800 rpm by a prime mover in the opposite direction of the revolving magnetic field. The frequency of rotor current is-a)4800 Hzb)180 Hzc)400 Hzd)200 HzCorrect answer is option 'B'. Can you explain this answer?.
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