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A properly shunted centre-zero galvanometer is connected in the rotor circuit of a 6-pole, 50 Hz would-rotor induction motor. If the galvanometer makes 90 complete oscillations in one minute, the speed of rotor would be
  • a)
    1000 rpm
  • b)
    740 rpm
  • c)
    880 rpm
  • d)
    970 rpm
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
A properly shunted centre-zero galvanometer is connected in the rotor ...
Given Data:
- Number of poles (P) = 6
- Frequency (f) = 50 Hz
- Number of oscillations in one minute = 90

Calculations:
1. Calculate synchronous speed (Ns) using the formula:
Ns = (120 * f) / P
Ns = (120 * 50) / 6
Ns = 1000 rpm
2. Calculate actual speed of rotor using the formula:
Actual speed = (Number of oscillations * Ns) / 60
Actual speed = (90 * 1000) / 60
Actual speed = 1500 rpm
3. Since the galvanometer makes 90 complete oscillations in one minute, it indicates the speed of the rotor would be half the actual speed:
Rotor speed = 1500 / 2
Rotor speed = 750 rpm

Conclusion:
Therefore, the speed of the rotor would be 750 rpm, which is closest to option 'D' (970 rpm).
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Community Answer
A properly shunted centre-zero galvanometer is connected in the rotor ...
Rotor frequency,
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A properly shunted centre-zero galvanometer is connected in the rotor circuit of a 6-pole, 50 Hz would-rotor induction motor. If the galvanometer makes 90 complete oscillations in one minute, the speed of rotor would bea)1000 rpmb)740 rpmc)880 rpmd)970 rpmCorrect answer is option 'D'. Can you explain this answer?
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A properly shunted centre-zero galvanometer is connected in the rotor circuit of a 6-pole, 50 Hz would-rotor induction motor. If the galvanometer makes 90 complete oscillations in one minute, the speed of rotor would bea)1000 rpmb)740 rpmc)880 rpmd)970 rpmCorrect answer is option 'D'. 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 properly shunted centre-zero galvanometer is connected in the rotor circuit of a 6-pole, 50 Hz would-rotor induction motor. If the galvanometer makes 90 complete oscillations in one minute, the speed of rotor would bea)1000 rpmb)740 rpmc)880 rpmd)970 rpmCorrect answer is option 'D'. 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 properly shunted centre-zero galvanometer is connected in the rotor circuit of a 6-pole, 50 Hz would-rotor induction motor. If the galvanometer makes 90 complete oscillations in one minute, the speed of rotor would bea)1000 rpmb)740 rpmc)880 rpmd)970 rpmCorrect answer is option 'D'. Can you explain this answer?.
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