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A 3-phase, 50 Hz induction motor has a full load speed of 1440 rpm. The number of poles of the motor is
- a)4
- b)5
- c)6
- d)None of these
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
A 3-phase, 50 Hz induction motor has a full load speed of 1440 rpm. Th...
Since the number of poles must be even and a whole number, therefore the number of poles must be 4.
Most Upvoted Answer
A 3-phase, 50 Hz induction motor has a full load speed of 1440 rpm. Th...
Explanation:
- The synchronous speed of an induction motor is given by,
Ns = 120f/p
where,
Ns = synchronous speed in rpm
f = supply frequency in Hz
p = number of poles
- At full load, the actual speed of the motor is slightly less than the synchronous speed, due to slip.
- The slip of an induction motor is given by,
s = (Ns - N)/Ns
where,
N = actual speed in rpm
- For a 3-phase, 50 Hz induction motor with a full load speed of 1440 rpm,
Ns = 120*50/4 = 1500 rpm
- Therefore, the slip is,
s = (1500 - 1440)/1500 = 0.04 or 4%
- Now, the number of poles can be calculated as,
p = 120*50/Ns = 120*50/1440 = 4
- Hence, the number of poles of the motor is 4.
Therefore, option A is the correct answer.
- The synchronous speed of an induction motor is given by,
Ns = 120f/p
where,
Ns = synchronous speed in rpm
f = supply frequency in Hz
p = number of poles
- At full load, the actual speed of the motor is slightly less than the synchronous speed, due to slip.
- The slip of an induction motor is given by,
s = (Ns - N)/Ns
where,
N = actual speed in rpm
- For a 3-phase, 50 Hz induction motor with a full load speed of 1440 rpm,
Ns = 120*50/4 = 1500 rpm
- Therefore, the slip is,
s = (1500 - 1440)/1500 = 0.04 or 4%
- Now, the number of poles can be calculated as,
p = 120*50/Ns = 120*50/1440 = 4
- Hence, the number of poles of the motor is 4.
Therefore, option A is the correct answer.
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A 3-phase, 50 Hz induction motor has a full load speed of 1440 rpm. The number of poles of the motor isa)4b)5c)6d)None of theseCorrect answer is option 'A'. Can you explain this answer? for Electrical Engineering (EE) 2025 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 3-phase, 50 Hz induction motor has a full load speed of 1440 rpm. The number of poles of the motor isa)4b)5c)6d)None of theseCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A 3-phase, 50 Hz induction motor has a full load speed of 1440 rpm. The number of poles of the motor isa)4b)5c)6d)None of theseCorrect answer is option 'A'. Can you explain this answer?.
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