In a squirrel cage motor the induced e.m.f. is___________?
Correct answer: C. slip times the stand still e.m.f. induced in the rotor
- A. dependent on the shaft loading
- B. dependent on the number of slots
- C. slip times the stand still e.m.f. induced in the rotor
- D. none of the above
Explanation
Rotor frequency and induced rotor emf are proportional to slip; therefore, rotor emf at running condition is s times the standstill rotor emf. At standstill, s = 1, while near synchronous speed it becomes very small.
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