A 3-phase 440 V, 50 Hz induction motor has 4% slip. The frequency of rotor e.m.f. will be
A. 200 Hz
B. 50 Hz
C. 2 Hz
D. 0.2 Hz
Answer: Option C
Solution (By Examveda Team)
The slip in an induction motor is the difference between the synchronous speed and the actual rotor speed, expressed as a percentage of the synchronous speed. The frequency of the rotor emf is related to the slip and the supply frequency. For a 3-phase induction motor:Supply Frequency (fs): 50 Hz
Slip (s): 4% or 0.04
The frequency of the rotor emf (fr) can be calculated using the formula:
fr = s × fs
Substituting the values:
fr = 0.04 × 50 Hz = 2 Hz
Therefore, the frequency of the rotor emf is 2 Hz.
This Question Belongs to Electrical Engineering >> Polyphase Induction Motors
Join The Discussion
Comments (2)
Related Questions on Polyphase Induction Motors
Which is of the following data is required to draw the circle diagram for an induction motor?
A. Block rotor test only
B. No load test only
C. Block rotor test and no-load test
D. Block rotor test, no-load test and stator resistance test
The starting torque of a three phase induction motor can be increased by
A. Increasing slip
B. Increasing current
C. Both (A) and (B)
D. None of the above
Rotor rheostat control method of speed control is used for
A. Squirrel-cage induction motors only
B. Slip ring induction motors only
C. Both (A) and (B)
D. None of the above
Can u show the clear solution
F = sf