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A 3-phase 440 V, 50 Hz induction motor has 4% slip. The frequency of rotor e.m.f. will be
Answer & Solution
Correct Answer:
Option
C
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.
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.
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