Three Phase Induction Motors MCQs with Explanatory Answers
1. If the frequency of 3-phase supply to the stator of 3-phase induction motor is increased, then synchronous speed is ________?
- Increased
- Decreased
- Remain unchanged
- None of the above
Show Explanatory Answer
Answer: 1. Increased
Explanation: As we know that; f = NSP/ 120
It is clear that f ∝ NS i.e., frequency (f) is directly proportional to the Synchronous speed (NS).
In more clear words, when frequency increases, Speed also increases.
Explanation: As we know that; f = NSP/ 120
It is clear that f ∝ NS i.e., frequency (f) is directly proportional to the Synchronous speed (NS).
In more clear words, when frequency increases, Speed also increases.
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