A four-pole induction motor, operating on...

A four-pole induction motor, operating on...

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Question 1 of 205eccefa4bacbc34ba4d481e9

A four-pole induction motor, operating on three-phase 60 cycle current will operate at approximately __________.

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A four-pole induction motor, operating on three-phase 60 cycle current will operate at approximately __________.

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🔍 Key Concepts

• Synchronous speed formula for induction motors on 60 Hz power • Relationship between number of poles and motor speed • Difference between synchronous speed and actual induction motor speed (slip)

💭 Think About

• First, calculate the synchronous speed of a 4‑pole motor on 60 Hz power before considering any slip. • Compare that theoretical speed with each of the choices and think about which one is slightly lower than synchronous speed. • Eliminate any RPM values that are clearly associated with a very different number of poles (e.g., 2‑pole vs 6‑pole).

✅ Before You Answer

• Use the standard formula: Ns = (120 × Frequency) / Number of poles (Ns in RPM). • Confirm that a real induction motor runs a bit slower than synchronous speed due to slip. • Check which option is closest to but less than the calculated synchronous speed for a 4‑pole, 60 Hz motor.

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