Question 533Electricity & Electronics - Assistant Engineer

70% to pass

What would be the actual rotor speed for a 4-pole three-phase squirrel-cage induction motor operating at 60 Hz if the rotor slip is 3%?

A1746 rpm
B1793 rpm
C1800 rpm
D1854 rpm
AI Explanation

The correct answer is A) 1746 rpm. To calculate the actual rotor speed, we need to use the formula: Actual Rotor Speed = Synchronous Speed x (1 - Slip) Where: - Synchronous Speed = (120 x Frequency) / Number of Poles - Slip = 3% or 0.03 Plugging in the values: - Synchronous Speed = (120 x 60) / 4 = 1800 rpm - Actual Rotor Speed = 1800 x (1 - 0.03) = 1746 rpm The other options are incorrect because: B) 1793 rpm is too high C) 1800 rpm is the synchronous speed, not the actual rotor speed D) 1854 rpm is too high

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Official Resources
46 CFR Electrical Engineering 46 CFR Machinery & Electrical USCG National Maritime Center
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