Which of the speeds listed represents the synchronous speed rating of the lube oil pump motor shown in the illustration? GS-0011

Correct Answer: Option C — 1,200 RPM

Synchronous speed for an AC induction motor is calculated by the formula (120 x Frequency) / Number of Poles. A standard 60Hz motor with 6 poles operates at a synchronous speed of 1,200 RPM. This rating is critical for matching pump performance curves to the required system head and flow.