Question 532Electricity & Electronics - Assistant Engineer

The correct answer is B) 900 rpm. The synchronous speed of an induction motor is determined by the number of poles and the frequency of the power supply. The formula for calculating synchronous speed is: Synchronous speed (rpm) = (120 x Frequency) / Number of Poles In this case, the motor has 8 poles and is operating on a 60 Hz power supply. Plugging these values into the formula: Synchronous speed = (120 x 60) / 8 = 900 rpm The other options are incorrect because: A) 875 rpm is not the correct synchronous speed for an 8-pole, 60 Hz motor. C) 1725 rpm is the synchronous speed for a 4-pole, 60 Hz motor. D) 1800 rpm is the synchronous speed for a 2-pole, 60 Hz motor.