The speed of the synchronous motor used to sense time is proportional to its number of poles and the _______hertz line frequency.
A) 40
B) 50
C) 60
D) 70

Question

Quizplus · Accepted Answer

The speed of a synchronous motor is directly proportional to the number of poles and the line frequency. The line frequency in most countries is 60 hertz, so the speed of a synchronous motor is proportional to its number of poles and 60 hertz.

The Speed of the Synchronous Motor Used to Sense Time