[amp_mcq option1=”the synchronous speed” option2=”less than synchronous speed” option3=”more than synchronous speed” option4=”none of the above” correct=”option1″]<\/p>\n
The correct answer is A. the synchronous speed.<\/p>\n
A synchronous motor is an AC electric motor that runs at a constant speed that is synchronized with the frequency of the AC power supply. The speed of a synchronous motor is determined by the frequency of the AC power supply and the number of poles on the stator. The synchronous speed is given by the following equation:<\/p>\n
$N_s = \\frac{120f}{P}$<\/p>\n
where $N_s$ is the synchronous speed in revolutions per minute (rpm), $f$ is the frequency of the AC power supply in hertz (Hz), and $P$ is the number of poles on the stator.<\/p>\n
For example, a synchronous motor with 4 poles and connected to a 60 Hz power supply will have a synchronous speed of 1200 rpm.<\/p>\n
The synchronous speed is the maximum speed at which a synchronous motor can run. If the motor is driven faster than the synchronous speed, the rotor will slip relative to the stator field. This slip causes the motor to develop a torque that opposes the driving force. As a result, the motor will not be able to run faster than the synchronous speed.<\/p>\n
Options B and C are incorrect because a synchronous motor cannot run at less than or more than the synchronous speed. Option D is incorrect because it does not provide a correct answer.<\/p>\n","protected":false},"excerpt":{"rendered":"
[amp_mcq option1=”the synchronous speed” option2=”less than synchronous speed” option3=”more than synchronous speed” option4=”none of the above” correct=”option1″]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[965],"tags":[],"class_list":["post-58943","post","type-post","status-publish","format-standard","hentry","category-synchronous-motors","no-featured-image-padding"],"yoast_head":"\n