【Daily Question】Utilities - Mechanical & Electrical - 20200320
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Regarding the performance of motors, which statement is correct? () A. The most widely used type is the AC synchronous motor. B. DC motors have good starting performance. C. Synchronous motors are often used to drive machinery that requires precise speed control. D. Compared to DC motors, asynchronous motors have a lower power factor. 【Answer】B 【Explanation】This question tests the classification and performance of motors. Option A: The most widely used is the AC asynchronous motor ； Option C: Synchronous motors are commonly used to drive large and medium-sized low-speed machinery that operates at a constant speed ； Option D: Compared to DC motors, asynchronous motors have poorer starting performance and speed control capabilities ； Compared to synchronous motors, the power factor is not high
D. Asynchronous motors have a lower power factor compared to DC motors
This post was last edited by 1Hu Chunseng39 on 2020-3-20 at 12:01 b
D. Asynchronous motors have a lower power factor compared to DC motors