Question 250Electricity & Electronics - QMED
70% to passWhat is an advantage of DC motors over AC motors?
ADC motors offer a more effective means of controlling speed than AC motors
BDC motors are less expensive than AC motors
CDC motors require less maintenance than AC motors
DDC motors can be started across the line whereas AC motors cannot
AI Explanation
The correct answer is A) DC motors offer a more effective means of controlling speed than AC motors. This is correct because DC motors inherently allow for precise and continuous speed control, which is an advantage over AC motors. The speed of a DC motor can be easily adjusted by varying the voltage or current supplied to the motor, whereas the speed of an AC motor is primarily determined by the frequency of the AC power supply, which is more difficult to vary. The other options are incorrect because they do not accurately describe the key advantage of DC motors over AC motors in terms of speed control capabilities.
Related Questions
Q387:Of the following listed single-phase induction motors, which has the highest sta... Q88:In general, why are nickel-cadmium storage batteries superior to lead-acid batte... Q349:Before touching a small capacitor connected to a de-energized circuit, or even o... Q450:What is the reason that some electric cables are formed of stranded wire? ... Q510:The amount of voltage induced in the stator windings of a modern AC generator is...
Ready to test your knowledge?
Take a Electricity & Electronics - QMED Practice ExamOfficial Resources