20. What is the effect of applying a lower-than-rated voltage to a fractional-horsepower motor? A. The motor will operate with increased magnetizing current. B. The motor will operate satisfactorily at 95% of the rated voltage. C. The motor will heat up dangerously.

20. What is the effect of applying a lower-than-rated voltage to a fractional-horsepower motor? A. The motor will operate with increased magnetizing current. B. The motor will operate satisfactorily at 95% of the rated voltage. C. The motor will heat up dangerously.

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter43: About Dc Motors

Section: Chapter Questions

Problem 1SQ

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Concept explainers

DC Series Motors

A DC motor is a type of electric motor which converts electric energy into mechanical energy. The forces that are produced by the magnetic field are what those common types of motors rely upon. Either electro-mechanical or electronic, all types of DC motors have some internal mechanism to change the current direction in part of the DC motors. As the DC motors could be powered from existing DC lighting power distribution systems, these motors were the first form of motors widely used. By changing the strength of the current in its field winding or by using a variable supply voltage, the speed of the DC motors can be controlled over a wide range.

Question

20. What is the effect of applying a lower-than-rated voltage to a fractional-horsepower motor?
A. The motor will operate with increased magnetizing current.
B. The motor will operate satisfactorily at 95% of the rated voltage.
C. The motor will heat up dangerously.

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