Which one of the following devices can be used to accurately and conveniently measure the speed of a motor with a small slip? A. Tachometer B. Revolution counter and stop watch C. Incandescent lamp and colored disk D. Stroboscope

Which one of the following devices can be used to accurately and conveniently measure the speed of a motor with a small slip? A. Tachometer B. Revolution counter and stop watch C. Incandescent lamp and colored disk D. Stroboscope

EBK ELECTRICAL WIRING RESIDENTIAL

19th Edition

ISBN:9781337516549

Author:Simmons

Publisher:Simmons

Chapter7: Luminaires, Ballasts, And Lamps

Section: Chapter Questions

Problem 15R: A good rule-of-thumb to estimate the expected life of a motor, a ballast, or other electrical...

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Concept explainers

Gear Motor

A gear motor is a combination of a gearbox and an electric motor. This combination of two systems is used for efficient usage of the motor. It makes a cost-effective solution for high torque, low-speed applications. These motors are used in our household as, garage door openers, alarm clocks. In commercial areas, hospital beds, cranes.

Question

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Which one of the following devices can be used to accurately and conveniently measure the speed of a
motor with a small slip?
A. Tachometer
B. Revolution counter and stop watch
C. Incandescent lamp and colored disk
D. Stroboscope

Note: I have doubts if it is the letter A or the letter D, can you help me in this question, thanks.

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