A 240 V dc series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 ohms. The value of resistance which must be added to obtain rated torque at 1000 rpm is: O O 6 ohms 5.7 ohms 2.2 ohms 1.9 ohms

A 240 V dc series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 ohms. The value of resistance which must be added to obtain rated torque at 1000 rpm is: O O 6 ohms 5.7 ohms 2.2 ohms 1.9 ohms

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter8: Basic Electric Motors

Section: Chapter Questions

Problem 11RQ

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Concept explainers

Three Phase Induction Motor

The induction motor is an electric motor that runs on AC (alternating current) and it is of two type single phase motor that work on single-phase power supply and three-phase motor that work on three-phase power supply.

Question

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A 240 V dc series motor takes 40 A when giving its
rated output at 1500 rpm. Its resistance is 0.3 ohms.
The value of resistance which must be added to
obtain rated torque at 1000 rpm ¡s:
O
O
6 ohms
5.7 ohms
2.2 ohms
1.9 ohms

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