A 240 V series motor takes 40 amperes when giving its rated output at 1500r.p.m. Its resistance is 0.3 ohm. Find what resistance must be added to obtain rated torque at 1000 r.p.m. * O 2 O 1.9 O 2.1

Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter32: Three-phase Motors
Section: Chapter Questions
Problem 13RQ: A squirrel-cage induction motor is operating at 1175 RPM and producing a torque of 22 Ib-ft. What is...
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A 240 V series motor takes 40
amperes when giving its rated output
at 1500r.p.m. Its resistance is 0.3
ohm. Find what resistance must be
added to obtain rated torque at
starting. *
5.7
6.7
5.5
6.3
A 240 V series motor takes 40
amperes when giving its rated output
at 1500r.p.m. Its resistance is 0.3
ohm. Find what resistance must be
added to obtain rated torque at 1000
r.p.m. *
O 2
1.9
2.1
1.8
Transcribed Image Text:A 240 V series motor takes 40 amperes when giving its rated output at 1500r.p.m. Its resistance is 0.3 ohm. Find what resistance must be added to obtain rated torque at starting. * 5.7 6.7 5.5 6.3 A 240 V series motor takes 40 amperes when giving its rated output at 1500r.p.m. Its resistance is 0.3 ohm. Find what resistance must be added to obtain rated torque at 1000 r.p.m. * O 2 1.9 2.1 1.8
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