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A 10-hp, 120-V, 1000 rpm shunt DC motor has a full load armature current of 70 A when operating at rated conditions. The armature resistance of the motor, RA is 0.12 Q and the field resistance Rp is 40 Q. The adjustable resistance of the motor in the field circuit, Radi may be varied over the range from 0 to 200 Q and currently set at 100 Q. Armature reaction can be ignored in this machine. The magnetization curve for this motor, taken at a speed of 1000 rpm is summarized in the following table. Note that linear interpolation applies when the value is not explicitly stated in the table. EA, V 78 95 112 118 126 IF, A 0.00 0.80 1.00 1.28 1.44 2.88 If the motor is now unloaded with no changes in terminal voltage or Radj, how much is the increase in the no load speed of the motor? Hint: For linear interpolation in the interval, the formula to obtain the unknown point in this interval is as follows: Yo(x1-x) + y1(x – x) y = X1 - xo

A 10-hp, 120-V, 1000 rpm shunt DC motor has a full load armature current of 70 A when operating at rated conditions. The armature resistance of the motor, RA is 0.12 Q and the field resistance Rp is 40 Q. The adjustable resistance of the motor in the field circuit, Radi may be varied over the range from 0 to 200 Q and currently set at 100 Q. Armature reaction can be ignored in this machine. The magnetization curve for this motor, taken at a speed of 1000 rpm is summarized in the following table. Note that linear interpolation applies when the value is not explicitly stated in the table. EA, V 78 95 112 118 126 IF, A 0.00 0.80 1.00 1.28 1.44 2.88 If the motor is now unloaded with no changes in terminal voltage or Radj, how much is the increase in the no load speed of the motor? Hint: For linear interpolation in the interval, the formula to obtain the unknown point in this interval is as follows: Yo(x1-x) + y1(x – x) y = X1 - xo

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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A 10-hp, 120-V, 1000 rpm shunt DC motor has a full load armature current of 70 A when operating at rated conditions. The armature resistance of the motor, RA is 0.12 0 and the field resistance Rp is 40 Q. The adjustable resistance of the motor in the field circuit, Radj may be varied over the range from 0 to 200 Q and currently set at 100 Q. Armature reaction can be ignored in this machine. The magnetization curve for this motor, taken at a speed of 1000 rpm is summarized in the following table. Note that linear interpolation applies when the value is not explicitly stated in the table. EA, V 78 95 112 118 126 IF, A 0.00 0.80 1.00 1.28 1.44 2.88 If the motor is now unloaded with no changes in terminal voltage or Radj, how much is the increase in the no load speed of the motor? Hint: For linear interpolation in the interval, the formula to obtain the unknown point in this interval is as follows: Yo(x1-x) + y1(x - x) y = X1 - Xo
Transcribed Image Text:A 10-hp, 120-V, 1000 rpm shunt DC motor has a full load armature current of 70 A when operating at rated conditions. The armature resistance of the motor, RA is 0.12 0 and the field resistance Rp is 40 Q. The adjustable resistance of the motor in the field circuit, Radj may be varied over the range from 0 to 200 Q and currently set at 100 Q. Armature reaction can be ignored in this machine. The magnetization curve for this motor, taken at a speed of 1000 rpm is summarized in the following table. Note that linear interpolation applies when the value is not explicitly stated in the table. EA, V 78 95 112 118 126 IF, A 0.00 0.80 1.00 1.28 1.44 2.88 If the motor is now unloaded with no changes in terminal voltage or Radj, how much is the increase in the no load speed of the motor? Hint: For linear interpolation in the interval, the formula to obtain the unknown point in this interval is as follows: Yo(x1-x) + y1(x - x) y = X1 - Xo
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