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1. What would be the shunt field current of your motor if the shunt field winding is excited by 120 Vdc?

1. What would be the shunt field current of your motor if the shunt field winding is excited by 120 Vdc?

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
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1. What would be the shunt field current of your motor if the shunt field winding is excited by 120 Vdc? 2. If the rheostat were connected in series with the shunt field winding and the combination placed across a 120 Vdc line, what shunt field current variations could be obtained from your motor? Imin Adc Imax Adc 3. All of the windings and even the commutator of a dc machine are made of copper. why? 4. Why are the brushes of a dc machine made of carbon rather than copper? 5. The armature resistance plus brushes is substantially the same for every rotational position of the armature. Explain.
Transcribed Image Text:1. What would be the shunt field current of your motor if the shunt field winding is excited by 120 Vdc? 2. If the rheostat were connected in series with the shunt field winding and the combination placed across a 120 Vdc line, what shunt field current variations could be obtained from your motor? Imin Adc Imax Adc 3. All of the windings and even the commutator of a dc machine are made of copper. why? 4. Why are the brushes of a dc machine made of carbon rather than copper? 5. The armature resistance plus brushes is substantially the same for every rotational position of the armature. Explain.
1. State two ways by which the output polarity of a shunt DC generator can be changed. 2. If a DC generator delivers 180 w to a load, what is the minimum mechanical power (in watts) needed to drive the generator (assume 80% efficiency)? 3. Examine the saturation curve of the separately-excited dc shunt generator. Note that the curve "bends over" as the field current increases. Explain why this happens. 4. Use the data regulation from no-load to full-load (Ia = 1 Adc). from Table 2.2 and calculate the voltage No -load full-load Voltage Regulation x 100% VNo -load
Transcribed Image Text:1. State two ways by which the output polarity of a shunt DC generator can be changed. 2. If a DC generator delivers 180 w to a load, what is the minimum mechanical power (in watts) needed to drive the generator (assume 80% efficiency)? 3. Examine the saturation curve of the separately-excited dc shunt generator. Note that the curve "bends over" as the field current increases. Explain why this happens. 4. Use the data regulation from no-load to full-load (Ia = 1 Adc). from Table 2.2 and calculate the voltage No -load full-load Voltage Regulation x 100% VNo -load
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