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A self-excited (Shunt) DC generator rated at 10 kW, 120 V. and 1800 r/min. Its field circuit is rated at 5 A. The following data are known about the machine: R, 0.18 Ohms, Rw 24 Ohms, Rie 0 to 30 Ohms. The magnetization curve for a separately excited dc generator is shown in the following table at 1800 rpm. (A) 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 Voc (V) 2 15 40 60 80 95 108 115 121 125 130 133 136 140 142 The shunt field resistor Rydj is adjusted to 20 Q. and the generator's speed is 1800 r/min. 1. What is the no-load terminal voltage of the generator? 2. Assuming no armature reaction, what is the terminal voltage of the generator with an armature current of 20 A? 40 A? 60 A? 80 A? 3. Assuming an armature reaction equal to 0.5 A at full load, what is the terminal voltage of the generator with an armature current of 20 A? 40 A? 20 A? 40 A? 60 A? 80 A?

A self-excited (Shunt) DC generator rated at 10 kW, 120 V. and 1800 r/min. Its field circuit is rated at 5 A. The following data are known about the machine: R, 0.18 Ohms, Rw 24 Ohms, Rie 0 to 30 Ohms. The magnetization curve for a separately excited dc generator is shown in the following table at 1800 rpm. (A) 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 Voc (V) 2 15 40 60 80 95 108 115 121 125 130 133 136 140 142 The shunt field resistor Rydj is adjusted to 20 Q. and the generator's speed is 1800 r/min. 1. What is the no-load terminal voltage of the generator? 2. Assuming no armature reaction, what is the terminal voltage of the generator with an armature current of 20 A? 40 A? 60 A? 80 A? 3. Assuming an armature reaction equal to 0.5 A at full load, what is the terminal voltage of the generator with an armature current of 20 A? 40 A? 20 A? 40 A? 60 A? 80 A?

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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A self-excited (Shunt) DC generator rated at 10 kW, 120 V. and 1800 r/min. Its field circuit is rated at 5 A. The following data are known about the machine: R, = 0.18 Ohms, Riw = 24 Ohms, Ric = 0 to 30 Ohms. The magnetization curve for a separately excited dc generator is shown in the following table at 1800 rpm. 4(A) 0.5 1. 1.5 2 2.5 3.5 4.5 5.5 6 6.5 7 Voc (V) 2 15 40 60 80 95 108 115 121 125 130 133 136 140 142 The shunt field resistor Radj is adjusted to 20 Q. and the generator's speed is 1800 r/min. 1. What is the no-load terminal voltage of the generator? 2. Assuming no armature reaction, what is the terminal voltage of the generator with an armature current of 20 A? 40 A? 60 A? 80 A? 3. Assuming an armature reaction equal to 0.5 A at full load, what is the terminal voltage of the generator with an armature current of 20 A? 40 A? 20 A? 40 A? 60 A? 80 A? 4. Plot the terminal characteristics (VL versus I) of this generator with and without armature reaction.
Transcribed Image Text:A self-excited (Shunt) DC generator rated at 10 kW, 120 V. and 1800 r/min. Its field circuit is rated at 5 A. The following data are known about the machine: R, = 0.18 Ohms, Riw = 24 Ohms, Ric = 0 to 30 Ohms. The magnetization curve for a separately excited dc generator is shown in the following table at 1800 rpm. 4(A) 0.5 1. 1.5 2 2.5 3.5 4.5 5.5 6 6.5 7 Voc (V) 2 15 40 60 80 95 108 115 121 125 130 133 136 140 142 The shunt field resistor Radj is adjusted to 20 Q. and the generator's speed is 1800 r/min. 1. What is the no-load terminal voltage of the generator? 2. Assuming no armature reaction, what is the terminal voltage of the generator with an armature current of 20 A? 40 A? 60 A? 80 A? 3. Assuming an armature reaction equal to 0.5 A at full load, what is the terminal voltage of the generator with an armature current of 20 A? 40 A? 20 A? 40 A? 60 A? 80 A? 4. Plot the terminal characteristics (VL versus I) of this generator with and without armature reaction.
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