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1. The armature of a shunt generator has 0.08- effective resistance. Each brush has an effect resistance of 0.02 ohm. The terminal voltage while the current is 60 A What is its efficiency

1. The armature of a shunt generator has 0.08- effective resistance. Each brush has an effect resistance of 0.02 ohm. The terminal voltage while the current is 60 A What is its efficiency

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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Please help me with my last three assignments. This is my last ask an expert, please. 

1. The armature of a shunt generator has 0.08-ohm effective resistance. Each brush has an effective resistance of 0.02 ohm. The terminal voltage is 120 V while the current is 60 A. What is its efficiency? 2. A 20 kW, 230 V, shunt generator was run light as motor to determine its stray power losses at rated load. The applied voltage across the armature, computed for test was 260 V and the armature current drawn is 3 A. The armature and shunt field resistance are 0.30 and 100 ohms, respectively. Calculate the generator efficiency at half-load. Assume stray power losses to be constant. 3. A shunt generator supplies 120 A at 220 V. The armature and shunt resistances are 0.030 ohms and 100 ohms, respectively. If the copper losses are equal to the iron losses at this load, find the brake horsepower of the engine driving the generator.
Transcribed Image Text:1. The armature of a shunt generator has 0.08-ohm effective resistance. Each brush has an effective resistance of 0.02 ohm. The terminal voltage is 120 V while the current is 60 A. What is its efficiency? 2. A 20 kW, 230 V, shunt generator was run light as motor to determine its stray power losses at rated load. The applied voltage across the armature, computed for test was 260 V and the armature current drawn is 3 A. The armature and shunt field resistance are 0.30 and 100 ohms, respectively. Calculate the generator efficiency at half-load. Assume stray power losses to be constant. 3. A shunt generator supplies 120 A at 220 V. The armature and shunt resistances are 0.030 ohms and 100 ohms, respectively. If the copper losses are equal to the iron losses at this load, find the brake horsepower of the engine driving the generator.
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