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A separately excited dc generator is rated at 172 kW, 430 V, 400 A, and 1800 r/min. Ra = 0.05 N, Rf = 20 N, Radj = 0 to 300 N, VF = 430 V, Nf = 1000 turns per pole a) If the variable resistor Radj in this generator's field circuit is adjusted to 63 N and the generator's prime mover is driving it at 1600 r/min, what is this generator's no-load terminal voltage? b) What would its voltage be if a 360-A load were connected to its terminals? Assume that the generator has compensating windings c) What would its voltage be if a 360-A load were connected to its terminals but the generator does not have compensating windings? Assume that its armature reaction at this load is 450 A • turns. d) What adjustment could be made to the generator to restore its terminal voltage to the value found in part a? e) How much field current would be needed to restore the terminal voltage to its no-load value? (Assume that the machine has compensating windings.) What is

A separately excited dc generator is rated at 172 kW, 430 V, 400 A, and 1800 r/min. Ra = 0.05 N, Rf = 20 N, Radj = 0 to 300 N, VF = 430 V, Nf = 1000 turns per pole a) If the variable resistor Radj in this generator's field circuit is adjusted to 63 N and the generator's prime mover is driving it at 1600 r/min, what is this generator's no-load terminal voltage? b) What would its voltage be if a 360-A load were connected to its terminals? Assume that the generator has compensating windings c) What would its voltage be if a 360-A load were connected to its terminals but the generator does not have compensating windings? Assume that its armature reaction at this load is 450 A • turns. d) What adjustment could be made to the generator to restore its terminal voltage to the value found in part a? e) How much field current would be needed to restore the terminal voltage to its no-load value? (Assume that the machine has compensating windings.) What is

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Example 7.1 A separately excited dc generator is rated at 172 kW, 430 V, 400 A, and 1800 r/min. Ra 0.05 N, Rf = 20 N, Radj = 0 to 300 N, VF = 430 V, Nf = 1 000 turns per pole a) If the variable resistor Radj in this generator's field circuit is adjusted to 63 N and the generator's prime mover is driving it at 1600 r/min, what is this generator's no-load terminal voltage? b) What would its voltage be if a 360-A load were connected to its terminals? Assume that the generator has compensating windings c) What would its voltage be if a 360-A load were connected to its terminals but the generator does not have compensating windings? Assume that its armature reaction at this load is 450 A • turns. d) What adjustment could be made to the generator to restore its terminal voltage to the value found in part a? e) How much field current would be needed to restore the terminal voltage to its no-load value? (Assume that the machine has compensating windings.) What is the required value for the resistor Radj to accomplish this?
Transcribed Image Text:Example 7.1 A separately excited dc generator is rated at 172 kW, 430 V, 400 A, and 1800 r/min. Ra 0.05 N, Rf = 20 N, Radj = 0 to 300 N, VF = 430 V, Nf = 1 000 turns per pole a) If the variable resistor Radj in this generator's field circuit is adjusted to 63 N and the generator's prime mover is driving it at 1600 r/min, what is this generator's no-load terminal voltage? b) What would its voltage be if a 360-A load were connected to its terminals? Assume that the generator has compensating windings c) What would its voltage be if a 360-A load were connected to its terminals but the generator does not have compensating windings? Assume that its armature reaction at this load is 450 A • turns. d) What adjustment could be made to the generator to restore its terminal voltage to the value found in part a? e) How much field current would be needed to restore the terminal voltage to its no-load value? (Assume that the machine has compensating windings.) What is the required value for the resistor Radj to accomplish this?
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