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A 155 V, DC separately excited motor drives a constant-torque load at 1400 rpm speed. The armature and field resistances are 0.7 N and 150 N, respectively. The motor draws a line current of 10 A at the given load and the field voltage is 103 V. Answer the following questions. 1- Calculate the resistance that should be added Radd 2 to the armature circuit to If Radd 1 reduce the speed by 95%.

A 155 V, DC separately excited motor drives a constant-torque load at 1400 rpm speed. The armature and field resistances are 0.7 N and 150 N, respectively. The motor draws a line current of 10 A at the given load and the field voltage is 103 V. Answer the following questions. 1- Calculate the resistance that should be added Radd 2 to the armature circuit to If Radd 1 reduce the speed by 95%.

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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A 155 V, DC separately excited motor drives a constant-torque load at 1400 rpm speed. The armature and field resistances are 0.7 N and 150 2, respectively. The motor draws a line current of 10 A at the given load and the field voltage is 103 V. Answer the following questions. 1- Calculate the resistance that should be added Radd 2 to the armature circuit to Radd reduce the speed by 95%. Radd Ω 2- Calculate the efficiency of the motor without the added Radd N if the E. I, rotational losses is equal to 162.07 W. V; Rf V, % 3- Calculate the efficiency of the motor Ra with the added Radd N if the rotational losses is equal to 162.07 W. n = % 4- Calculate the resistance that must be added to the armature circuit to operate the motor at the holding condition. Radd U
Transcribed Image Text:A 155 V, DC separately excited motor drives a constant-torque load at 1400 rpm speed. The armature and field resistances are 0.7 N and 150 2, respectively. The motor draws a line current of 10 A at the given load and the field voltage is 103 V. Answer the following questions. 1- Calculate the resistance that should be added Radd 2 to the armature circuit to Radd reduce the speed by 95%. Radd Ω 2- Calculate the efficiency of the motor without the added Radd N if the E. I, rotational losses is equal to 162.07 W. V; Rf V, % 3- Calculate the efficiency of the motor Ra with the added Radd N if the rotational losses is equal to 162.07 W. n = % 4- Calculate the resistance that must be added to the armature circuit to operate the motor at the holding condition. Radd U
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