A DC separately excited motor drives a centrifugal pump at a speed of 1100 rpm when the terminal voltage and line currents are 215 V and 56 A, respectively. The armature and field resistances are 0.2 N and 145, respectively. 1- Calculate the resistance that should Quality Control in Construction: Centrifugal Pump be added Radd N to the armature circuit to reduce the speed to 770 rpm. Radd 2- Design a starting resistance for a maximum starting current of 112 A in the armature circuit. Radd Ω
A DC separately excited motor drives a centrifugal pump at a speed of 1100 rpm when the terminal voltage and line currents are 215 V and 56 A, respectively. The armature and field resistances are 0.2 N and 145, respectively. 1- Calculate the resistance that should Quality Control in Construction: Centrifugal Pump be added Radd N to the armature circuit to reduce the speed to 770 rpm. Radd 2- Design a starting resistance for a maximum starting current of 112 A in the armature circuit. Radd Ω
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Transcribed Image Text:A DC separately excited motor drives a centrifugal pump at a speed of 1100 rpm when
the terminal voltage and line currents are 215 V and 56 A, respectively. The armature and field
resistances are 0.2 N and 1452, respectively.
1- Calculate the resistance that should Quality Control in Construction: Centrifugal Pump
be added Radd n to the armature
circuit to reduce the speed to 770 rpm.
Radd
Ω
2- Design a starting resistance for a
maximum starting current of 112 A in
the armature circuit.
Radd
4- Calculate the resistance that must be added to the armature circuit to operate the motor at
the holding condition.
Radd
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