A direct current motor is connected to a 250-volt dc supply. The armature has a current draw of 165 amps when operating on a full load. You have been assigned the task of connecting two resistors in the armature circuit to provide speed control for the motor. When both resistors are connected in the circuit, the armature is to be limited to 50% of the full-load current draw. When only one resistor is connected in the circuit, the armaturecurrent is to be limited to 85% of full-load current. Determine the ohmic value and minimum power rating of each resistor.
A direct current motor is connected to a 250-volt dc supply. The armature has a current draw of 165 amps when operating on a full load. You have been assigned the task of connecting two resistors in the armature circuit to provide speed control for the motor. When both resistors are connected in the circuit, the armature is to be limited to 50% of the full-load current draw. When only one resistor is connected in the circuit, the armaturecurrent is to be limited to 85% of full-load current. Determine the ohmic value and minimum power rating of each resistor.
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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A direct current motor is connected to a 250-volt dc supply. The armature has a current draw of 165 amps when operating on a full load. You have been assigned the task of connecting two resistors in the armature circuit to provide speed control for the motor. When both resistors are connected in the circuit, the armature is to be limited to 50% of the full-load current draw. When only one resistor is connected in the circuit, the armaturecurrent is to be limited to 85% of full-load current. Determine the ohmic value and minimum power rating of each resistor.
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