A shunt wound de motor has an armature resistance of 2.52 and a shunt field resistance of 1602. The terminal voltage is 120 volts and the line current is 8 Amperes. Back emf is developed in the armature when the motor is running considering only the copper loss. Calculate the efficiency of the motor.

A shunt wound de motor has an armature resistance of 2.52 and a shunt field resistance of 1602. The terminal voltage is 120 volts and the line current is 8 Amperes. Back emf is developed in the armature when the motor is running considering only the copper loss. Calculate the efficiency of the motor.

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter5: Resistors

Section: Chapter Questions

Problem 1PA

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Concept explainers

Gear Motor

A gear motor is a combination of a gearbox and an electric motor. This combination of two systems is used for efficient usage of the motor. It makes a cost-effective solution for high torque, low-speed applications. These motors are used in our household as, garage door openers, alarm clocks. In commercial areas, hospital beds, cranes.

Question

A shunt wound de motor has an armature resistance of 2.52 and a shunt field resistance
of 1602. The terminal voltage is 120 volts and the line current is 8 Amperes. Back emf
is developed in the armature when the motor is running considering only the copper loss.
Calculate the efficiency of the motor.
a. 76.937%
b. 80.937%
c. 84.896%
d. 90.625%

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