Armature resistance of a 230V shunt motor is 0.6 0 and no load current is 5A. When the rotor is loaded it is taking armature current of 60A. The speed is 1200rpm.Estimate the back emf for loaded conditions. a. 194 V b. 200 V c. 230 V d. 220 V

Armature resistance of a 230V shunt motor is 0.6 0 and no load current is 5A. When the rotor is loaded it is taking armature current of 60A. The speed is 1200rpm.Estimate the back emf for loaded conditions. a. 194 V b. 200 V c. 230 V d. 220 V

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

Synchronous Generator

In comparison to an asynchronous generator, it is a machine where the rotor speed is equal to the rotating magnetic field produced by the stator, i.e., mechanical speed is equal to the electrical speed, thus called synchronous, and not asynchronous.

Salient Pole Rotor

Salient pole rotor includes a large number of exposed poles mounted on a magnetic wheel. The construction of a bright pole is as shown in the image on the left. The proposed poles are made of metal laminations. The rotor winding is provided on these poles and is supported by pole shoes.

Question

Armature resistance of a 230V shunt motor
is 0.6 0 and no load current is 5A. When the
rotor is loaded it is taking armature current
of 60A. The speed is 1200rpm.Estimate the
back emf for loaded conditions.
a. 194 V
b. 200 V
c. 230 V
d. 220 V

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