Electrical Engineering XYZ MCQs
The shunt resistance component equivalent circuit obtained by no load test of an induction motor representative of:
- Core loss only
- Copper loss
- Windage and friction loss
- All of these
Correct answer: 1. Core loss only
Explanation: During the no-load test of an induction motor, the primary objective is to determine the core loss, which includes both hysteresis loss and eddy current loss in the iron core of the motor. The no-load test is conducted by running the motor at rated voltage and frequency with no mechanical load attached.
In the equivalent circuit obtained from the no-load test, the shunt branch represents the core loss. The shunt resistance (Rc) in the equivalent circuit corresponds to the resistance of the iron core, and the reactance (Xc) represents the core’s inductive reactance.