Electrical Engineering XYZ MCQs
Armature reaction in DC generators results in:
- Open circuit
- Reduction in generated EMF
- Increase in slip
- Short circuit
Correct answer: 3. Reduction in generated EMF
Explanation: Armature reaction refers to the magnetic effect produced by the armature current in a DC generator. When current flows through the armature winding, it creates its own magnetic field. This magnetic field interacts with the main magnetic field produced by the field winding, leading to certain effects.
In a DC generator, the main magnetic field is produced by the field winding, and the armature winding is where the voltage is generated. The interaction between the armature current and the main magnetic field causes a distortion in the overall magnetic field.
This distortion can result in a reduction in the generated electromotive force (EMF) at the terminals of the generator. The armature reaction can either weaken or strengthen the main magnetic field, leading to a decrease or increase in the generated EMF.
Therefore, the correct statement is that Armature reaction in DC generators results in a Reduction in generated EMF.