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Class 4 (4th Engineer) MET 📅 Oct 2024

Exam Question

Explain clearly why, in D.C. installation, a compound-wound electric generator is usually adopted for ship lighting purposes. Compare its performance with that of shunt and series wound machines. What attention does such a machine require when working and what care is necessary for its maintenance in a satisfactory condition? (16)

Reference Answer

### Introduction and Principle
For D.C. installations aboard a ship, particularly for lighting circuits, the **cumulatively compound-wound generator** is the preferred choice. This is due to its inherent ability to maintain a nearly constant terminal voltage across a wide range of electrical loads, a critical requirement for stable, flicker-free illumination.
A compound-wound generator incorporates both a **shunt field winding** and a **series field winding** on the same field poles.
* **Shunt Winding**: Consists of many turns of fine wire and is connected in parallel with the armature. It provides the main magnetic flux and is responsible for the basic voltage generation, similar to a shunt generator.

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