🔍 Key Concepts

• Trace how the motor field windings are connected compared to the armature (propulsion armature loop) in the diagram. • Notice which components are fed from the controlled rectifier and which are fed from the non-controlled rectifier. • Recall the difference between shunt-wound and series-wound DC motors in terms of how the field coils are energized.

💭 Think About

• Follow the thick propulsion armature loop and ask: are the field windings in that same series path, or are they supplied separately? • Look at the labels ‘Motor Field’, ‘Field Rheostat’, and the rectifier symbol on the right: what does that tell you about how the field current is controlled? • Compare the connection of the motor fields to the source marked ‘Non-Controlled Rectifier’ with the text in the answer choices. Which wording matches that arrangement?.

✅ Before You Answer

• Verify whether the motor field leads physically join the armature loop or branch off to a separate supply. • Confirm which rectifier (controlled vs non-controlled) is feeding the motor field circuits in the illustration. • Eliminate any option that describes the field being in series with the armature, if the diagram does not show that series connection.