Which of the following is the commonly used generator in a DC welding machine? 

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RRB JE EE 22 Apr 2025 Shift 1 CBT 2 Official Paper
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  1. Shunt generator
  2. Permanent magnet generator
  3. Compound generator 
  4. Series generator

Answer (Detailed Solution Below)

Option 3 : Compound generator 
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Detailed Solution

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Applications of DC generators

Compound generator:

A compound generator is commonly used in DC welding machines because it combines the characteristics of both series and shunt generators:

  • It provides a relatively stable voltage (like a shunt generator).
  • It can handle sudden load changes well (like a series generator).
  • This ensures a consistent arc, which is crucial for welding quality.


Shunt generator:

  • Shunt generators are known for providing a relatively constant output voltage, making them suitable for several practical applications such as battery charging, electroplating and electrolysis.


Series generator:

  • Used in early electric traction, arc lighting, and boosting voltage in long DC lines.


Permanent magnet generator:

  • Used in wind turbines, small hydro generators, bicycles (dynamo), portable generators, engine ignition systems, and renewable energy systems for efficient, maintenance-free power generation.
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