Which of the following generator will have negligible terminal voltage while running on no-load?

Series Connection: In a series generator, the field winding is connected in series with the armature winding. This means that the field current (and thus, the magnetic field strength) depends entirely on the load current.
No-Load Condition: When there's no load connected, the load current is zero. Consequently, no current flows through the field winding, resulting in a negligible magnetic field.
Negligible Voltage: With a very weak magnetic field, the generator cannot induce a significant voltage in the armature windings, leading to a negligible terminal voltage.
Visual Representation:
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DC series generator circuit diagram

Key Points:

This characteristic of series generators makes them unsuitable for applications where a constant voltage is required, such as supplying power to lighting loads.
Series generators are primarily used in applications where a varying voltage output is needed, like in certain types of arc welding equipment