OCC and load characteristics of different types of DC Generators

What is a separately excited DC generator?

• A type of DC generator where the field winding is supplied by a separate external DC source.

• A type of generator that runs on alternating current

• A type of generator that does not require any external power source

• A type of generator that uses a separate external source for the armature winding

How does a separately excited DC generator work?

• The field winding is supplied with AC power

• The armature winding is supplied with a separate source of DC power

• The generator works without any external power source

• The field winding is supplied with a separate source of DC power

What is a self-excited DC generator?

• A type of generator that runs on self-generated fuel

• A type of DC generator that uses residual magnetism in the field poles to generate the initial magnetic field.

• A type of generator that requires an external power source to start

• A type of generator that produces alternating current

Explain the working principle of a self-excited DC generator.

• Gravity and pressure difference

• Friction and heat generation

• Residual magnetism and field winding interaction

• Chemical reaction and energy conversion

What is a shunt-wound DC generator?

• A type of DC generator with the field winding disconnected from the armature winding.

• A type of DC generator with the field winding connected in parallel with the armature winding.

• A type of AC generator with the field winding connected in series with the armature winding.

• A type of DC generator with the field winding connected in series with the armature winding.

Describe the characteristics of a shunt-wound DC generator.

• Field winding disconnected from the armature winding

• Field winding connected to an external power source

• Field winding connected in series with the armature winding

• Field winding connected in parallel with the armature winding

What is a series-wound DC generator?

• A type of DC generator where the field winding is connected in series with the armature winding.

• A type of DC generator where the field winding is connected in parallel with the armature winding.

• A type of AC generator with no field winding.

• A type of DC generator that uses permanent magnets instead of field winding.

Discuss the load characteristics of a series-wound DC generator.

• Non-linear voltage decrease with load increase

• Non-linear voltage increase with load increase

• No change in voltage with load increase

• Linear voltage increase with load increase

What is a compound-wound DC generator?

• A type of DC generator with both series and shunt field windings

• A type of DC generator with no field windings

• A type of DC generator with only series field winding

• A type of DC generator with only shunt field winding

Explain the difference between short-shunt and long-shunt compound-wound DC generators.

• Long-shunt compound-wound DC generators have the shunt field winding disconnected from the armature winding.

• Short-shunt compound-wound DC generators have the shunt field winding connected in series with the armature winding.

• Short-shunt compound-wound DC generators have the shunt field winding connected in parallel with the armature winding, while long-shunt compound-wound DC generators have the shunt field winding connected in series with the armature winding.

• Short-shunt compound-wound DC generators have the shunt field winding connected in series with the armature winding.