Question

In the given figure:

1. Identify the machine.
2. Name the parts P and Q and R of the machine.
3. Give the polarities of the magnetic poles.
4. Write the two ways of increasing the output voltage.

Answer 1

1. The given machine is DC generator (Dynamo).
2. P: Slip Rings (or Split Rings in the case of DC generator)
   Q: Carbon Brushes
   R: Armature (Rotating Coil)
3. The polarities of the magnetic poles: the upper pole is North (N) and the lower pole is South (S). (Fleming’s right-hand rule is used to calculate the polarity depending on the direction of the induced current.)
4. The ways of increasing the output voltage.
   • Increasing the speed of rotation of the armature.
   • Using stronger magnets (to increase the magneticfield strength).