Class 4 (4th Engineer) MET 📅 Dec 2025

Exam Question

(a) What is the difference between a DC Generator and a DC motor? (6)

(b) A 4-pole, 32 conductor, lap-wound DC shunt generator with terminal voltage of 200 V delivering 12 A to the load has Ra = 2 and field circuit resistance of 200Ω. It is driven at 1000 RPM. Calculate (10)

(i) the flux per pole in the machine.

(ii) If the machine has to be run as motor with the same terminal voltage and drawing 5 A from mains, maintaining the same magnetic field, find the speed of the machine.

Reference Answer

### (a) Difference between a DC Generator and a DC Motor (6 Marks)
While structurally identical, a DC generator and a DC motor are distinguished by their function, principle of operation, and the direction of energy flow. A single DC machine can typically operate in either mode.
| Feature | DC Generator | DC Motor |
| ------------------------ | ----------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------- |

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