Class 4 (4th Engineer) MET 📅 Jun 2023

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 200 Ω. It is driven at 1000 RPM. (10)

(i) Calculate 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
A DC Generator and a DC Motor are structurally almost identical, but they differ fundamentally in their function, principle of operation, and the direction of energy conversion. The key distinctions are outlined below:
| Feature | DC Generator | DC Motor |
|--------------------------|----------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------|

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