Question

A6 A 8-pole lap wound armature rotated at 600 rpm is designed to generate 240 V. The flux per pole is 0.06 Wb and the armature has 100 slots. (a) Determine the suitable number of conductors for each of the slot. (b) Based on the result found in part (a), calculate the armature voltage if its winding is changed to a wave winding and the motor speed is decreased to 200 rpm. (3 marks) (2 marks) A7 Elaborate the merits of using transformer open circuit and short circuit tests in predicting the operating performance e.g. voltage regulation and efficiency. (5 marks)

Answer 1

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A6)

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