An induction motor is fed from a balanced three phase supply at rated voltage and frequency through a hank of three single phase transformers connected in delta-delta.
One unit of the bank develops fault and is removed.
Then
A. single phasing will occur and the machine fails to start.
B. single phasing will not occur but the motor terminal voltages will become unbalanced and the machine can be loaded to the extent of 57.7% of its rating.
C. the machine can be loaded to the extent of 57.7% of its rating with balanced supply at its terminals.
D. the machine can be loaded to the extent of 66 2/3 % of its rating with balanced supply at its terminals.
Show Answer
Answer: A
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