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The negative phase sequence in a three-phase synchronous motor exists when the motor is
Supplied with an unbalanced voltage
Supplied with an unbalanced load
Unbalanced system fault
All of the above
All of the above
Quick Trick: Identify unbalanced conditions by quickly recalling that any unbalance in voltage, load, or faults leads to negative sequence.
Identify unbalanced conditions by quickly recalling that any unbalance in voltage, load, or faults leads to negative sequence.
Recognize Unbalanced Conditions
Understand that an unbalanced voltage supply, unbalanced load, or system faults can cause negative phase sequence. Hence, all listed options contribute to this effect.
B: Supplied with an unbalanced load does not encompass all scenarios; C: Unbalanced system fault is too specific and not the only cause; D: Incorrect as it asserts only chosen options.
D is correct because all conditions can cause negative phase sequence in a synchronous motor.
Look for questions on system imbalances in other electrical machines, as they often follow the same reasoning logic.