In a three phase alternating current (AC) generator, the voltage generated across the third pair of coils with reference to slip rings has a phase of
Correct answer: C. 120°
- A. 0°
- B. 90°
- C. 120°
- D. 240°
Explanation
In a three-phase AC generator, each of the three phases is separated by 120°. This means that for the third pair of coils, the phase difference with reference to slip rings will be 120°. The other options do not align with the phase differences specific to a three-phase system: 0° is not possible because it would imply no phase difference; 90° is typical of a two-phase system; 240° would be the phase difference of the second pair with respect to the first, not the third.
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About Phase of Alternating Current
Phase describes the position of an alternating voltage or current within its cycle and the phase difference between two sinusoidal quantities. The topic covers in phase signals, phase angle and lead or lag in resistive, inductive and capacitive circuits, rather than the amplitude or frequency of the supply.
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