Numerical -B phase for given balanced 3 phase,4 wire ac system

Q.  In a balanced 3 phase, 4 wire ac system the phase sequence is RYB. If the voltage of R phase = 230 ∠ 0° volts, then what will be the B phase?
- Published on 23 Nov 15

a. 230 ∠ - 120°
b. 230 ∠ - 90°
c. 230 ∠ - 90°
d. 230 ∠ - 120°

ANSWER: 230 ∠ - 120°

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