MCQOPTIONS
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MCQOPTIONS
| 1. |
What is the phase current in phase Y and in phase B out of R-Y-B when sudden short circuit to all three phases occurs at no load? It is given that after fault current in phase R is equal (Vm Sin ωt)$ |
| A. | Y = V<sub>m</sub> Sin(ωt +60°) & B = V<sub>m</sub>Sin(ωt +120°) |
| B. | Y = V<sub>m</sub> Sin(ωt +120°) & B = V<sub>m</sub>Sin(ωt+240°) |
| C. | Y = V<sub>m</sub> Sin(ωt +240°) & B = V<sub>m</sub> Sin(ωt +120°) |
| D. | Y = V<sub>m</sub> Sin(ωt +90°) & B = V<sub>m</sub> Sin(ωt -90°) |
| Answer» C. Y = V<sub>m</sub> Sin(‚âà√¨‚àö¬¢t +240¬¨¬®‚Äö√†√ª) & B = V<sub>m</sub> Sin(‚âà√¨‚àö¬¢t +120¬¨¬®‚Äö√†√ª) | |