225. The phase System is sequence
A. BRY
B.YRB
C.RBY
D. none of the above
226. In a star-connected system, the relation between the line voltage VL and phase voltage "ph is
A. VL = Vph
B. VL = Vph/
C. VL =Vph
D. none of the above
227. 1f the load connected to the 3-phase generator shown in Fig. 5.23 has a lagging p.f. of cos 4), then phase angle between VRy and IR is
A. 30?
B. 30? ?4)
C. 60?
D. I20?-4
228. In a 3-phase system, VyN = 100 ?120?V and VBN = 100 L 120? V. What is V ?
A. 170 L 90? V
B. 173 L ? 90? V
C. 200 L 60? V
D. none of the above
229. The algebraic sum of instantaneous phase voltages in a three-phase circuit is equal to
A. zero
B. line voltage
C. phase voltage
D. none of the above
230. A 3-phase load is balanced if all the three phase have the same
A. impedance
B. power factor
C. impedance and power factor
D. none of the above
231. 1n Fig. 5.24, line currents are behind the respective phase currents.
A. 0-8 lagging
B. 0.6 lagging
C. 0.75 lagging
D. none of the above
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