225.  The phase System is sequence
A. BRY
B.YRB
C.RBY
D. none of the above

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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

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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

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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

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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

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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

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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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