1. In a balanced three-phase Y-connected system, the line voltage and the COrresponding phase voltage are displaced from each other by. B. 30 A. 0 C. 90 D. 120 2. In balanced star (wye) connected system, the line voltage is A. 0.707 times the phase voltage C phasor sum of two phase voltages B. phasor difference of 2 phase V D. 1.414 times the phase voltage REE - May 2008 3. A three-phase system has line to line voltage Vab = 1,500 Vrms with 30 angle with a wye load. Determine the phase voltage. A.-433+j750 Vrms B. 750 +j433 Vrms C. j866 Vrms D. 866 Vrms * REE - September 2007 4. The wye connected three-phase voltage source has V. = 115 Vrms with -240 angle. Find the line to line voltage Vpe- B. 199 + j0 Vrms D. 99 j173 Vrms A.-99 j173 Vrms C.0-j199 rms REE - April 2002 5. Three 10-ohm resistors connected in wye are supplied from a balanced three phase source where phase A line voltage is given by 230sin377t. What is the phase A line current? A. 13.28sin377t B. 13. 28sin(377t 30) D. 40sin(377t + 30) C. 23 sin(377t 30) REE September 2011 6. A balanced three-phase 4, 157 Vrms source supplies a balnced three-phase delta-connected load of 38.4 + j28. 8 N. Find the current in line A with V reference. Qn as A. 120 j90 A B. 120 + j90A C.-120 + j90 A D. -120 - 190 A 7. A system consist of three equal resistors connected in delta and is fed from a balanced three-phase supply. How much power is reduced if one of the resistors is disconnected? A. 33 % B. 50 % C. 25 % D. 0 % REE - Anril 2005