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1. Three 3.33 Q resistance are connected in delta across 220 V, 3 phase supply. The equivalent wye connected resistance is a. 1.110 c. 6.7 0 d. 10 0 b. 20 0 3. The primary of 34.5/13.8 kV, 75 MVA transformer is wye grounded. The three primary currents are: la = 7202 - 30 Determine the neutral current I, = 6952209 I = 710488 a. 42.39417.34 b. 57.812- 15.21 c. 30.2220.51 d. 14.134- 12.31 ----- -. 6. The line current of unbalanced delta connected load are: I, = 40240 Detemine the phase b zero sequence component b. 45 - j2.9 a = 5020 I = 45.84130.9 a. 0 c. 16 + j17.25 d. 5-j2.9 7. Three identical resistors are connected in delta across a balance, 3-phase source. If one of the resistors is open, a. power will become double b. power is reduced to 33% c. power will become three times the original d. power will increase to 66%

1. Three 3.33 Q resistance are connected in delta across 220 V, 3 phase supply. The equivalent wye connected resistance is a. 1.110 c. 6.7 0 d. 10 0 b. 20 0 3. The primary of 34.5/13.8 kV, 75 MVA transformer is wye grounded. The three primary currents are: la = 7202 - 30 Determine the neutral current I, = 6952209 I = 710488 a. 42.39417.34 b. 57.812- 15.21 c. 30.2220.51 d. 14.134- 12.31 ----- -. 6. The line current of unbalanced delta connected load are: I, = 40240 Detemine the phase b zero sequence component b. 45 - j2.9 a = 5020 I = 45.84130.9 a. 0 c. 16 + j17.25 d. 5-j2.9 7. Three identical resistors are connected in delta across a balance, 3-phase source. If one of the resistors is open, a. power will become double b. power is reduced to 33% c. power will become three times the original d. power will increase to 66%

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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1. Three 3.33 Q resistance are connected in delta across 220 V, 3 phase supply. The equivalent wye connected resistance is a. 1.110 c. 6.7 0 d. 10 0 b. 20 0 3. The primary of 34.5/13.8 kV, 75 MVA transformer is wye grounded. The three primary currents are: I, = 6952209 4 = 7202 – 30 Determine the neutral current I = 710488 a. 42.39417.34 b. 57.812 - 15.21 c. 30.2220.51 d. 14.132 - 12.31 ----- -. 6. The line current of unbalanced delta connected load are: I, = 40240 Detemine the phase b zero sequence component b. 45 - j2.9 la = 5020 I = 45.84130.9 a. 0 c. 16 + j17.25 d. 5- j2.9 7. Three identical resistors are connected in delta across a balance, 3-phase source. If one of the resistors is оpen,. a. power will become double b. power is reduced to 33% c. power will become three times the original d. power will increase to 66%
Transcribed Image Text:1. Three 3.33 Q resistance are connected in delta across 220 V, 3 phase supply. The equivalent wye connected resistance is a. 1.110 c. 6.7 0 d. 10 0 b. 20 0 3. The primary of 34.5/13.8 kV, 75 MVA transformer is wye grounded. The three primary currents are: I, = 6952209 4 = 7202 – 30 Determine the neutral current I = 710488 a. 42.39417.34 b. 57.812 - 15.21 c. 30.2220.51 d. 14.132 - 12.31 ----- -. 6. The line current of unbalanced delta connected load are: I, = 40240 Detemine the phase b zero sequence component b. 45 - j2.9 la = 5020 I = 45.84130.9 a. 0 c. 16 + j17.25 d. 5- j2.9 7. Three identical resistors are connected in delta across a balance, 3-phase source. If one of the resistors is оpen,. a. power will become double b. power is reduced to 33% c. power will become three times the original d. power will increase to 66%
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