If in a Y-connected ac generator, each phase voltage has a magnitude of 90 VRMS,

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Question
If in a Y-connected ac generator, each phase voltage has a magnitude of 90 V_RMS, what is the magnitude of each line voltage?
Options
A. 0 V
B. 90 V
C. 156 V
D. 180 V

Correct Answer

156 V

Three-Phase Systems in Power Applications problems

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1. For the circuit shown, determine Z_TH for the portion of the circuit external to R_L.
Options
A. 66.7 ∠?33.7� kΩ
B. 6.67∠?333.7� kΩ
C. 14.4 ∠?56.3� kΩ
D. 1.44 ∠?33.7� kΩ

2. In order to get maximum power transfer from a capacitive source, the load must
Options
A. have a capacitive reactance equal to circuit resistance
B. have an impedance that is the complex conjugate of the source impedance
C. be as capacitive as it is inductive
D. none of the above

4. If two currents are in the same direction at any instant of time in a given branch of a circuit, the net current at that instant
Options
A. is zero
B. is the sum of the two currents
C. is the difference between the two currents
D. cannot be determined

5. Norton's theorem gives
Options
A. an equivalent current source in parallel with an equivalent impedance
B. an equivalent current source in series with an equivalent impedance
C. an equivalent voltage source in parallel with an equivalent impedance
D. an equivalent voltage source in series with an equivalent impedance

6. A three-phase △-connected generator is driving a balanced load such that each phase current is 12 A in magnitude. When I ?_a = 12 ∠30� A, what are the polar expressions for the other phase currents?
Options
A. I _?b = 12 ∠150� A, I _?c = 12∠?90� A
B. I _?b = 12∠120� A, I _?c = 12∠30� A
C. I _?b = 12∠30� A, I _?c = 12∠120� A
D. I _?b = 12∠90� A, I _?c = 12∠90� A

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