In a certain three-wire Y-connected generator, the phase voltages are 2 kV. The

CuriousTab

CuriousTab

Home Aptitude

Discussion

Home ‣ Electrical Engineering ‣ Three-Phase Systems in Power Applications Comments

Question
In a certain three-wire Y-connected generator, the phase voltages are 2 kV. The magnitudes of the line voltages are
Options
A. 2,000 V
B. 6,000 V
C. 666 V
D. 3,464 V

Correct Answer

3,464 V

Three-Phase Systems in Power Applications problems

Search Results

2. 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

4. 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

5. 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

8. In a △-connected source feeding a Y-connected load,
Options
A. each phase voltage equals the difference of the corresponding load voltages
B. each phase voltage equals the corresponding load voltage
C. each phase voltage is one-third the corresponding load voltage
D. each phase voltage is 60� out of phase with the corresponding load voltage

10. In a Y-connected circuit, the magnitude of each line current is
Options
A. one-third the phase current
B. three times the corresponding phase current
C. equal to the corresponding phase current
D. zero

Comments

More in Electrical Engineering: