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Electrical Engineering - Three-Phase Systems in Power Applications

Exercise

"Loneliness is the most terrible poverty."
- Mother Teresa
1. 

In a three-phase system, the voltages are separated by
A. 45°B. 90°
C. 120°D. 180°
2. 

In a three-phase system, when the loads are perfectly balanced, the neutral current is
A. zero
B. one-third of maximum
C. two-thirds of maximum
D. at maximum
3. 

In a -connected source driving a -connected load, the
A. load voltage and line voltage are one-third the source voltage for a given phase
B. load voltage and line voltage are two-thirds the source voltage for a given phase
C. load voltage and line voltage cancel for a given phase
D. load voltage, line voltage, and source phase voltage are all equal for a given phase
4. 

In a certain three-wire Y-connected generator, the phase voltages are 2 kV. The magnitudes of the line voltages are
A. 2,000 V
B. 6,000 V
C. 666 V
D. 3,464 V
5. 

In a -connected source feeding a Y-connected load,
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

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