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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