# Electrical Engineering - Three-Phase Systems in Power Applications

### Exercise :: Three-Phase Systems in Power Applications - General Questions

11.

A three-phase generator is connected to three 90 load resistors. Each coil generates 120 V ac. A common neutral line exists. How much current flows through the common neutral line?

 A. 0 A B. 1.33 A C. 3.99 A D. 2.66 A

Explanation:

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12.

Compare the total copper cross sections in terms of current-carrying capacity for a single-phase and a three-phase 120 V system with effective load resistance of 15 .

 A. single-phase 32 A; three-phase 16 A B. single-phase 16 A; three-phase 8 A C. single-phase 8 A; three-phase 4 A D. single-phase 16 A; three-phase 0 A

Explanation:

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13.

If in a Y-connected ac generator, each phase voltage has a magnitude of 90 VRMS, what is the magnitude of each line voltage?

 A. 0 V B. 90 V C. 156 V D. 180 V

Explanation:

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14.

Polyphase generators produce simultaneous multiple sinusoidal voltages that are separated by

 A. certain constant phase angles B. certain constant frequencies C. certain constant voltages D. certain constant currents

Explanation:

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15.

In a balanced three-phase load, each phase has

 A. an equal amount of power B. one-third of total power C. two-thirds of total power D. a power consumption equal to IL