Three-Phase Check

1. In a three-phase system, the three phases are separated by:

90 degrees120 degrees180 degrees360 degrees

2. Line voltage in a three-phase system is:

The same as phase voltageLower than phase voltageHigher than phase voltage by a factor of √3 (about 1.73)Unpredictable

3. Three-phase systems are preferred in industry because:

They use less wirePower delivery is smoother and motors are simpler and more efficientThey are cheaper than single-phaseThey deliver more voltage