Three-phase system and generator connections

What is the main advantage of three-phase systems over single-phase systems?

• Lower voltage

• Better energy efficiency and stability

• Higher phase number

• Higher load capacity

In which connection will the phase voltage be lower than the line voltage?

• Delta connection

• Star connection

• Network connection

• Closed-loop connection

What is the phase shift characteristic in a three-phase system?

• 90°

• 120°

• 180°

• 360°

Which system requires higher voltage insulation between the coils?

• Star connection

• Delta connection

• Both systems require the same

• Neither

What happens in a three-phase system when the three phases operate under balanced load?

• Current flows through the neutral conductor

• No current in the neutral conductor

• All phases synchronize

• Line voltage decreases

What is the relationship between phase voltage and line voltage in a star-connected system?

• U_line = U_phase

• U_line = √2 * U_phase

• U_line = √3 * U_phase

• U_line = 2 * U_phase

In which generator connection is a three-phase alternating current generator required?

• Star connection

• Delta connection

• Both

• Single-phase generator connection

What characterizes three-phase asynchronous motors?

• Complex starting system

• Prone to overheating

• Simple structure, no brushes or commutator needed

• Only operate at low voltage

What happens if one phase is overloaded in a three-phase system?

• The other two phases are relieved

• The system balances

• Voltage fluctuations and overload may occur

• The neutral phase increases the load

What is the main application of three-phase systems in electricity distribution?

• Low voltage consumers

• High power consumers and motors

• Charging electric vehicles

• In all cases, a single-phase system is used