Power Circle diagrams

What is the purpose of a power circle diagram?

• To represent the power flow between generators, transformers, and loads in an electrical system
• To represent the reactive power flow between generators, transformers, and loads in an electrical system
• To represent the voltage drop and current flow in an electrical system
• To represent the resistance and reactance of a transmission line in an electrical system

In a power circle diagram, what does the length of the radius of the circle represent?

• Apparent power
• Reactive power
• Real power
• Impedance

What is the power factor angle in a power circle diagram?

• The angle between the voltage phasor and the current phasor
• The angle between the real power and the reactive power in the system
• The angle between the resistance and the reactance of a transmission line in the system
• The angle between the apparent power and the real power in the system

In a power circle diagram, what is the relationship between the radius and the angle of the circle?

• As the angle increases, the radius decreases
• As the angle increases, the radius increases
• There is no relationship between the radius and the angle of the circle
• The radius is constant for all angles of the circle

What is the equation for the power factor in a power circle diagram?

• cos(φ) = Real Power / Apparent Power
• cos(φ) = Real Power / Reactive Power
• cos(φ) = Reactive Power / Apparent Power
• cos(φ) = Voltage / Current

In a power circle diagram, what is the range of possible values for the power factor angle?

• 0° to 90°
• 0° to 180°
• -90° to 0°
• -180° to 180°