Parameters of single and three phase TL with double circuits

What is the advantage of a double circuit transmission line compared to a single circuit transmission line?

• a) Higher power transfer capability
• b) Less expensive
• c) Lower maintenance cost
• d) Shorter transmission distance

What is the term used to describe the distance between the two conductors in a double circuit transmission line?

• a) Span
• b) Sag
• c) Bundle
• d) Shield

What is the impact of increasing the spacing between the two conductors of a double circuit transmission line?

• a) Increases inductance
• b) Decreases capacitance
• c) Decreases the voltage drop
• d) Increases the power transfer capability

Why is bundle conductor used in double circuit transmission lines?

• a) To increase the power transfer capability
• b) To reduce the sag
• c) To reduce the corona effect
• d) To decrease the skin effect

What is the purpose of a spacer damper in a double circuit transmission line?

• a) To provide insulation between the conductors
• b) To dampen the vibrations of the conductors
• c) To increase the power transfer capability
• d) To reduce the sag

What is the effect of increasing the number of circuits on a transmission tower?

• a) Increases the cost of the tower
• b) Decreases the power transfer capability
• c) Increases the weight of the tower
• d) Reduces the number of towers required

Which parameter of a double circuit transmission line increases when the spacing between the two circuits is decreased?

• a) Capacitance
• b) Inductance
• c) Resistance
• d) Voltage drop

What is the term used to describe the electric field that is created when the voltage gradient between the conductors is high enough to ionize the air?

• a) Capacitance
• b) Inductance
• c) Resistance
• d) Corona

How does the skin effect impact the resistance of a double circuit transmission line?

• a) Increases the resistance
• b) Decreases the resistance
• c) Has no impact on the resistance
• d) Increases the inductance

Why is the corona effect undesirable in double circuit transmission lines?

• a) It causes audible noise
• b) It reduces the power transfer capability
• c) It causes the insulation to deteriorate
• d) It increases the risk of a short circuit