Effects of earth on the capacitance of the transmission line

What is the primary reason for the increase in capacitance between conductors and ground when the ground is moist?

• A. Reduced permittivity of soil
• B. Increased permittivity of soil
• C. Increased conductivity of soil
• D. Reduced conductivity of soil

What is the effect of increasing the separation between conductors on the capacitance of the transmission line?

• A. Increases capacitance
• B. Decreases capacitance
• C. Does not affect capacitance
• D. None of the above

Which of the following factors can affect the self-capacitance of a transmission line?

• A. Distance between conductors
• B. Length of the line
• C. Shape of the conductors
• D. All of the above

What is the typical range of capacitance per kilometer of a three-phase overhead transmission line?

• A. 0.05 to 0.15 μF/km
• B. 0.15 to 0.30 μF/km
• C. 0.30 to 0.45 μF/km
• D. 0.45 to 0.60 μF/km

Which of the following factors can affect the mutual capacitance of a transmission line?

• A. Distance between conductors
• B. Length of the line
• C. Relative position of conductors
• D. All of the above

What is the effect of increasing the frequency on the skin effect of a conductor?

• A. Increases the skin depth
• B. Decreases the skin depth
• C. Does not affect the skin depth
• D. None of the above

Which of the following is an example of a real-world problem caused by the effects of earth on the capacitance of a transmission line?

• A. Interference from radio signals
• B. Overheating of conductors
• C. Excessive voltage drop
• D. Inductive interference

What is the primary reason for using a ground wire on a transmission line?

• A. To reduce the effects of earth capacitance
• B. To reduce the effects of inductive interference
• C. To improve the mechanical stability of the line
• D. To improve the conductivity of the line