Capacitance of a three phase circuit - MCQs with Answers

Capacitance of a three phase circuit - MCQs with Answers

Q1. What happens if the separation between the three phases of the transmission line is increased?

a. The inductance will increase and capacitance will remain unchanged.
b. Both inductance and capacitance will decrease.
c. Inductance will increase and capacitance will decrease.
d. Inductance will decrease and capacitance will increase.

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Q2. What will be the capacitance of a 100 km long, 3 phase, 50Hz overhead transmission line consisting of 3 conductors, each of 2 cm and spaced 2.5 m at the corners of an equilateral triangle?

a. 1.007 μ F/phase
b. 2.0075 μ F/phase
c. 2.5 μ F/phase
d. 1.45 μ F/phase

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Q3. If the double circuit 3 phase line has conductors of diameter 2 cm and distance of separation 2m in hexagonal spacing. What is the phase to neutral capacitance for 150km of line?

a. 2.4939 μ F
b. 3.7408 μ F
c. 1.8245 μ F
d. 3.2548 μ F

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Q4. What is the charging current per km for the transmission line shown in the figure. Operating at 132 kV, the conductor diameter is 0.8 cm.



a. 0.314 A/km
b. 0.21 A/km
c. 0.45 A/km
d. 0.11 A/km

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