Line Inductance of a single phase circuit - MCQs with Answers

Line Inductance of a single phase circuit - MCQs with Answers

Q1. What is the total resistance in a single phase or 2 – wire dc line?

a. Equal to the resistance of either conductor.
b. Double the resistance of either conductor.
c. Half of the resistance of either conductor.
d. None of these.

View Answer / Hide Answer

Q2. The inductance of a single phase two wire power transmission line per km gets doubled when

a. Distance between the wires is doubled.
b. Distance between the wires increased fourfold.
c. Distance between the wires is increased as the square of the original distance.
d. Radius of the wire is doubled.

View Answer / Hide Answer

Q3. The inductance of a power transmission line increases with

a. Decrease in line length.
b. Increase in diameter of conductor.
c. Increasing in spacing between the phase conductors.
d. Increase in load current carried by the conductors.

View Answer / Hide Answer

Q4. Inductance of a single phase two parallel wire transmission line having conductor radius r and spacing D between conductors is equal to

a. 2 π * 10^-7l_n D / r
b. 4 * 10^-7l_n D / r
c. 4 π * 10^-7l_n D / r
d. 2 * 10^-7l_n D / r

View Answer / Hide Answer

Q5. For a single phase overhead line having solid copper conductors of diameter 1 cm spaced 90 cm between the centres, the inductance in mH/km is

a. 0.05 + 0.2 l_n 90
b. 0.2 l_n 90
c. 0.05 + 0.2 l_n (90/0.5)
d. 0.2 l_n (90/0.5)

View Answer / Hide Answer

Q6. The conductor of a 15 km long, single phase two wire line are separated by a distance of 1.5 m. The diameter of each conductor is 1 cm. If the conductors are of copper, the inductance of the circuit is

a. 23.81 mH
b. 35.72 mH
c. 32.81 mH
d. 53.72 mH

View Answer / Hide Answer

Q7. The inductance of a transmission line is minimum when_____________

a. GMD is high.
b. GMR is high.
c. Both GMD and GMR are high.
d. GMD is low and GMR is high.

View Answer / Hide Answer

Q8. A single phase line has two parallel conductors 2 metre apart. The diameter of each conductor is 1.2 cm. What is the loop inductance per km of the line?

a. 2.423 mH
b. 1.234 mH
c. 3.267 mH
d. 8.632 mH

View Answer / Hide Answer