Power System - I (3140914) MCQs

MCQs of Transmission Line Parameters

Showing 1 to 10 out of 103 Questions
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1.
The presence of earth in case of overhead lines
(a) Increases the capacitance
(b) Increases the inductance
(c) Decreases the capacitance
(d) Decreases the inductance
Answer:

Option (a)

2.
Self GMD method is used to evaluate
(a) Inductance of the overhead transmission lines
(b) Capacitance of the overhead transmission lines
(c) Inductance and capacitance both of the overhead transmission lines
(d) None of above
Answer:

Option (a)

3.
The inductance of single-phase, two-wire transmission line per kilometer gets doubled when the
(a) Distance between the wires is doubled
(b) Distance between the wires is increased four fold
(c) Distance between the wires is increased as square of original distance
(d) Radius of the wire is doubled
Answer:

Option (c)

4.
Transmission lines are transposed to
(a) Reduce copper loss
(b) Reduce skin effect
(c) Prevent interference with neighbouring telephone lines
(d) Prevent short-circuit between any two lines.
Answer:

Option (c)

5.
If the effect of earth is taken into account, then the capacitance of line to ground
(a) Decreases
(b) Increases
(c) Remains unaltered
(d) Becomes infinite
Answer:

Option (b)

6.
Bundled conductors in EHV transmission system provide
(a) Reduced capacitance
(b) Increased capacitance
(c) Increased inductance
(d) Increased voltage gradient
Answer:

Option (b)

7.
The self-inductance of a long cylindrical conductor due to its internal flux linkages is 1 kH/m. If the diameter of the conductor is doubled, then the self-inductance of the conductor due to its internal flux linkages would be
(a) 0.5 kH/m
(b) 1 kH/m
(c) 1.414 kH/m
(d) 4 kH/m
Answer:

Option (b)

8.
Two arrangements of conductors are proposed for a 3-phase transmission line: one with equilateral spacing of 4 m and the other a flat with 4 m between the conductors. The conductor diameter in each case is 2 cm. Assuming that the line is transposed in both cases. Which one of the following statements would be true?
(Cn = capacitance in F/m line to neutral, L = inductance in H/m per phase)
(a) Cn1 = Cn2 and L1 > L2
(b) Cn1 > Cn2 and L1 < L2
(c) Cn1 < Cn2 and L1 > L2
(d) Cn1 > Cn2 and L1 = L2
Answer:

Option (b)

9.
When bundle conductors are used in place of single conductors, the effective inductance and capacitance will respectively
(a) Increase and decrease
(b) Decrease and increase
(c) Decrease and remain unaffected
(d) Remain unaffected and increase
Answer:

Option (b)

10.
The inductance of a three-phase transmission line is 1.2 mH/phase/km. If the spacing of conductors and the radius of the conductor are doubled, then the inductance of the line will be
(a) 4.8 mH/phase/km
(b) 1.2 mH/phase/km
(c) ln2 × 1.2 mH/phase/km
(d) ln4) × 1.2 mH/phase/km
Answer:

Option (b)

Showing 1 to 10 out of 103 Questions
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