Power System - I (3140914) MCQs

MCQs of Transmission Line Parameters

Showing 71 to 80 out of 103 Questions
5 6 7 8 9 10
71.
Inductance of overhead line in comparison to that of a cable of same capacity is
(a) Larger
(b) Smaller
(c) Of the same order
(d) None of above
Answer:

Option (a)

72.
Inductance of single phase two wire line is given by
(a) 0.4ln(D/r) mH/km
(b) 0.55ln(D/r) mH/km
(c) 0.4ln(r/D) mH/km
(d) 0.55ln(r/D) mH/km
Answer:

Option (a)

73.
For 11 kV line, inductance per kilometer per phase will be of the order of
(a) 1 H
(b) 0.1 H
(c) 1 mH
(d) 0.1 mH
Answer:

Option (c)

74.
For single phase overhead line having solid conductors of diameter 1 cm spaced 60 cm between centers, the inductance in mH/km is
(a) 0.05 + 0.2 log60
(b) 0.2 log60
(c) 0.05 + 0.2 log(60/0.5)
(d) 0.2 log(60/0.5)
Answer:

Option (c)

75.
The inductance of power transmission line increases with
(a) Decrease in line length
(b) Increase in diameter of conductor
(c) Increase in spacing between the conductors
(d) Increase in load current carried by conductor
Answer:

Option (c)

76.
Inductance of 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
Answer:

Option (d)

77.
For a given conductor the value of GMR is
(a) Larger for capacitance calculation
(b) Larger for inductance calculation
(c) Same for capacitance and inductance calculation
(d) None of above
Answer:

Option (a)

78.
Self GMD of a conductor with three strands each of radius r and touching each other is
(a) r(0.778×2×2)1/3
(b) r(0.778×2×2×2)
(c) r(0.778×2×2×2)3
(d) r(0.778×2×2)3
Answer:

Option (a)

79.
Hollow conductors are used in transmission lines to
(a) Reduce weight of copper
(b) Improve stability
(c) Reduce corona
(d) Increase power transmission capacity
Answer:

Option (c)

80.
Bundled conductors are employed to improve
(a) Appearance of transmission line
(b) Mechanical stability of line
(c) Current carrying capacity of line
(d) Corona performance of line
Answer:

Option (d)

Showing 71 to 80 out of 103 Questions
5 6 7 8 9 10