41. A 1-pi line two conductors operate at 50Hz. The diameter of each conductor is 15 mm, and the spacing between the conductor is 3.5 m. The inductive reactance per km will be
(a) 0.43 ClIkm
(b) 0.65 0Jkm
(c) 0.70 O/km
(d) 0.79 nIkm
Ans: d
42. A conductor is composed of seven identical copper .Iranu, each having a radius r. The self GMD of the conductors will be
(a) 2.177 r
(b) 2.645 r
(c) 2.141 r
(d) 1.21 r
Ans: a
43. The charging current per kill of the line is
(a) 0.497 Amp
(b) 0.61 Amp
(c) 0.68 Amp
(d) 0.21 Amp
Ans: a
44. What is the time of operation of a relay of rating 5 amp 2.2 sec, IDMT and having a relay of setting of 125% Tms = 0.6 It is connected to a supply circuit through a CT, 400 ratio. The fault current is 400 amp.
(a) 10.Osec
(b) 1.92sec
(c) 4.5 sec
(d) 2.4 sec
Ans: b
45. A two conductor 1 - pi line operates at 50 Hz. The diameter of each conductor is 2 cm and are spaced 3m apart. What is the line to line capacitance
(a) 9.74 x 10-9 F/km
(b) 4.87 x 10-9 F/km
(c) 3.05 x 10-9 F/km
(d) None of these
Ans: b
46. A two conductor 1 - pi line operates at 50 Hz. The diameter of each conductor is 4 cm and are spaced 6 m apart. What is the capacitive susceptance to neutral per km?
(a) 1.42 x 10-9 s/km
(b) 3.25 x 10-8 s/km
(c) 4.8 x 10-9 s/krn
(d) 3.06 x 10-9 s/km
Ans: d
47. A three phase 50 Hz line consists of three conductors each of diameter 21 mm, The spacing between the conductors all follows: A - B = 3m, B - C = 5m, C - A = 3.6m If the line operates at 132 k V, the reactive voltampere generatd by the line per km is
(a) 51.07 kVAr
(b) 51.70 kVAr
(c) 40.0 kVAr
(d) 60.5 kVAr
Ans: b
48. A two conductor 1 - pi line operates at 50 Hz. The diameter of each conductor is 20 mm and the spacing between the conductors is 3m, The height of conductor above the ground is 6 m. The capacitance of the line to neutral will be
(a) 9.7 pF/m
(b) 10.2 pF/m
(c) 8.7 uF/km
(d) 2.4 uF/m
Ans: a
49. For a 500 Hz frequency excitation, a 50 km long power line will be modelled as
(a) short line
(b) medium line
(c) long line
(d) data isufficient decision
Ans: c
50. Bundled conductors are employed to
(a) reduce the short circuit current
(b) improve system stability
(c) decreases system stability
(d) increase the short circuit current
Ans: c
Read More Questions:
Power Systems MCQs Part1
Power Systems MCQs Part2
(a) 0.43 ClIkm
(b) 0.65 0Jkm
(c) 0.70 O/km
(d) 0.79 nIkm
Ans: d
42. A conductor is composed of seven identical copper .Iranu, each having a radius r. The self GMD of the conductors will be
(a) 2.177 r
(b) 2.645 r
(c) 2.141 r
(d) 1.21 r
Ans: a
43. The charging current per kill of the line is
(a) 0.497 Amp
(b) 0.61 Amp
(c) 0.68 Amp
(d) 0.21 Amp
Ans: a
44. What is the time of operation of a relay of rating 5 amp 2.2 sec, IDMT and having a relay of setting of 125% Tms = 0.6 It is connected to a supply circuit through a CT, 400 ratio. The fault current is 400 amp.
(a) 10.Osec
(b) 1.92sec
(c) 4.5 sec
(d) 2.4 sec
Ans: b
45. A two conductor 1 - pi line operates at 50 Hz. The diameter of each conductor is 2 cm and are spaced 3m apart. What is the line to line capacitance
(a) 9.74 x 10-9 F/km
(b) 4.87 x 10-9 F/km
(c) 3.05 x 10-9 F/km
(d) None of these
Ans: b
46. A two conductor 1 - pi line operates at 50 Hz. The diameter of each conductor is 4 cm and are spaced 6 m apart. What is the capacitive susceptance to neutral per km?
(a) 1.42 x 10-9 s/km
(b) 3.25 x 10-8 s/km
(c) 4.8 x 10-9 s/krn
(d) 3.06 x 10-9 s/km
Ans: d
47. A three phase 50 Hz line consists of three conductors each of diameter 21 mm, The spacing between the conductors all follows: A - B = 3m, B - C = 5m, C - A = 3.6m If the line operates at 132 k V, the reactive voltampere generatd by the line per km is
(a) 51.07 kVAr
(b) 51.70 kVAr
(c) 40.0 kVAr
(d) 60.5 kVAr
Ans: b
48. A two conductor 1 - pi line operates at 50 Hz. The diameter of each conductor is 20 mm and the spacing between the conductors is 3m, The height of conductor above the ground is 6 m. The capacitance of the line to neutral will be
(a) 9.7 pF/m
(b) 10.2 pF/m
(c) 8.7 uF/km
(d) 2.4 uF/m
Ans: a
49. For a 500 Hz frequency excitation, a 50 km long power line will be modelled as
(a) short line
(b) medium line
(c) long line
(d) data isufficient decision
Ans: c
50. Bundled conductors are employed to
(a) reduce the short circuit current
(b) improve system stability
(c) decreases system stability
(d) increase the short circuit current
Ans: c
Read More Questions:
Power Systems MCQs Part1
Power Systems MCQs Part2
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