31. If in a short transmission line, resistance and inductance are found to be equal and regulation appear. to be zero, then the load will
(a) have unity power factor
(b) have zero power factor
(c) be 0.707 lagging
(d) be 0.707 lagging
Ans: c
32. "Expanded ACSR" are conductors composed of
(a) larger diameter individual strands for a given cross-section of the aluminium strangs
(b) larger diameter of a central steel strands for a given overall diameter of the conductor
(c) larger diamter of the aluminium strands only for a given overall diameter of the conductor
(d) a fillter between the inner steel and the outer aluminium strands to increase the overall diameter of the conductor
Ans: d
33. What is the sag for a span of 400m, if the ultimate tensile strength of conductor is 6000 kgf, and the weight of conductor is 550 kgf/km? Factor of safety is 2.
(a) 1.016 m
(b) 2.40 m
(c) 3.6 m
(d) 4.2 m
Ans: c
34. A transmission line haB a span of 275 m between level supporte. The conductor has a diameter of 19.58 mm, weight 0.844 kgpm and has an ultimate breaking strength of 7950 kgf. Each conductor has a radial covering of ice 9.58 mm thick and is subjected to a horizontal wind pressure of 40 k617m2 of ice covering projected area. If the factor of safety is 2, what is the deflected sag? Ice weight is 913.5 kg/m3
(a) 5.36
(b) 4.1 m
(c) 3.9 m
(d) 3.01 m
Ans: a
35. A transmission line conductor having a diameter of 19.5 mm, weight 850 kglkm. The span is 275 m. The wind pressure is 39 kg/m of projected area with ice coating of 13 mm. The ultimate strength of the conductor is'8000 kg. What is the maximum sag, if the factor of safety is 2 and ice weight 910 kg/m3?
(a) 4.5 m
(b) 6.4 m
(c) 7.0 m
(d) 5 m
Ans: b
36. A transmission line conductor at a river crossing is supported from two towers at height. of 30 m and 90m, above water level. The horizontal distance between the towers is 270m, if the tension in the conductor is 1800 kg and the conductor weight 1 kg/m. What is the clearance between the conductor and the water at a point midway between the towers?
(a) 79.50 m
(b) 54.94 m
(c) 60 m
(d) 51.4 m
Ans: b
37. An overhead transmission line has a span of 240m between level supports. What is the maximum sag if the conductor weight 727 kg/km and has a breaking strength of 6880 kg? Allow the factor of safety of 2. Neglecting wind and ice loading.
(a) 1.52 m
(b) 1.6 m
(c) 0.75 m
(d) 1.25 m
Ans: a
38. The line conductor of a transmission line has an overall diameter of 19.53 mm, weight 0.844 kg/m and an ultimate breaking strength of 7950 kg. If the factor of safety is to be 2, when conductor has an ice of 1 kg/m and a horizontal wind pressure of 1.5 kg/m. What is the vertical sag, corresponding to this loading for a 300 m span level supports?
(a) 1.08 m
(b) 5.0 m
(c) 5.22 m
(d) 4.62 m
Ans: c
39. A two conductor 1 - pi line operates at 50 Hz. The diameter of each conductor is 20 mm and the spacing between conductors is 3m. What is the inductance of each conductor per km?
(a) 1.19 kH/km
(b) 1.24 mH/km
(c) 2.38 mH/km
(d) 0.59 mH/km
Ans: a
40. A two conductor 1 - pi line operates at 50 Hz. The diameter of each conductor is 20mm and the spacing between conductor is 3m. When the conductor material is steel of relative permeability 50, the loop inductance per km of the line will be
(a) 8.2 mHlkm
(b) 7.281 mHlkm
(c) 5.0 mHlkm
(d) 2 mHlkm
Ans: b
Read More Questions:
Power Systems MCQs Part1
Power Systems MCQs Part2
(a) have unity power factor
(b) have zero power factor
(c) be 0.707 lagging
(d) be 0.707 lagging
Ans: c
32. "Expanded ACSR" are conductors composed of
(a) larger diameter individual strands for a given cross-section of the aluminium strangs
(b) larger diameter of a central steel strands for a given overall diameter of the conductor
(c) larger diamter of the aluminium strands only for a given overall diameter of the conductor
(d) a fillter between the inner steel and the outer aluminium strands to increase the overall diameter of the conductor
Ans: d
33. What is the sag for a span of 400m, if the ultimate tensile strength of conductor is 6000 kgf, and the weight of conductor is 550 kgf/km? Factor of safety is 2.
(a) 1.016 m
(b) 2.40 m
(c) 3.6 m
(d) 4.2 m
Ans: c
34. A transmission line haB a span of 275 m between level supporte. The conductor has a diameter of 19.58 mm, weight 0.844 kgpm and has an ultimate breaking strength of 7950 kgf. Each conductor has a radial covering of ice 9.58 mm thick and is subjected to a horizontal wind pressure of 40 k617m2 of ice covering projected area. If the factor of safety is 2, what is the deflected sag? Ice weight is 913.5 kg/m3
(a) 5.36
(b) 4.1 m
(c) 3.9 m
(d) 3.01 m
Ans: a
35. A transmission line conductor having a diameter of 19.5 mm, weight 850 kglkm. The span is 275 m. The wind pressure is 39 kg/m of projected area with ice coating of 13 mm. The ultimate strength of the conductor is'8000 kg. What is the maximum sag, if the factor of safety is 2 and ice weight 910 kg/m3?
(a) 4.5 m
(b) 6.4 m
(c) 7.0 m
(d) 5 m
Ans: b
36. A transmission line conductor at a river crossing is supported from two towers at height. of 30 m and 90m, above water level. The horizontal distance between the towers is 270m, if the tension in the conductor is 1800 kg and the conductor weight 1 kg/m. What is the clearance between the conductor and the water at a point midway between the towers?
(a) 79.50 m
(b) 54.94 m
(c) 60 m
(d) 51.4 m
Ans: b
37. An overhead transmission line has a span of 240m between level supports. What is the maximum sag if the conductor weight 727 kg/km and has a breaking strength of 6880 kg? Allow the factor of safety of 2. Neglecting wind and ice loading.
(a) 1.52 m
(b) 1.6 m
(c) 0.75 m
(d) 1.25 m
Ans: a
38. The line conductor of a transmission line has an overall diameter of 19.53 mm, weight 0.844 kg/m and an ultimate breaking strength of 7950 kg. If the factor of safety is to be 2, when conductor has an ice of 1 kg/m and a horizontal wind pressure of 1.5 kg/m. What is the vertical sag, corresponding to this loading for a 300 m span level supports?
(a) 1.08 m
(b) 5.0 m
(c) 5.22 m
(d) 4.62 m
Ans: c
39. A two conductor 1 - pi line operates at 50 Hz. The diameter of each conductor is 20 mm and the spacing between conductors is 3m. What is the inductance of each conductor per km?
(a) 1.19 kH/km
(b) 1.24 mH/km
(c) 2.38 mH/km
(d) 0.59 mH/km
Ans: a
40. A two conductor 1 - pi line operates at 50 Hz. The diameter of each conductor is 20mm and the spacing between conductor is 3m. When the conductor material is steel of relative permeability 50, the loop inductance per km of the line will be
(a) 8.2 mHlkm
(b) 7.281 mHlkm
(c) 5.0 mHlkm
(d) 2 mHlkm
Ans: b
Read More Questions:
Power Systems MCQs Part1
Power Systems MCQs Part2
No comments:
Post a Comment