Power System - I (3140914) MCQs

MCQs of Underground Cables

Showing 41 to 50 out of 112 Questions
2 3 4 5 6 7
41.
The insulation used in cable designed for  use on 1000 kV is usually
(a) Impregnated paper
(b) Compressed SF6
(c) PVC
(d) Any of above
Answer:

Option (b)

42.
Sulphur hexafluoride cable is insulated by
(a) Impregnated paper
(b) Polyvinyl chloride
(c) High pressure oil
(d) Compressed gas
Answer:

Option (d)

43.
In compressed gas insulated cable SF6 has the gas pressure in the range of
(a) 10 to 20 mm-Hg
(b) 80 to 100 mm-Hg
(c) 3 to 5 kg/cm2
(d) 40 to 50 kg/cm2
Answer:

Option (c)

44.
VIR cables are usually used for
(a) Internal wiring of buildings
(b) 6.6 kV
(c) 11 kV
(d) 33 kV
Answer:

Option (a)

45.
Cables used in automobiles and arc welding sets are usually
(a) Paper insulated
(b) VIR
(c) High pressure gas insulated
(d) Oil filled
Answer:

Option (b)

46.
At Bridge crossings and near the railway track ternary lead cables are used because they
(a) Are of high tensile strength
(b) Are of low coefficient of thermal expansion
(c) Are of low specific gravity
(d) Can withstands shocks and vibration
Answer:

Option (c)

47.
Internal pressure cables has the advantage of
(a) Elimination of external accessories
(b) Suitability for vertical run without any fear of  drainage with suitable design
(c) Marked improvement in the power factor of cable dielectric with the increased pressure
(d) All of above
Answer:

Option (d)

48.
Insulation resistance of the cable decreases with the
(a) Increase in length of cable
(b) Decrease  in length of cable
(c) Electric stresses
(d) None of above
Answer:

Option (a)

49.
With the rise in temperature, the insulation resistivity
(a) Remains unchanged
(b) Decrease linearly
(c) Increases linearly
(d) Reduces exponentially
Answer:

Option (d)

50.
The insulation resistance of a cable length 10 km is 1 MΩ. For a length of 100 km of the same cable, the insulation resistance will be
(a) 1 MΩ
(b) 10 MΩ
(c) 0.1 MΩ
(d) 0.01 MΩ
Answer:

Option (c)

Showing 41 to 50 out of 112 Questions
2 3 4 5 6 7