1. The insulating material for a cable should have ______.
2. Which of the following protects a cable against mechanical injury ?
3. Which of the following insulation is used in cables ?
4. Empire tape is _______.
5. The thickness of the layer of insulation on the conductor, in cables, depends upon
6. The bedding on a cable consists of _______.
7. The insulating material for cables should _______.
8. In a cable immediately above metallic sheath _____ is provided.
9. The current carrying capacity of cables in D.C. is more than that in A.C. mainly due to
10. In case of three core flexible cable the colour of the neutral is ______.
11 Cables are used for 132 kV lines.
12. Conduit pipes are normally used to protect _____ cables.
13. The minimum dielectric stress in a cable is at _____.
14. In single core cables armouring is not done to ________.
15. Dielectric strength of rubber is around
16. Low tension cables are generally used upto _______.
17. In a cable, the maximum stress under operating conditions is at
18. High tension cables are generally used upto
19. The surge resistance of cable is _______.
20. PVC stands for _______.
21. In the cables, the location of fault is usually found out by comparing
22. In capacitance grading of cables we use a ______ dielectric.
23. Pressure cables are generally not used beyond
24. The material for armouring on cable is usually
25. Cables, generally used beyond 66 kV are _______.
26. The relative permittivity of rubber is ______.
27. Solid type cables are considered unreliable beyond 66 kV because
28. If the length of a cable is doubled, its capacitance
29. In cables the charging current ______.
30. A certain cable has an insulation of relative permittivity 4. If the insulation is replaced by one of relative permittivity 2, the capacitance of the cable will become
31. If a cable of homogeneous insulation has a maximum stress of 10 kV/mm, then the dielectric strength of insulation should be
32. In the cables, sheaths are used to ______.
33. The intersheaths in the cables are used to _______.
34. The electrostatic stress in underground cables is ______.
35. The breakdown of insulation of the cable can be avoided economically by the use of
36. The insulation of the cable decreases with
37. A cable carrying alternating current has
38. In a cable the voltage stress is maximum at
39. Capacitance grading of cable implies
40. Underground cables are laid at sufficient depth
41. The advantage of cables over overhead transmission lines is
42. The thickness of metallic shielding on cables is usually
43. Cables for 220 kV lines are invariably
44. Is a cable is to be designed for use on 1000 kV, which insulation would you prefer ?
45. If a power cable and a communication cable are to run parallel the minimum distance between the two, to avoid interference, should be
46. Copper as conductor for cables is used as
47. The insulating material should have
48. The advantage of oil filled cables is ______.
49. The disadvantage with paper as insulating material is
50. The breakdown voltage of a cable depends on
51. It is difficult to maintain oil filled cables.
51. In capacitance grading a homogeneous dielectric is used.
52. In congested areas where excavation is expensive and inconvenient 'draw in system' of laying of underground cablesis often adopted.
53. Natural rubber is obtained from milky sap of tropical trees.
54. Rubber is most commonly used insulation in cables.
55. Polyethylene has very poor dielectric and aging properties.
56. The metallic sheath may be made of lead or lead alloy or of aluminum.
2. Which of the following protects a cable against mechanical injury ?
3. Which of the following insulation is used in cables ?
4. Empire tape is _______.
5. The thickness of the layer of insulation on the conductor, in cables, depends upon
6. The bedding on a cable consists of _______.
7. The insulating material for cables should _______.
8. In a cable immediately above metallic sheath _____ is provided.
9. The current carrying capacity of cables in D.C. is more than that in A.C. mainly due to
10. In case of three core flexible cable the colour of the neutral is ______.
11 Cables are used for 132 kV lines.
12. Conduit pipes are normally used to protect _____ cables.
13. The minimum dielectric stress in a cable is at _____.
14. In single core cables armouring is not done to ________.
15. Dielectric strength of rubber is around
16. Low tension cables are generally used upto _______.
17. In a cable, the maximum stress under operating conditions is at
18. High tension cables are generally used upto
19. The surge resistance of cable is _______.
20. PVC stands for _______.
21. In the cables, the location of fault is usually found out by comparing
22. In capacitance grading of cables we use a ______ dielectric.
23. Pressure cables are generally not used beyond
24. The material for armouring on cable is usually
25. Cables, generally used beyond 66 kV are _______.
26. The relative permittivity of rubber is ______.
27. Solid type cables are considered unreliable beyond 66 kV because
28. If the length of a cable is doubled, its capacitance
29. In cables the charging current ______.
30. A certain cable has an insulation of relative permittivity 4. If the insulation is replaced by one of relative permittivity 2, the capacitance of the cable will become
31. If a cable of homogeneous insulation has a maximum stress of 10 kV/mm, then the dielectric strength of insulation should be
32. In the cables, sheaths are used to ______.
33. The intersheaths in the cables are used to _______.
34. The electrostatic stress in underground cables is ______.
35. The breakdown of insulation of the cable can be avoided economically by the use of
36. The insulation of the cable decreases with
37. A cable carrying alternating current has
38. In a cable the voltage stress is maximum at
39. Capacitance grading of cable implies
40. Underground cables are laid at sufficient depth
41. The advantage of cables over overhead transmission lines is
42. The thickness of metallic shielding on cables is usually
43. Cables for 220 kV lines are invariably
44. Is a cable is to be designed for use on 1000 kV, which insulation would you prefer ?
45. If a power cable and a communication cable are to run parallel the minimum distance between the two, to avoid interference, should be
46. Copper as conductor for cables is used as
47. The insulating material should have
48. The advantage of oil filled cables is ______.
49. The disadvantage with paper as insulating material is
50. The breakdown voltage of a cable depends on
51. It is difficult to maintain oil filled cables.
51. In capacitance grading a homogeneous dielectric is used.
52. In congested areas where excavation is expensive and inconvenient 'draw in system' of laying of underground cablesis often adopted.
53. Natural rubber is obtained from milky sap of tropical trees.
54. Rubber is most commonly used insulation in cables.
55. Polyethylene has very poor dielectric and aging properties.
56. The metallic sheath may be made of lead or lead alloy or of aluminum.
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