Transmission and distribution

31. The material commonly used for sheaths of underground cables is

Lead
Rubber
Copper
Iron

Detailed SolutionThe material commonly used for sheaths of underground cables is

32. By which of the following systems electric power may be transmitted?

Overhead system
Underground system
Both (A) and (B)
None of the above

Detailed SolutionBy which of the following systems electric power may be transmitted?

33. The wooden poles well impregnated with creosite oil or any preservative compound have life

from 2 to 5 years
10 to 15 years
25 to 30 years
60 to 70 years

Detailed SolutionThe wooden poles well impregnated with creosite oil or any preservative compound have life

34. For transmission of power over a distance of 200 km, the transmission voltage should be

132 kV
66 kV
33 kV
11 kV

Detailed SolutionFor transmission of power over a distance of 200 km, the transmission voltage should be

35. Which of the following distribution systems is more reliable?

Radial system
Tree system
Ring main system
All are equally reliable

Detailed SolutionWhich of the following distribution systems is more reliable?

36. The conductors of the overhead lines are

solid
stranded
both solid and stranded
none of the above

Detailed SolutionThe conductors of the overhead lines are

37. In a tap changing transformer, the tappings are provided on

Primary winding
Secondary winding
High voltage winding
Any of the above

Detailed SolutionIn a tap changing transformer, the tappings are provided on

38. A conductor, due to sag between two supports, takes the form of

Semicircle
Triangle
Ellipse
Catenary

Detailed SolutionA conductor, due to sag between two supports, takes the form of

39. Which of the following regulations is considered best?

50%
20%
10%
2%

Detailed SolutionWhich of the following regulations is considered best?

40. Which of the following is the source of heat generation in the cables?

Dielectric losses in cable insulation
losses in the conductor
Losses in the metallic sheathings and armourings
All of the above

Detailed SolutionWhich of the following is the source of heat generation in the cables?

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