Transmission and distribution Archives

61. Which of the following D.C. distribution system is the simplest and lowest in first cost?

Radial system

Ring system

distribution system is the simplest and lowest in first cost? A. Radial system B. Ring system C. Interconnected system

None of the above

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62. Which of the following faults is most likely to occur in cables?

Cross or short-circuit fault

Open circuit fault

Breakdown of cable insulation

All of the above

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63. The operating voltage of extra high tension cables is upto

6.6 kV

11 kV

33 kV

66 kV

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64. The usual spans with R.C.C. poles are

40-50 meters

60-100 meters

poles are A. 40-50 meters B. 60-100 meters C. 80-100 meters

300-500 meters

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65. Skin effect is proportional to

$${left( {{ ext{conductor diameter}}} ight)^{rac{1}{2}}}$$

(conductor diameter)4

(conductor diameter)2

(conductor diameter)3 E. none of the above

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66. The presence of ozone due to corona is harmful because it

Reduces power factor

Corrodes the material

Gives odour

Transfer energy to the ground

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67. High voltage transmission lines use

Suspension insulators

Pin insulators

Both (A) and (B)

None of the above

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68. The wooden poles well impregnated with creosote oil or any preservative compound has life

From 2 to 5 years

10 to 15 years

25 to 30 years

60 to 70 years

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