Transmission and distribution

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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proportional to" class="read-more button" href="https://exam.pscnotes.com/mcq/skin-effect-is-proportional-to/#more-47086">Detailed SolutionSkin effect is proportional to

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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d="M549.7 124.1c-6.3-23.7-24.8-42.3-48.3-48.6C458.8 64 288 64 288 64S117.2 64 74.6 75.5c-23.5 6.3-42 24.9-48.3 48.6-11.4 42.9-11.4 132.3-11.4 132.3s0 89.4 11.4 132.3c6.3 23.7 24.8 41.5 48.3 47.8C117.2 448 288 448 288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z"/> Subscribe on YouTube is harmful because it" class="read-more button" href="https://exam.pscnotes.com/mcq/the-presence-of-ozone-due-to-corona-is-harmful-because-it/#more-46933">Detailed SolutionThe presence of ozone due to corona is harmful because it

67. High voltage transmission lines use

Suspension insulators
Pin insulators
Both (A) and (B)
None of the above

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use" class="read-more button" href="https://exam.pscnotes.com/mcq/high-voltage-transmission-lines-use/#more-46880">Detailed SolutionHigh voltage transmission lines use

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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132.3s0 89.4 11.4 132.3c6.3 23.7 24.8 41.5 48.3 47.8C117.2 448 288 448 288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z"/> Subscribe on YouTube href="https://exam.pscnotes.com/mcq/the-wooden-poles-well-impregnated-with-creosote-oil-or-any-preservative-compound-has-life/#more-46665">Detailed SolutionThe wooden poles well impregnated with creosote oil or any preservative compound has life

69. The material commonly used for insulation in high voltage cables is

Lead
Paper
Rubber
None of the above

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6.3-42 24.9-48.3 48.6-11.4 42.9-11.4 132.3-11.4 132.3s0 89.4 11.4 132.3c6.3 23.7 24.8 41.5 48.3 47.8C117.2 448 288 448 288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z"/> Subscribe on YouTube is" class="read-more button" href="https://exam.pscnotes.com/mcq/the-material-commonly-used-for-insulation-in-high-voltage-cables-is/#more-46556">Detailed SolutionThe material commonly used for insulation in high voltage cables is

70. The material generally used for armour of high voltage cables is

Aluminium
Steel
Brass
Copper

Detailed

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SolutionThe material generally used for armour of high voltage cables is

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