Overhead line MCQ

51. Which is usually not the generating voltage?

  1. 6.6 kV
  2. 8.8 kV
  3. 11 kV
  4. 13.2 kV

52. For overhead line, the surge impedance is taken as

  1. 20-30 ohms
  2. 70—80 ohms
  3. 100—200 ohms
  4. 500—1000 ohms

53. A presence of ozone due to corona is harmful, why?

  1. reduces power factor
  2. corrodes the material
  3. gives odor
  4. transfer energy to the ground

54. feeder, in a transmission system, feeds power to___

  1. distributors
  2. generating stations
  3. service mains
  4. all of the above

55. The power transmitted will be maximum when

  1. corona losses are minimum
  2. reactance is high
  3. sending end voltage is more
  4. receiving end voltage is more

56. A 3-phase four-wire system is commonly used on

  1. primary transmission
  2. secondary transmission
  3. primary distribution
  4. secondary distribution

57. Which material is used for overhead transmission lines?

  1. Steel coredaluminium
  2. Galvanized steel
  3. Cadmium copper
  4. Any of the above

58. Which is not a component for making porcelain insulators?

  1. Quartz
  2. Kaolin
  3. Felspar
  4. Silica

59. There is a higher possibility of occurrence of the corona during___

  1. dry weather
  2. winter
  3. summer heat
  4. humid weather

60. Which is used on long transmission lines?

  1. Impedance relay
  2. Mho’s relay
  3. Reactance relay
  4. None of the above
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