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  1. The inductance of a single phase two wire line is given by (D is the distance between conductors and 2v is the diameter of conductor)
  2. A.
    0.4 loge (D/r) mH/km
    B.
    0.55 loge (D/r) mH/km
    C.
    0.4 loge (r/D) mH/km
    D.
    0.55 loge (r/D) mH/km

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  3. Between two supports, due to sag the conductor takes the form of
  4. A.
    catenary
    B.
    triangle
    C.
    ellipse
    D.
    semi-circle

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  5. Presence of ozone as a result of corona is harmful because
  6. A.
    it gives bad odor
    B.
    it corrodes the material
    C.
    it transfers energy to the ground
    D.
    reduces power factor

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  7. The current drawn by the line due to corona losses is
  8. A.
    sinusoidal
    B.
    square
    C.
    non-sinusoidal

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  9. Corona effect can be detected by
  10. A.
    hissing sound
    B.
    faint luminous flow of bluish color
    C.
    presence of ozone detected by odor
    D.
    all of the above

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  11. Corona usually occurs when the electrostatic stress in the air around the conductor succeeds
  12. A.
    30 kV (maximum value)/cm
    B.
    22 kV (maximum value)/cm
    C.
    11 kV (rms value)/cm
    D.
    6.6 kv (rms value)/cm

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  13. The effect of corona is
  14. A.
    increased energy loss
    B.
    increased reactance
    C.
    increased inductance
    D.
    all of the above

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  15. Ten discs usually suggest that the transmission line voltage is
  16. A.
    11 kV
    B.
    33 kV
    C.
    66 kV
    D.
    132 kV

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  17. For 66 kV lines the number of insulator discs used are
  18. A.
    3
    B.
    5
    C.
    8
    D.
    12

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  19. Strain type insulator arc used where the conductors arc
  20. A.
    dead ended
    B.
    at intermediate anchor towers
    C.
    any of the above
    D.
    none of the above

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