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EEE :: Electric Transmission and Distribution

  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

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

  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

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

  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

  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

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

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

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

  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