QUIZ - 4



  1. Dielectric oil used in transformer is
      2. Vegetable oil
      Refined Mineral oil
      Synthetic oil
      None of the above


  2. Oil used in transformer for-
      3. Cooling
      Dielectric
      Lubricating
      Both for cooling and dielectric


  3. The flash temperature of dielectric oil used in transformer
      4. 1400 C
      2000 C
      3000 C
      300 C


  4. The dielectric strength of transformer oil is-
      5. 25 kV/mm.
      50 kV/mm.
      12 kV/mm.
      10 kV/mm.


  5. The color of good transformer oil is-
      6. Dark Black
      Transparent Yellow
      Dark Blue
      None of the above


  6. When oil decomposed it liberates-
      7. Carbon
      Hydrogen
      Carbon and Hydrogen
      None


  7. Dielectric strengths of Air at NTP is
      8. 50 kV/mm
      25 kV/mm
      12 kV/mm
      3 kV/mm


  8. The Break Down Voltage (BDV) of transformer oil is measured when-
      9. One point flash occurs
      Two point flash occurs
      Multi point flash occurs
      None of the above


  9. The most commonly used unit of dielectric strength is -
      10. kV/mm.
      V/cm.
      MV/mm.
      kV/m.


  10. The maximum pour point temperature of dielectric oil is-
      11. -60 C
      100 C
      10 C
      500 C