The changes in volume of transformer cooling oil due to variation of atmospheric temperature during day and night is taken care of by which part of transformer?

Related Mcqs:

1. Gas is usually not liberated due to dissociation of transformer oil unless the oil temperature exceeds?

   A. 50°C
   B. 80°C
   C. 100°C
   D. 150°C

2. A common method of cooling a power transformer is_______________?

   A. natural air cooling
   B. air blast cooling
   C. oil cooling
   D. any of the above

3. Which of the following is the main advantage of an auto-transformer over a two winding transformer?

   A. Hysteresis losses are reduced
   B. Saving in winding material
   C. Copper losses are negligible
   D. Eddy losses are totally eliminated

4. Natural oil cooling is used for transformers up to a rating of____________?

   A. 3000 kVA
   B. 1000 kVA
   C. 500 kVA
   D. 250 kVA

5. The dielectric strength of transformer oil is expected to be______________?

   A. lkV
   B. 33 kV
   C. 100 kV
   D. 330 kV

6. A transformer oil must be free from________________?

   A. sludge
   B. odour
   C. gases
   D. moisture

7. The transformer oil should have _______ volatility and _______ viscosity?

   A. low,low
   B. high,high
   C. low,high
   D. high,low

8. In a given transformer for given applied voltage, losses which remain constant irrespective of load changes are______________?

   A. friction and windage losses
   B. copper losses
   C. hysteresis and eddy current losses
   D. none of the above

9. In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are__________?

   A. hysteresis and eddy current losses
   B. friction and windage losses
   C. copper losses
   D. none of the above

10. If a transformer is continuously operated the maximum temperature rise will occur in_______________?

    A. core
    B. windings
    C. tank
    D. any of the above