In a power or distribution transformer about 10 per cent end turns are heavily insulated__________?

Related Mcqs:

1. The no-load current drawn by transformer is usually what per cent of the full-load current ?

   A. 0.2 to 0.5 per cent
   B. 2 to 5 per cent
   C. 12 to 15 per cent
   D. 20 to 30 per cent

2. Which winding in a transformer has more number of turns ?

   A. Low voltage winding
   B. High voltage winding
   C. Primary winding
   D. Secondary winding

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. 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?

   A. Conservator
   B. Breather
   C. Bushings
   D. Buchholz relay

5. The maximum efficiency of a distribution transformer is____________?

   A. at no load
   B. at 50% full load
   C. at 80% full load
   D. at full load

6. Efficiency of a power transformer is of the order of________________?

   A. 100 per cent
   B. 98 per cent
   C. 50 per cent
   D. 25 per cent

7. 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

8. The power transformer is a constant______________?

   A. voltage device
   B. current device
   C. power device
   D. main flux device

9. The maximum load that a power transformer can carry is limited by its________________?

   A. temperature rise
   B. dielectric strength of oil
   C. voltage ratio
   D. copper loss

10. No-load on a transformer is carried out to determine______________?

    A. copper loss
    B. magnetising current
    C. magnetising current and loss
    D. efficiency of the transformer