In a transformer the tappings are generally provided on_____________?

Related Mcqs:

1. 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

2. 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

3. A transformer core is laminated to__________?

   A. reduce hysteresis loss
   B. reduce eddy current losses
   C. reduce copper losses
   D. reduce all above losses

4. In the transformer following winding has got more cross-sectional area______________?

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

5. 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

6. The power transformer is a constant______________?

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

7. 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

8. Delta/star transformer works satisfactorily when______________?

   A. load is balanced only
   B. load is unbalanced only
   C. on balanced as well as unbalanced loads
   D. none of the above

9. The path of the magnetic flux in transformer should have____________?

   A. high reluctance
   B. low reactance
   C. high resistance
   D. low resistance

10. Which of the following loss in a transformer is zero even at full load ____________?

    A. Core loss
    B. Friction loss
    C. Eddy current loss
    D. Hysteresis loss