11. The power factor of a power transformer on no load will be about
- unity
- 0.75
- 0.5
- 0.35
12. The flux in transformer core
- increases with load
- decreases with load
- remains constant irrespective of load
- none of the above
13. The primary ampere turns are counter balanced by
- secondary ampere turns
- primary flux
- increase in mutual flux
- increase in secondary current
14. Which of the following is not a part of transformer installation?
- Conservator
- Breather
- Buchholz relay
- Exciter
15. What is the working principle of a Transformer?
- Principle of Self induction
- Principle of mutual induction
- Principle of magnetic locking
- Principle of ampere law
16. Transformer ratings are generally expressed in ________
- kVA
- kW
- kVAR
- HP
17. Transformers windings are generally made of _________
- Steel iron alloy
- Alloy
- Steel
- Copper
18. What is the function of a breather in a transformer?
- To cool the transformer oil
- To prevent the flow of moisture when outside air enters the transformer
- To provide moisture to the transformer
- To cool the coils during reduced load
19. Which of the following winding has more number of turns in a transformer?
- Primary winding
- Secondary winding
- Low voltage winding
- High voltage winding
20. Which of the following loss in a transformer is zero even at full load?
- Core loss
- Copper loss
- Friction loss
- Hysteresis loss