If the supply frequency to the transformer is increased,”the iron loss will__________?

Related Mcqs:

1. In an actual transformer the iron loss remains practically constant from no load to full load because:____________?

   A. value of transformation ratio remains constant
   B. permeability of transformer core remains constant
   C. core flux remains practically constant
   D. primary voltage remains constant
   C. secondary voltage remains constant

2. Iron loss of a transformer can be measured by____________?

   A. low power factor wattmeter
   B. unity power factor wattmeter
   C. frequency meter
   D. any type of wattmeter

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 core used in high frequency transformer is usually___________?

   A. copper core
   B. cost iron core
   C. air core
   D. mild steel core

6. When a given transformer is run at its rated voltage but reduced frequency, its____________?

   A. flux density remains unaffected
   B. iron losses are reduced
   C. core flux density is reduced
   D. core flux density is increased

7. The purpose of providing an iron core in a transformer is to_____________?

   A. provide support to windings
   B. reduce hysteresis loss
   C. decrease the reluctance of the magnetic path
   D. reduce eddy current losses

8. The purpose of providing iron core in a step-up transformer is?

   A. to provide coupling between primary and secondary
   B. to increase the magnitude of mutual flux
   C. to decrease the magnitude of mag-netizing current
   D. to provide all above features

9. When secondary of a current transformer is open-circuited its iron core will be__________?

   A. hot because of heavy iron losses taking place in it due to high flux density
   B. hot because primary will carry heavy current
   C. cool as there is no secondary current
   D. none of above will happen

10. Hysteresis loss in a transformer varies as CBmax = maximum flux density) ?

    A. Bmax
    B. Bmax1-6
    C. Bmax1-83
    D. B max