The transformer lamination’s are insulated from each other by____________?

Related Mcqs:

1. The degree of mechanical vibrations produced by the laminations of a transformer depends on____________?

   A. tightness of clamping
   B. gauge of laminations
   C. size of laminations
   D. all of the above

2. The thickness of laminations used in a transformer is usually____________?

   A. 0.4 mm to 0.5 mm
   B. 4 mm to 5 mm
   C. 14 mm to 15 mm
   D. 25 mm to 40 mm

3. The noise resulting from vibrations of laminations set by magnetic forces, is termed as_________________?

   A. magnetostrication
   B. boo
   C. hum
   D. zoom

4. 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

5. 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

6. 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

7. The path of a magnetic flux in a transformer should have______________?

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

8. 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

9. The hum in a transformer is mainly attributed to______________?

   A. load changes
   B. oil in the transformer
   C. magnetostriction
   D. mechanical vibrations

10. A good voltage regulation of a transformer means________________?

    A good voltage regulation of a transformer means
    A. output voltage fluctuation from no load to full load is least
    B. output voltage fluctuation with power factor is least
    C. difference between primary and secondary voltage is least
    D. difference between primary and secondary voltage is maximum