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Transformer cores are normally made from

A. Soft ferrites

B. High purity iron

C. Grain oriented Fe-Si alloy

D. Al-Ni-Co alloy

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  1. __________ cannot increase the fatigue strength of a material.
  2. Which of the following is the most suitable abrasive for grinding high tensile strength materials?
  3. Heating the Hypo-eutectoid steels to 30°C above the upper critical temperature line, soaking at…
  4. The unit of gc is
  5. Silicon percentage in the silicon steel used for electrical appliances/equipments is
  6. Which of the following is an example of cathodic protection of metals against corrosion?
  7. Maximum amount of thermal radiation is emitted at all wavelengths at any specified temperature by a/an…
  8. All of the following alloying elements of steel increases hardness but sacrifice ductility, except
  9. Matte smelting is used in the extraction of
  10. Gratings is associated with the measurement of
  11. Gas turbine normally employs a constant __________ cycle.
  12. During decarburising of a plain carbon steel, the thickness of ferrite layer growth is proportional…
  13. __________ is the hardest material out of the following.
  14. Silicon percentage in acid resistant cast iron is about
  15. Pick out the wrong conversion of absolute & kinematic viscosities.
  16. For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other…
  17. Electrometallurgy is not involved in the extraction of __________ from its ore.
  18. Exposure to __________ accelerates the degradation of plastics.
  19. Latent heat of dry steam at atmospheric pressure is 539 Kcal/kg; which __________ with increase in the…
  20. Which of the following is an acidic constituent of B.F. slag?
  21. Which of the following does not discharge the dust collected as a dry solid?
  22. The only suitable method for hardening the low carbon steel is case hardening. Which of the following…
  23. The stress at which extension of the material takes place more rapidly as compared to the increase in…
  24. Temperature attained in soldering of metals is about __________ °C.
  25. Which of the following hardness tests does not measure the indentation hardness of metals and alloys?
  26. A spring material should have low
  27. Brazing is the joining of metals
  28. Upto the critical radius of insulation, added insulation, will
  29. __________ is the hardest oxide and is hence used where high wear resistance at high temperature is…
  30. Diamagnetic materials