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