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Matte smelting is used in the extraction of

A. Lead

B. Zinc

C. Aluminium

D. Copper

Please do not use chat terms. Example: avoid using "grt" instead of "great".

You can do it
  1. Strain hardening effect in a metal subjected to cold working is due to the __________ mechanism.
  2. One face of a furnace wall is at 1030°C and the other face is exposed to room temperature (30°C).…
  3. Pick out the wrong statement.
  4. The amount of water evaporated in kg per kg of fuel burnt in a boiler is called the __________ of a…
  5. Ultimate strength in tension as compared to that in shear for steel is
  6. The heat treatment to which the steel wire containing > 0.25% carbon is subjected to is
  7. Pick out the wrong statement.
  8. Nitriding of a steel part does not increase its
  9. Tesla metre per ampere (T. m/A) is the unit for the measurement of
  10. Adhesives
  11. Basic open hearth furnace (BOF) is not used for producing __________ steel.
  12. Which of the following alloying elements is present in maximum percentage in high speed steel?
  13. Production of one ton of paper in Indian paper industry consumes about __________ kWh of electricity.
  14. __________ has a negative co-efficient of linear expansion.
  15. __________ cannot increase the fatigue strength of a material.
  16. Maximum hardenability of steel depends upon its
  17. Probability of cavitation occuring becomes very high, when the local __________ resulting in water bubbles…
  18. Volumetric composition of flue gas analysed with the Orsat apparatus is : CO2 = 12%, O2 = 8%, CO = nil,…
  19. Melting point & boiling points of liquid oxygen are respectively - 218.8°C & - 183°C, while…
  20. Circular cross section machine parts which are symmetrical about the axis of rotation are made by hot
  21. Material of construction of the electrode used in the electric resistance welding is
  22. A solution which resists change in its pH value on addition of acid/alkali is called the __________…
  23. Pearlite comprises of
  24. Hollow shafts can be made as strong as solid shafts by making the twisting moments of both the shafts…
  25. In chemical dehumidification process
  26. Increase in temperature, in general results in the
  27. Air/fuel ratio by weight for combustion of methane with theoretical quantity of air will be about
  28. The refrigerant freon-12 is chemically
  29. Gratings is associated with the measurement of
  30. Diamagnetic materials