The product (s) of roasting of a sulphide ore is (are)

A. Oxide only

B. Sulphate only

C. Oxide and sulphate

D. Dependent on temperature and partial pressure of oxygen & sulphur dioxide

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  1. Annealing of cast iron
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  3. Alumina, silica, lime and iron oxide are the basic raw material for the manufacture of Portland cement.…
  4. __________ of grey cast iron produces white cast iron.
  5. The elastic strain energy of a unit length of an edge dislocation as compared to that of a screw dislocation…
  6. Which of the following are considered applications of ultrasonic testing?
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  10. Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity)
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  13. High speed steel tools retain their hardness upto a temperature of __________ °C.
  14. Notched bar test is used for testing the __________ of a material.
  15. The minimum carbon content in steel should be __________ percent for it to respond to a hardening treatment.
  16. Which of the following is the largest quantum of pressure?
  17. __________ glass is used in the mercury in glass thermometer meant for measuring a temperature of 500°C.
  18. Which of the following is an example of cathodic protection of metals against corrosion?
  19. The usual energy consumption in electric arc furnace steel making is __________ KWh/ton of steel.
  20. If a nuclear reactor produces more fissile nuclear fuel than it consumes, then it is called a __________…
  21. In the blast furnace, incorporation of water vapour in the blast gives the following effect.
  22. Recrystallisation temperature of steel is __________ °C.
  23. At 100% relative humidity, the dew point temperature of moist air is
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  26. __________ is a special constituent of chlorophyll without which photosynthesis is not possible.
  27. Spheroidising of a material is a/an __________ process.
  28. Tumbling is the process of improving the __________ of the materials/parts.
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