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Fire refining process is employed in case of

A. Tin

B. Copper

C. Zinc

D. Aluminium

Correct Answer : B.


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  1. Surface tension of a liquid
  2. Function of fusible plug in a boiler is to
  3. Which of the following metals is the most prone to work hardening?
  4. Venturimeter is used to measure the flow rate of fluids in pipes, when the pipe is in __________ position.
  5. Recrystallisation temperature of steel is __________ °C.
  6. The specific gravity of coal depends mainly on its __________ content.
  7. Otto cycle used in spark ignition petrol engines is also known as the constant __________ cycle.
  8. Spheroidising of a material is a/an __________ process.
  9. Ultimate strength in tension as compared to that in shear for steel is
  10. __________ wire is never used for making the heating element.
  11. Pick out the wrong statement.
  12. Maximum hardenability of steel depends upon its
  13. Density in the solid state is slightly less than that in its liquid state, in case of
  14. The materials which fracture even at small strains are termed as brittle, while those materials which…
  15. Increase in the entropy of a system represents the
  16. The two elements required to form substitutional solid solution should not have
  17. Particle nature of cathode rays is proved due to the fact that they
  18. What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer…
  19. Titanium is produced by __________ of Ti Cl4.
  20. What is the percentage of chromium in 18-4-1 high speed steel?
  21. Wavelength of radiation emitted by a body depends on the __________ of its surface.
  22. __________ can replace tungsten in high speed steel.
  23. __________ of grey cast iron produces white cast iron.
  24. In extrusion of metals, which of the following statement is true?
  25. Joule-Thomson co-efficient is the ratio of
  26. In case of compression of one kg of air, the work done will be the least, when the value of polytropic…
  27. Dielectric
  28. A compact estimate about the amount of materials handling between various work stations is obtained…
  29. Chromium molybdenum steel cannot be welded using __________ welding.
  30. The minimum carbon content in steel should be __________ percent for it to respond to a hardening treatment.