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Drossing is a __________ operation.

A. Smelting

B. Dressing

C. Roasting

D. Dressing

Correct Answer : C.


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  1. The most suitable material for die casting is
  2. The main constituent of bones is
  3. An atom bomb works on the principle of
  4. Diffusion co-efficient of a metal in a solid solution depends upon its
  5. Steam condenser tubes are made of admiralty brass, in which percentage of zinc & copper are __________…
  6. Force between the molecules of the same substance is called __________ force.
  7. Midrex process of sponge iron production uses reformed natural gas as the reducing agent, which uses…
  8. Working of linear variable differential transducer (LVDT) is based on the principle of variable
  9. Which of the following is not an ore of copper?
  10. Addition of __________ to steel does not impart hardness.
  11. Filler material used in welding should have __________ as compared to the parent metal to be welded.
  12. Pick out the wrong statement.
  13. The friction factor for the turbulent fluid flow in a rough pipe does not depend upon the
  14. Shrinkage allowance on pattern is provided to compensate for shrinkage when the
  15. Factor of safety in machine design is defined as the ratio of ultimate stress to __________ stress.
  16. Cascade control is
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  18. During sensible cooling of air, its wet bulb temperature
  19. Identify the correct statement.
  20. Evaporative cooling process employs a combination of cooling and humidification in which the
  21. Blasting of tri-nitro-toluene (TNT) is done by mixing it with ammonium
  22. Unit of surface tension in S.I. unit is
  23. __________ cannot increase the fatigue strength of a material.
  24. Hardening of steel is not possible, unless it is heated __________ critical point.
  25. Normalising of an object does not
  26. Oxyacetylene reducing flame is used while carrying out welding on
  27. Wrought iron does not have
  28. Triple point of water is
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  30. __________ of austenite decreases the hardenability in steel.