Powder metallurgy process does not make metal powder by_________________________?

Related Mcqs:

1. Powder metallurgy technique is used in the production of ____________________ tools ?

   A. Tungsten carbide
   B. High carbon steel
   C. High speed steel
   D. Drilling

2. Carbide tipped cutting tools are manufactured by powder metallurgy techniques and have a composition of_____________________?

   A. 90% tungsten carbide and 10% cobalt
   B. 70% aluminium oxide & 30% silica
   C. 30% nickel, 15% chromium & 55% tungsten
   D. 65% tungsten & 35% zirconium

3. For preparation of porous bearings by powder metallurgy, preferred particle shape is___________________?

   A. Spherical
   B. Nodular
   C. Irregular
   D. No preferred shape

4. Powder metallurgy is used to produce__________________?

   A. High precision components with complex cavities and sharp features
   B. Components of large size
   C. Porosity free components
   D. Components of such alloys whose constituents do not form alloys readily

5. Which of the following can be manufactured using powder metallurgy techniques ?

   A. Brake linings
   B. Bearings
   C. Carbide tool tips
   D. All A, B and C

6. Identify the correct statement with reference to the extractive metallurgy of aluminium ?

   A. The electrolyte consists of molten Na3AlF6 with approximately 1 to 8% Al2O3
   B. Approximately 80% of the aluminium deposited on the cathode comes from cryolite
   C. Sodium is deposited along with aluminium, but is immediately vaporised
   D. Anode effect sets in when the cryolite concentration goes below 40%.

7. Alloy powder manufactured by the following process have spherical shapes ?

   A. Electrochemical deposition
   B. Gaseous reduction
   C. Atomisation
   D. Mechanical attrition

8. Solidification time of a molten metal in a casting is proportional to (where, V = volume of metal & A = its surface area; in the casting) ?

   A. V/A
   B. V/A2
   C. V2/A
   D. V2/A2

9. Hot dipping process is used for coating a low melting point metal (e.g. Pb, Sn, Zn) on iron, steel & copper having relatively higher melting points. Which of the following is not a hot dipping process ?

   A. Galvanising
   B. Tinning
   C. Sherardizing
   D. None of these

10. Property responsible for the talcum powder to cling to the skin is the__________________?

    A. Capillary action
    B. Adhesion
    C. Cohesion
    D. Surface tension