In “Imperial Smelting Process” for extraction of zinc, zinc vapour thus produced is quenched in the external condenser by the use of the following _______________________?

Related Mcqs:

1. Matte smelting is used in the extraction of_____________________?

   A. Lead
   B. Zinc
   C. Aluminium
   D. Copper

2. A solid aluminium ball, when quenched in a water bath maintained at 40°C, cools down from 550°C to 450°C in 20 seconds. The expected temperature of the ball after next 20 seconds may be about ____________________ °C?

   A. 370
   B. 340
   C. 320
   D. 300

3. Steam condenser tubes are made of admiralty brass, in which percentage of zinc & copper are _______________ respectively ?

   A. 70 & 30
   B. 30 & 70
   C. 50 & 50
   D. 90 & 10

4. Which of the following is an undesirable property of slag produced during the Pyrometallurgical method of metal extraction from its ore ?

   A. High fusibility & fluidity
   B. High thermal conductivity
   C. Low density
   D. High chemical activity

5. Which of the following commonly used condenser tube materials has the lowest thermal conductivity ?

   A. Admiralty brass
   B. Stainless steel
   C. Aluminium brass
   D. Titanium

6. Removal of non-condensable from steam or other vapour is termed as the ________________ process?

   A. Condensation
   B. Deaeration
   C. Scavenging
   D. Exhaust

7. Brass parts with high residual tensile stress at the surface are susceptible to season cracking (i.e. spontaneous cracking occuring on exposure to atmospheric corrosion), if its zinc percentage is more than ?

   A. 5
   B. 10
   C. 20
   D. 35

8. Coating thickness in case of galvanising of steel sheet generally corresponds to the deposition of _______________ gms of zinc per m2 of steel strip ?

   A. 5-10
   B. 1000-1500
   C. 120-500
   D. 1500-3000

9. The function of neutral flux used in the pyrometallurgy of metal extraction is to increase the _____________ of the slag ?

   A. Fluidity
   B. Basicity
   C. Acidity
   D. Viscosity

10. Electrometallurgical methods of metal extraction is normally used for those metals___________________?

    A. Whose oxide/ore is not reduced by carbon
    B. Which fall in the category of alkali & alkaline earth metals
    C. Which stands higher in the electrochemical series of the metal
    D. All A, B. & C.