The most important requirement for aluminium industry is the availability of cheap _______________?

Related Mcqs:

1. Titanium is added to molten aluminium alloys before casting for the purpose of_____________________?

   A. Grain refinement
   B. Increasing corrosion resistance
   C. Reducing porosity
   D. Improving fluidity

2. Aluminium is extracted from____________________?

   A. Chalcocite
   B. Bauxite
   C. Galena
   D. None of these

3. Hot extrusion of aluminium is done in the temperature range of ________________ °C ?

   A. 550-600
   B. 450-500
   C. 350-400
   D. 250-300

4. 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

5. _____________ is the process of coating the surface of steel with aluminium oxide, thereby imparting it increased resistance to corrosion & oxidation upto a temperature of 700°C ?

   A. Veneering
   B. Galvanising
   C. Electroplating
   D. Calorising

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. _______________ is the most important element, which controls the physical properties of steel ?

   A. Manganese
   B. Silicon
   C. Carbon
   D. Vanadium

8. Capacity & power requirement for an air compressor working at high altitude compared to sea-level will be_______________?

   A. More
   B. Less
   C. Same
   D. Either more or less; depends on the climatic conditions

9. Production of one ton of paper in Indian paper industry consumes about ____________ kWh of electricity ?

   A. 300
   B. 800
   C. 1400
   D. 2000

10. ‘Flare tower’ used in industry is meant for_____________________?

    A. Venting off (after burning) the excess inflammable/toxic gases at high pressure
    B. Absorbing the pollutant gases from the furnace exhaust
    C. Cooling of furnace exhaust gases
    D. None of these