Fire refining process is employed in case of___________________?

Related Mcqs:

1. Which of the following metals is not subjected to electrolytic refining/purification ?

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

2. Current employed in resistance welding ranges from ____________________ kVA/cm2?

   A. 1.2 to 2.5
   B. 4.5 to 6.2
   C. 7.5 to 8.5
   D. 10.5 to 15.5

3. Catalyst used in the catalytic converter employed in automobiles to convert CO into CO2 and for complete oxidation of un-burnt hydrocarbons is___________________?

   A. Nickel
   B. Cobalt
   C. Vanadium
   D. Platinum

4. Which of the following mainly decides the current to be employed is arc welding ?

   A. Electrode size
   B. Plate thickness
   C. Voltage across the arc
   D. Welded portion length

5. A fire tube boiler is limited to a maximum steam pressure of about ______________ kg/cm2 ?

   A. 6
   B. 18
   C. 38
   D. 52

6. Large scale fire on fuel gas line is normally extinguished by________________?

   A. Water
   B. Steam
   C. Foam
   D. Nitrogen

7. _______________ is not a case hardening process ?

   A. Carburising
   B. Nitriding
   C. Cyaniding
   D. Annealing

8. The refractory lining of the bottom in a basic electric arc furnace is made of___________________?

   A. Silica
   B. Alumina
   C. Magnesia
   D. Fireclay

9. Absolute zero pressure can be attained at a temperature of___________________?

   A. 0°C
   B. 50°K
   C. 0°R
   D. None of these

10. Fog is an example of colloidal system of___________________?

    A. Solid dispersed in gas
    B. Solid dispersed in liquid
    C. Liquid dispersed in gas
    D. Gas dispersed in liquid