Related Questions

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
Which of the following metals can be extracted from its ore by both pyrometallur-gical as well as hydrometallurgical methods ?
A Copper
B Zinc
C Both A & B
D Neither A nor B
By which of the following processes are metals of high reactivity extracted from purified molten ore?
A Reduction by an appropriate reducing agent
B Roasting
C Electrolysis
D Calcination
The product (s) of roasting of a sulphide ore is (are)
A Oxide only
B Sulphate only
C Oxide and sulphate
D Dependent on temperature and partial pressure of oxygen & sulphur dioxide
Frother is added in the froth floatation cell used in ore beneficiation to stabilise the air bubbles (i.e., froth), which will hold the ore particles, but it does not affect the floatability of minerals. Which of the following is not used as a frother?
A Cresylic acid
B Xanthaies
C Pine oil
D All of the above
The method of concentrating the ore which makes use of the difference in density between ore and impurities is called
A liquation
B leaching
C levigation
D magnetic separation
Ore concentration by froth floatation utilises the __________ of ore particles.
A Density difference
B Wetting characteristics
C Terminal velocities
D None of these
Leaching of uranium ore and gold ore is done in
A Centrifugal extractor
B Pachuka tanks
C Bollman extractor
D None of these
What type of fusion welding process is used for welding sheet metals of all engineering metals (except Cu, Ag) in automobile and air craft industries, pipe and tubing production?
A Thermit welding
B Electroslag welding
C Resistance welding
D Submerged arc Welding
Which one of the following resists hydrogen sulphide corrosion?
A R.C.C.
B Glazed stone wares
C Asbestos cement
D Glazed ware

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