For the metallurgical process of which of the ores calcined ore can be reduced by carbon?

For the metallurgical process of which of the ores calcined ore can be reduced by carbon?
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For the metallurgical process of which of the ores calcined ore can be reduced by carbon? A. haematite B. Calamine C. Iron pyrites D. Sphalerite
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Roasting of metallurgical ores is done mainly to (A) Dehydrate it (B) Sinter the ore (C) Remove CO2 & H2O (D) Remove arsenic & sulphur

Description : Roasting of metallurgical ores is done mainly to (A) Dehydrate it (B) Sinter the ore (C) Remove CO2 & H2O (D) Remove arsenic & sulphur

Last Answer : (D) Remove arsenic & sulphur

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Electrolytic reduction cell used for conversion of calcined Al2O3to Al is a carbon lined furnace operating at 800-900 °C. The purpose of electric current supplied to the furnace is to (A) Achieve very high purity of aluminium (99.9%) (B) Keep the electrolyte in liquid condition by the generation of heat (C) Electrolytically dissociate alumina (D) Both (B) & (C)

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Assertion : Froth flatation process is used to concentrate sulphide ores. Reason : There is a difference in the nature of wettibility of different ore

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The commodity which accounts for the maximum volume of goods transported by the railways in India is (a) iron and steel (b) coal (c) mineral oil (d) metallic ores (other than iron ore)

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At a site, low grade copper ores are available and zinc and iron seraps are also available. Which of the two seraps will be more suitable for reducing the leached copper ore and why ?

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If the ore impurities is (A) Clay, lime stone is used as flux (B) Lime stone, clay is used as flux (C) Quartz, lime stone and argillaceous iron ores are used as flux (D) All the above

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Which of the following metallurgical process does not involve heating?

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Last Answer : (3) smelting Explanation: The metallurgical process in which a metal is obtained in a fused state is called smelting.

The metallurgical process in which a metal is obtained in a fused state is called?

Description : The metallurgical process in which a metal is obtained in a fused state is called?

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Which of the following faction is of no significance for roasting sulphide ores to the oxide and not subjecting the sulphide ores in carbon reduction

Description : Which of the following faction is of no significance for roasting sulphide ores to the oxide and not subjecting the sulphide ores in carbon reduction

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In extraction of metal how many of the following ores calcination process is involved . (i) Dolomite (ii) Malachite (iii) Calcite (iv) Copper pyrities

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To which of the following ores , calcination process is not applicable

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Description : Generally sulphide ores are concentrated by following process

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The process of extraction of metals from their ores; and then refining them for use is known as?

Description : The process of extraction of metals from their ores; and then refining them for use is known as?

Last Answer : metallurgy

The process of purifying Sulphide ores?

Description : The process of purifying Sulphide ores?

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The study of metals and the overall process by which metals are extracted from its ores are called?

Description : The study of metals and the overall process by which metals are extracted from its ores are called?

Last Answer : Metallurgy

Which of the following is the primary reason for adding calcium carbonate to the reduction process of iron oxide ores ? The calcium carbonate: w) acts as an oxidizing agent x) removes silicate waste products y) acts as a reducing agent z) removes sulfur waste products

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When an inert atmosphere is required in metallurgical operation nitrogen is commonly used. However in the extraction of titanium from `TiCl_(4)` using

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When an inert atmosphere is required in metallurgical operation nitrogen is commonly used. However in the extraction of titanium from `TiCl_(4)` using

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The National Metallurgical Laboratory of India is at (a) Jamshedpur (b) Dhanbad (c) Roorkee (d) Ranchi

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LSHS is a type of furnace oil, which (A) Is more viscous than high viscosity furnace oil (HVFO) (B) Stands for low sulphur heavy stock (C) Is an ideal fuel for metallurgical furnaces due to its lower sulphur content (< 1%(D) All (A), (B) and (C))

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Last Answer : (D) All (A), (B) and (C)

Electronic structure of a material is generally studied by (A) Metallurgical microscope (B) Electron diffraction (C) Spectroscopic techniques (D) X-ray

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__________ is used for examining the macro-structure of a material. (A) Metallurgical microscope (B) Optical microscope (C) X-rays (D) Visual inspection by naked eye

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Bacillus thuringiensis (Bt) strains have been used for designing novel (a) biofertilizers (b) bio-metallurgical techniques (c) bio-mineralization processes (d) bioinsecticidal plants.

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The nodal department for wind detection IMD refers to a) Indian meteorological department b) Indian metrological department c) Indian metallurgical department d) None of these

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Higher percentage of ash in coal meant for the production of metallurgical grade coke (A) Decreases the hardness of coke (B) Decreases the abrasion resistance of coke (C) Causes brittleness in steel (D) None of these

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Quantity of coke produced from metallurgical coal may be around __________ percent. (A) 30 (B) 50 (C) 75 (D) 95

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Volatile matter content of metallurgical coke may be around __________ percent. (A) 1-2 (B) 10-15 (C) 22-26 (D) 30-33

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Shatter index of metallurgical coke on 2 inches and 0.5 inch screen should be respectively around __________ percent. (A) 80 and 97 (B) 95 and 100 (C) 40 and 70 (D) 25 and 97

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Last Answer : (A) 80 and 97

Presence of phosphorous in metallurgical coal (A) Is not undesirable (B) Reduces its calorific value (C) Badly affects the quality of steel

Description : Presence of phosphorous in metallurgical coal (A) Is not undesirable (B) Reduces its calorific value (C) Badly affects the quality of steel

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Low temperature carbonisation of coal produces (A) Metallurgical coke (B) Soft coke (C) Very low calorific value coke oven gas (D) No by-products

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A good metallurgical coke should have very low (A) Sulphur & phosphorous content (B) Porosity (C) Fusion point of its ash (D) Hardness & strength

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Last Answer : (A) Sulphur & phosphorous content

Which of the following coke has the least percentage of ash? (A) Petroleum coke (B) Beehive coke (C) Foundry coke (D) Metallurgical coke

Description : Which of the following coke has the least percentage of ash? (A) Petroleum coke (B) Beehive coke (C) Foundry coke (D) Metallurgical coke

Last Answer : (A) Petroleum coke

Desirable "Micum Index" values of metallurgical coke are (A) M40 > 78% and M10 < 10% (B) M40 > 4% and M10 < 80% (C) M40 > 10% and M10 < 78% (D) M40 > 98% and M10 < 2%

Description : Desirable "Micum Index" values of metallurgical coke are (A) M40 > 78% and M10 < 10% (B) M40 > 4% and M10 < 80% (C) M40 > 10% and M10 < 78% (D) M40 > 98% and M10 < 2%

Last Answer : (A) M40 > 78% and M10 < 10%

A good metallurgical coke (A) Should have high porosity (B) Should be brittle (C) Must contain moderate quantities of ash, moisture, sulphur and volatile matters (D) Should have low fusion point of its ash

Description : A good metallurgical coke (A) Should have high porosity (B) Should be brittle (C) Must contain moderate quantities of ash, moisture, sulphur and volatile matters (D) Should have low fusion point of its ash

Last Answer : (A) Should have high porosity

Caking index of the coal blend used for the manufacture of metallurgical coke should be around (A) 5 (B) 21 (C) 40 (D) 48

Description : Caking index of the coal blend used for the manufacture of metallurgical coke should be around (A) 5 (B) 21 (C) 40 (D) 48

Last Answer : (B) 21

Sulphur in metallurgical coal (A) Contributes to its heating value (B) Affects the quality of steel produced as cracks develop on the surface while rolling the steel (C) Both (A) and (B) (D) Neither (A) nor (B)

Description : Sulphur in metallurgical coal (A) Contributes to its heating value (B) Affects the quality of steel produced as cracks develop on the surface while rolling the steel (C) Both (A) and (B) (D) Neither (A) nor (B)

Last Answer : (C) Both (A) and (B)

Combustion of pulverised fuel (A) Requires larger combustion chamber than rich gaseous fuel (B) In a metallurgical furnace does not contaminate the product in the furnace by ash from fuel (C) Suppresses the discharge of fine dust and grit into atmosphere (D) All (A), (B) and (C)

Description : Combustion of pulverised fuel (A) Requires larger combustion chamber than rich gaseous fuel (B) In a metallurgical furnace does not contaminate the product in the furnace by ash from fuel (C) Suppresses the discharge of fine dust and grit into atmosphere (D) All (A), (B) and (C)

Last Answer : (A) Requires larger combustion chamber than rich gaseous fuel

Which of the following is the common pollutant emitted from metallurgical smelters, thermal power plant and cement plants? (A) NOx (B) Hg (C) SO2 (D) F

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Last Answer : (C) SO2

The main industrial source of emission of hydrogen sulphide air pollutant is (A) Petroleum refineries (B) Coal based thermal power plants (C) Pulp and paper plant (D) Metallurgical roasting & smelting plant

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Last Answer : (B) Coal based thermal power plants

In a Rankine cycle, with the maximum steam temperature being fixed from metallurgical considerations, as the boiler pressure increases (a) The condenser load will increase [IES-1997] (b) The quality of turbine exhaust will decrease (c) The quality of turbine exhaust will increase (d) The quality of turbine exhaust will remain unchanged

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Last Answer : (b) The quality of turbine exhaust will decrease 

Burning pyrites ore gives out – (1) Carbon dioxide gas (2) Sulphur dioxide gas (3) Nitrogen dioxide gas (4) Nitric oxide gas

Description : Burning pyrites ore gives out – (1) Carbon dioxide gas (2) Sulphur dioxide gas (3) Nitrogen dioxide gas (4) Nitric oxide gas

Last Answer : (2) Sulphur dioxide gas Explanation: The mineral pyrite, or iron pyrite, is an iron sulfide with the formula FeS9. Pyrite remains in commercial use for the production of sulfur dioxide, for use in such applications as the paper industry, and in the manufacture of sulfuric acid.