Description : The operation of removal of impurities or clay adhering to iron ores, is known as (A) Dressing (B) Calcination (C) Roasting (D) Smelti
Last Answer : Answer: Option A
Description : Calcination of iron ores is done (A) To remove moisture (B) To remove carbonic acid (C) By roasting in heaps (D) All the above
Last Answer : Answer: Option D
Description : Heating of a ore below its melting point in the absence of air is known as – (1) Refining (2) Calcination (3) Roasting (4) Smelting
Last Answer : (2) Calcination Explanation: Calcination involves simple decomposition of ore on heating below its melting point usually in absence of air to produce new compounds having higher percentage of ... as removing the moisture, organic matter and volatile impurities. Calcination makes the ore porous.
Description : Sulphur removal by heating of pyrite ore in presence of air is called its (A) Reduction (B) Roasting (C) Calcination (D) Smelting
Last Answer : (B) Roasting
Description : Heating of a ore below its melting point in the absence of air is known as (1) Refining (2) Calcination (3) Roasting (4) Smelting
Last Answer : Calcination
Description : Concentration of sulphide ores is done usually by (A) Roasting (B) Smelting (C) Froth floatation (D) Electromagnetic separation
Last Answer : (C) Froth floatation
Description : Drossing is a __________ operation. (A) Smelting (B) Dressing (C) Roasting (D) Dressing
Last Answer : (C) Roasting
Description : Which of the following is an ore dressing operation? (A) Classification (B) Smelting (C) Roasting (D) None of these
Last Answer : Option A
Description : Pig iron made from haematite ores free from sulphur, phosphorus and copper, is known as (A) Bessemer pig (B) Grey or foundry pig (C) White or forge pig (D) Mottled pig
Description : Wrought iron is manufactured from pig iron by (A) Refining (B) Pudding (C) Shingling (D) All the above
Description : Pick up the correct statement from the following: (A) Blisters in the finished wrought iron, are caused due to the reaction between oxide of iron and carbon (B) The edges of a finished wrought iron ... shortage (C) Pig iron (charcoal) is manufactured from magnetic ore (Fe3O4) (D) All the above
Description : Cast iron (A) Is obtained by purifying pig iron (B) Is manufactured in required shapes (C) May contain 2 to 5 per cent of carbon with other impurities (D) All the above
Description : Difference between Calcination and Roasting.
Last Answer : Calcination Roasting 1)Process of heating the ore strongly in absence of air below its M.P 1)Process of heating the ore strongly in presence of air below its M.P. 2)This ... the doors are kept opened. 6. Decomposition reaction takes place 6.Oxidation reaction takes place
Description : In extraction of metal how many of the following ores calcination process is involved . (i) Dolomite (ii) Malachite (iii) Calcite (iv) Copper pyrities
Last Answer : In extraction of metal how many of the following ores calcination process is involved . (i) Dolomite ... Siderite (viii) Iron pyrite (ix) Ar gentite
Description : To which of the following ores , calcination process is not applicable
Last Answer : To which of the following ores , calcination process is not applicable A. Zns B. `Al_(2)O_(3)2H_(2)O` C. `CuCO_(3).Cu(OH)_(2)` D. `CaCO_(3)`
Description : The use of heat treatment of ore that includes smelting and roasting is termed as - (1) Electrometallurgy (2) Hydrometallurgy (3) Pyrometallurgy (4) Cryometallurgy
Last Answer : (3) Pyrometallurgy Explanation: Pyrometallurgy consists of the thermal treatment of minerals and metallurgical ores and concentrates to bring about physical and chemical transformations in the materials to enable ... in a blast furnace in order to fuse the desired metals into impure molten bullion.
Description : The metallurgical process in which a metal is obtained in a fused state is called - (1) roasting (2) calcinations (3) smelting (4) froth floatation
Last Answer : (3) smelting Explanation: The metallurgical process in which a metal is obtained in a fused state is called smelting.
Description : The use of Heat treatment of ore that includes smelting and roasting is termed as–
Last Answer : Pyrometallurgy
Description : Shaft furnaces are used for (A) Smelting (B) Calcining (C) Roasting (D) All (A), (B) and (C)
Last Answer : Corporate Strategy
Description : 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
Last Answer : (B) Coal based thermal power plants
Description : Copper is refined commercially by a process of: w) smelting x) electrolysis y) sublimation z) roasting
Last Answer : ANSWER: X -- ELECTROLYSIS
Description : The use of heat treatment of ore that includes smelting and roasting is termed as : (1) Electrometallurgy (2) Hydrometallurgy (3) Pyrometallurgy (4) Cryometallurgy
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
Last Answer : Which of the following faction is of no significance for roasting sulphide ores to the oxide and ... are thermodynamically more stable than `CS_(2)`
Description : Reverberatory furnace is used for (A) Roasting/reduction of ores (B) Annealing steel coil (C) Heating air (D) Steel melting
Last Answer : (A) Roasting/reduction of ores
Description : Unreacted core model' represents the reaction involving (A) Combustion of coal particles (B) Roasting of sulphide ores (C) Manufacture of carbon disulphide from elements (D) None of these
Last Answer : (B) Roasting of sulphide ores
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
Description : How do you make a pig roasting spit?
Last Answer : Fill his mouth with soda and tell him a funny joke!!
Description : If the iron ore contains clay as an impurity, the flux added during calcination, is (A) Clay (B) Lime stone (C) Argillaceous iron ore (D) All the above
Last Answer : Answer: Option B
Description : During smelting process, the combination of fuel in the furnace (A) Forms carbon dioxide (B) Carbon dioxide with carbon forms carbon mono-oxide (C) Carbon mono-oxide reacts with Fe2O3 to form iron and liberates CO2 (D) All the above
Description : Pick up the correct statement from the following: (A) Roasting is not necessary if iron ore is an oxide (B) Impurities float on the molten iron as slag (C) The slag contains lime about 45% (D) All the above
Description : 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
Description : Which one of the following reactions occur during smelting in the reduction zone at lower temperature(in iron metallurgy)?
Last Answer : Which one of the following reactions occur during smelting in the reduction zone at lower temperature(in iron ... CO` D. `CO_(2)+C rarr 2CO`
Description : Which of the following statements are true with respect to iron ore? 2. Limestone and coal are important for smelting iron ore 3. More than 20% of the world iron ore deposits are in India 4. Odisha and Jharkhand top in the ... a) I, II and III (b) II and III (c) III and IV (d) II, III and IV
Last Answer : Ans: (a)
Description : Which of the following minerals are required for smelting iron ore? (1) Limestone and gypsum (2) Manganese and limestone (3) Limestone and coal (4) Gypsum and coal
Last Answer : (2) Manganese and limestone Explanation: Composite volcanoes are most commonly found in island arcs. Most of them are found scattered on the islands adjoining the Pacific Ring of Fire where ... region of high volcanic and seismic activity that surrounds the majority of the Pacific Ocean Basin.
Last Answer : Manganese and limestone
Description : Pick up the correct statement from the following: (A) The heating of a material to redness in contact with air, is known as calcination (B) The property of lime by which it sets or hardens in ... (C) The product that remains after calcination of limestone, is called lime (D) All the above
Description : Quick lime (or caustic lime) (A) Is obtained by the calcination of pure lime stone (B) Has great affinity to moisture (C) Is amorphous (D) All the above
Description : Hydraulic lime is obtained by (A) Burning of lime stone (B) Burning of kankar (C) Adding water to quick lime (D) Calcination of pure clay
Description : Pig iron obtained from the furnace which is properly provided with fuel at a very high temperature, is called (A) Bessemer pig (B) Grey or foundry pig (C) White or forge pig (D) Mottled pig
Description : For light and ornamental casting, the most unsuitable pig iron, is (A) Bessemer pig (B) Grey or foundry pig (C) White or forge pig (D) Mottled pig
Description : Forge pig may be converted to wrought iron by (A) Rolling (B) Pudding (C) Shingling (D) Refining
Description : Bessemer process is used for the manufacture of (A) Pig iron (B) Cast iron (C) Wrought iron D) Steel
Description : The variety of pig iron used for the manufacture of steel by Bessemer process, is (A) Bessemer pig (B) Grey pig (C) White forge pig (D) Mottled pig
Description : If the furnace is provided with insufficient fuel at low temperatures, the type of pig iron produced, is called (A) Bessemer pig (B) Grey or foundry pig (C) White or forge pig (D) Mottled pig
Last Answer : Answer: Option C
Description : The variety of pig iron used for manufacture of wrought iron, is (A) Bessemer pig (B) Grey or foundry pig (C) White forge pig (D) Mottled pig
Description : The process of decarbonising the pig iron completely and then adding proper percentage of carbon for manufacturing steel, is called (A) Cementation process (B) Crucible process (C) Bessemer process (D) Open hearth process
Description : Pick up the correct statement from the following: (A) In basic Bessemer process, the steel heats the converter (B) In open-hearth process, the furnace heats the steel (C) In Siemens process, the impurities of pig iron are oxidised by the oxygen of the ore (D) All the above
Description : Portland cement manufactured from pure white chalk and clay but free from iron-oxide, is known as (A) Quick setting cement (B) Rapid hardening cement (C) White cement (D) Low heat Portland cement
Description : Iron ore hematite is concentrated using (A) Electromagnetic separation mainly (B) Gravity separation (C) Froth floatation (D) Roasting
Last Answer : (B) Gravity separation
Description : 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)
Last Answer : Ans: (b)