Description : Reducing atmosphere is maintained in a (A) Calcination kiln (B) Blast furnace (C) Soaking pit (D) L.D. converter
Last Answer : (B) Blast furnace
Description : Conversion of yellow phosphorus to red phosphorous is done in retorts at 250-450°C in the (A) Presence of an inert atmosphere (B) Presence of a reducing atmosphere (C) Absence of air (D) Presence of an oxidising atmosphere
Last Answer : (C) Absence of air
Description : Pick out the wrong statement. (A) Pulverised fuel can be completely burnt with less percentage of excess air compared to lump coal (B) Low grade coal can be used, but generally high volatile ... and atmosphere (oxidising or reducing) is easily possible with pulverised fuel firing (D) None of these
Last Answer : (D) None of these
Description : Pick out the wrong statement. (A) Addition of methane to the furnace atmosphere reduces decarburising by hydrogen (B) Nitrogen in presence of steam decor-burises high carbon steel, whereas hydrocarbon ... the metal surface) cause nitride formation with increase in surface hardness (D) None of these
Description : The purpose of controlling the furnace atmosphere is to prevent surface attack by (A) Oxidation/scaling (B) Decarburising (C) Sulphur penetration (D) Either of the above
Last Answer : (D) Either of the above
Description : Which is the main reducing agent during production of iron from iron ore in a blast furnace? (A) C (B) CO (C) CO2 (D) H2
Last Answer : (B) CO
Description : The main reducing agent in iron blast furnace is(A) Carbon dioxide (B) Carbon monoxide (C) Oxygen (D) Air
Last Answer : Option B
Description : In the extraction of iron in the blast furnace, the reducing agent for the ore is
Last Answer : In the extraction of iron in the blast furnace, the reducing agent for the ore is A. Carbon monoxide B. Carbon dioxide C. Carbon D. Silica
Description : Neutral atmosphere is maintained in a/an __________ furnace. (A) Cold rolled steel coil annealing (B) Open hearth (C) Soaking pit (D) Walking beam reheating
Last Answer : (A) Cold rolled steel coil annealing
Description : In order to maintain an oxidising atmosphere in a furnace, it should have (A) More of excess air (B) Less of excess air (C) More of CO in flue gas (D) More of CO2 in flue gas
Last Answer : (A) More of excess air
Description : In the blast furnace, incorporation of water vapour in the blast gives the following effect. (A) Increases the reducing potential of the gas (B) Increases the flame temperature (C) No significant change occurs (D) Increases the hydrogen content in the metal
Last Answer : (A) Increases the reducing potential of the gas
Description : The impure iron (pig iron) that is tapped out from blast furnace contains about __________ percent carbon. (A) 0.2 (B) 2 (C) 4 (D) 8
Last Answer : (C) 4
Description : Yield of blast furnace gas is about __________ Nm3 /ton of pig iron. (A) 300 (B) 2000 (C) 5000 (D) 10000
Last Answer : (B) 2000
Description : __________ is used as a flux in the extraction of iron from iron ore (haematite) in blast furnace. (A) Bauxite (B) Limestone (C) Quartz (D) Manganese
Last Answer : (B) Limestone
Description : Specific gravity of hot metal (pig iron) is __________ times that of the blast furnace slag. (A) 2 (B) 3 (C) 0.8 (D) 6
Last Answer : (B) 3
Description : Volume of blast furnace slag is about __________ times the volume of hot metal (pig iron) of the same weight (A) 1.5 (B) 3 (C) 5
Description : Dephosphorization of molten pig iron is favoured by (A) Oxidising and basic slag (B) Reducing and basic slag (C) High activity co-efficient of phosphorous in metal (D) Oxidising and neutral slag
Description : Bleaching action of bleaching powder is due to its __________ properties. (A) Reducing (B) Oxidising (C) Disinfecting (D) None of these
Last Answer : (B) Oxidising
Description : __________ Nature of hypo (sodium thiosulphate) makes it useful in photography. (A) Oxidising (B) Reducing (C) Complex forming (D) Photochemical
Last Answer : (C) Complex forming
Description : Assertion: Wrough iron is prepared from cast iron by oxidising impurities in a reverberatory furnace lined with haematite. Reason: Haematite oxidises
Last Answer : Assertion: Wrough iron is prepared from cast iron by oxidising impurities in a reverberatory furnace lined ... -1 is false but Statement -2 is true
Description : Magnetic permeability of iron is increased by its (A) Decarburising (B) Alloying with cobalt (C) Purification (D) Alternate heating & cooling
Description : Test specimen for determination of refractoriness under load (RUL) of a refractory is heated in a (A) Furnace employing neutral atmosphere (B) Carbon resistance furnace (C) Reducing atmosphere (D) Furnace employing negative pressure
Last Answer : (B) Carbon resistance furnace
Description : In order to maintain a reducing atmosphere in a furnace, it should have (A) No O2 in flue gas (B) CO in flue gas (C) High excess air (D) None of these
Last Answer : (B) CO in flue gas
Description : Petroleum coke is used mainly in the (A) Discoloration of yellow glycerine (B) Sugar refining (C) Manufacture of carbon electrode (D) Blast furnace for reduction of iron ore
Last Answer : (C) Manufacture of carbon electrode
Description : Raw materials are charged in the iron blast furnace using (A) Bucket elevator (B) Skip hoist (C) Screw conveyor (D) None of these
Last Answer : (B) Skip hoist
Description : Main use of hard coke produced by high temperature carbonisation is in the (A) Iron blast furnace (B) Cupola in foundries (C) Sinter making (D) Domestic ovens
Last Answer : (A) Iron blast furnace
Description : The main charge in blast furnace is usually (A) Iron ore & coke (B) Iron ore, coke & air (C) Limestone, coke & iron ore (D) Limestone, sand & iron ore
Last Answer : Limestone, coke & iron ore
Description : Which of the following contributes maximum as main source of sulphur in the blast furnace charge? (A) Sinter (B) Coke (C) Iron ore (D) Limestone
Last Answer : Coke
Description : Limestone is added in the blast furnace (during pig iron manufacture) to (A) Form slag by combining with impurities (B) Supply heat by undergoing exothermic reaction with impurities (C) Reduce the coke consumption (D) Reduce slag viscosity
Last Answer : Option A
Description : Pick out the wrong statement. (A) Cold cracking of a weld is due to the presence of hydrogen gas in the weld (B) True stress is given by, σ = σE (1 + εE), where σE and εE ... in the iron blast furnace (D) High residual stress at the surface is beneficial for fatigue properties of a material
Last Answer : Option C
Description : Thermal efficiency of blast furnace stoves used for heating blast (air) may be about __________ percent. (A) 20 (B) 40 (C) 60 (D) 80
Last Answer : (D) 80
Description : Operation of blast furnace stove is based on the principles of a __________ furnace. (A) Regenerative (B) Recuperative (C) Both (A) and (B) (D) Neither (A) nor (B)
Last Answer : (A) Regenerative
Description : Size of blast furnace grade coke is __________ mm. (A) 25-80 (B) 0-15 (C) 15-25 (D) > 100
Last Answer : (A) 25-80
Description : Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is __________ percent. (A) < 37% (B) > 71% (C) In between 37 & 71% (D) None of these
Last Answer : (C) In between 37 & 71%
Description : Dust content in raw blast furnace gas is about __________ gm/Nm3 ; hence it is cleaned to the dust level of about < 10 mg /Nm3 before use. (A) 15-30 (B) 1-2 (C) 70-100 (D) 150-200
Last Answer : (A) 15-30
Description : Abrasion index of blast furnace coke should be around __________ percent. (A) 20 (B) 35 (C) 55 (D) 80
Description : Main use of soft coke is as __________ fuel. (A) Domestic (B) Blast furnace (C) Foundry (D) None of these
Last Answer : (A) Domestic
Description : Blast furnace gas is a very poisonous gas because of its predominantly high __________ content. (A) H2O (B) CO2 (C) CO (D) CH4
Last Answer : (C) CO
Description : Calorific value of blast furnace gas is around __________ KCal/Nm3 . (A) 850 (B) 1800 (C) 4200 (D) 6500
Last Answer : (A) 850
Description : Waste/polluted water discharged from electroplating, blast furnace and coal mining industries contain mainly __________ substances. (A) Radioactive (B) Organic (C) Inorganic (D) None of these
Last Answer : (C) Inorganic
Description : Limestone addition in the blast furnace is done to flux __________ present in the raw materials. (A) SiO2 (B) Al2O3 (C) MnO2 (D) P
Last Answer : Limestone addition in the blast furnace is done to flux __________ present in the raw materials. (A) SiO2 (B) Al2O3 (C) MnO2 (D) P
Description : The approximate height of a blast furnace having a useful volume of 2000 m3is about __________ metres (A) 25 (B) 35 (C) 55 (D) 75
Last Answer : (C) 55
Description : During the extraction of iron in the blast furnace ,
Last Answer : During the extraction of iron in the blast furnace , A. Coke acts as reducing agent in the lower ... and Coke acts as reducing agent in the upper zone
Description : In the metallurgy of iron, when limestone is added to the blast furnace,the calcium ions end up in
Last Answer : In the metallurgy of iron, when limestone is added to the blast furnace,the calcium ions end up ... B. Gangue C. Metallic calcium D. Calcium Carbonate
Description : Near the top of the blast furnace, iron oxides are reduced to …… by carbon monoxide .
Last Answer : Near the top of the blast furnace, iron oxides are reduced to …… by carbon monoxide . A. C B. CO C. `CO_(2)` D. `CaCO_(3)`
Description : The main reactions occuring in blast furnace during extraction of iron from haematite ore…..
Last Answer : The main reactions occuring in blast furnace during extraction of iron from haematite ore .. A. `Fe_(2)O_ ... 3Cto2Fe+3CO` D. `CaO+SiO_(2)toCaSiO_(2)`
Description : The flux used in the extraction of iron from Haematite in te blast furnace is `"["EAM(ENG)2014"]"`
Last Answer : The flux used in the extraction of iron from Haematite in te blast furnace is `"["EAM(ENG)2014"]"` A. Lime stone B. Silica C. Coke D. CO
Description : The iron formed in blast furnace is calle d
Last Answer : The iron formed in blast furnace is calle d A. Pig iron B. Wrought iron C. Steel D. Cast iron
Description : The slag formed in the blast furnace during the extraction of iron from haematite is
Last Answer : The slag formed in the blast furnace during the extraction of iron from haematite is A. `Ca_(3)(PO_(4))_(2)` ... (3)` C. `FeSiO_(3)` D. `MnSiO_(3)`
Description : A mixture of haematite, coke and limestone on heating in blast furnace gives molten iron metal. This is known as
Last Answer : A mixture of haematite, coke and limestone on heating in blast furnace gives molten iron metal. ... Smelting B. Calcination C. Roasting D. Liquition