Description : Slag is a name given for - (1) molten iron (2) molten sand (3) molten alumina (4) molten calcium silicate
Last Answer : (3) molten alumina Explanation: Slag is a partially vitreous byproduct of the process of smelting ore, which separates the desired metal fraction from the unwanted fraction. A good example is steelmaking ... separated from the metal, and assist in the removal of sulfur and phosphorus from the steel.
Description : furnace slag is mainly molten (A) Sand (B) Magnesium silicate (C) Calcium silicate (D) Iron pyrite
Last Answer : Option C
Description : The slag which floats on the surface of the molten iron generally contains (A) Lime (CaO) 45% (B) Silica (SiO2) 35% (C) Alumina (Al2O3) 12% and MgO, CaSO4, KMnO2 and FeO 8% (D) All the above
Last Answer : Answer: Option D
Description : The slag which floats on the surface of the molten iron generally contains (A) Lime (CaO) 45% (B) Silica (SiO2) 35% (C) Alumina (Al2O3) 12% and MgO, CaSO4, KMnO2 and FeO 8% (D) All these
Description : The development of first 28 days strength is on account of the hydration of (a) Tricalcium silicate (b) Dicalcium silicate (c) Tricalcium aluminate (d) Tetra calcium alumina ferrite
Last Answer : (a) Tricalcium silicate
Description : Why is slag collected above molten iron?
Last Answer : Slag is lighter than molten iron and collects above molten iron. Slag prevents oxidations of molten iron back into iron oxide.
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
Last Answer : Option B
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 : 36. Aluminium is extracted from alumina (Al2O3 ) by electrolysis of a molten mixture of : (1) Al2O3 + KF + Na3AlF6 (2) Al2O3 + HF + NaAlF4 (3) Al2O3 + CaF2 + NaAlF4 (4) Al2O3 + Na3AlF6 + CaF2
Last Answer : Al2O3 + Na3AlF6 + CaF2
Description : 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
Last Answer : ANSWER: X -- REMOVES SILICATE WASTE PRODUCTS
Description : A coal with high ash content is undesirable, as (A) It is abrasive to the coal pulveriser (i.e. ball mill) and the combustion chamber (B) The ash in molten condition gets absorbed in the pores of the ... and stick to the boiler tubes thereby reducing the heat transfer (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : During pudding (A) Molten metal is kept clear of the fuel (B) Carbon is converted into carbonic acid gas (C) Silicon forms a slag (D) All the above
Description : Name the material which is separated from molten steel during chemical reaction of A.T welding? (i) Aluminium oxide (slag). * (ii) Ferrous Oxide (iii) Aluminium (iv) Ferrous
Last Answer : (i) Aluminium oxide (slag). *
Description : Which of the following is not used as a surface active agent in a flocculation operation? (A) Sodium silicate (B) Quartz (C) Lime (D) Alumina
Last Answer : (B) Quartz
Description : Asbestos (A) Is a natural fibrous mineral substance (B) Is composed of hydrous silicates of calcium and magnesium (CaSiO3, 3MgSiO3) (C) Contains iron oxide and alumina (D) All the above
Description : (1) Calcium silicate and calcium alurninate Explanation: Portland cement is the most common type of cement in general use around the world because it is a basic ingredient of concrete, mortar, stucco ... limited amount of calcium sulfate (which controls the set time) and up to 5% minor constituents.
Last Answer : Milk is a colloidal system in which: (1) Water is dispersed in fat (2) Fat is dispersed in water (3) Fat and water are dispersed in each other (4) Fat is dissolved
Description : Quartz is made of – (1) Calcium Sulphate (2) Calcium Silicate (3) Sodium Sulphate (4) Sodium Silicate
Last Answer : (4) Sodium Silicate Explanation: Quartz is an abundant mineral in the Earth's continental crust. It is made tip of a continuous framework of SiO4 silicon-oxygen tetrahedra, wit Ii each oxygen being shared between two tetrahedra, giving an overall formula SiO2.
Description : The chemical name or Quartz is – (1) Calcium oxide (2) Calcium phosphate (3) Sodium phosphate (4) Sodium silicate
Last Answer : (4) Sodium silicate Explanation: Quartz is a compound of one part silicon and two parts of oxygen, silicon dioxide, SiO2. Quartz is the most abundant silica mineral. It is used in a ... silicon alloys, etc. The various grades of sodium silicate are characterized by their SiO2:Na2O weight ratio.
Description : Glass is mainly composed of - (1) Sodium silicate (2) Calcium carbonate (3) Calcium hydroxide (4) Sodium bicarbonate
Last Answer : (1) Sodium silicate Explanation: Glass is made from silica (SiO₂) and soda lime, which react to form sodium silicate.
Description : Sodium calcium silicate is called _______. (1) Hard glass (2) Borosilicate glass (3) Soft glass (4) Jena glass
Last Answer : (3) Soft glass Explanation: Ordinary glass which is also known as soda glass or soft glass is a mixture of sodium silicate, Calcium silicate, and Silica.
Description : The chemical name of quartz is (1) Calcium oxide (2) Calcium phosphate (3) Sodium phosphate (4) Sodium silicate
Last Answer : Sodium silicate
Description : Cement is usually a mixture of : (1) Calcium silicate and calcium aluminate (2) Calcium silicate and calcium ferrate (3) Calcium aluminate and calcium ferrate (4) Lime stone and silicon dioxide
Last Answer : Calcium silicate and calcium aluminate
Description : Quartz is made of (1) Calcium Sulphate (2) Calcium Silicate (3) Sodium Sulphate (4) Sodium Silicate
Last Answer : Sodium Silicate
Description : Sand and __________ is fused at 1300°C, to produce sodium silicate. (A) Limestone (B) Soda ash (C) Coke (D) Sodium sulphate
Last Answer : (B) Soda ash
Description : The constituent of cement which act as Binders are a) Sand and silica b) Silica and carbon c) tricalcium silicate dicalcium silicate and carbon d) tricalcium aluminate,dicalcium silicate and tricalcium silicate *
Last Answer : d) tricalcium aluminate,dicalcium silicate and tricalcium silicate *
Description : (a) State and explain Kohlrausch law. (b) How much electricity in terms of Faradays is required to produce 20 g of calcium from molten CaCl2? -Chemistry
Last Answer : a) Corrosion is an electrochemical phenomenon. At a particular spot of iron j oxidation it takes place and the spot behaves j as anode and the reaction will be: i At anode : 2Fe(s) → 2Fe2+ + 4e- Electrons ... Ca i.e. 40 g of Ca requires electricity = 2F ∴ 20 g of Ca will require electricity = 1F
Description : The major constituents of glass are (A) Lime, clay and soda ash (B) Sand, lime and soda ash (C) Silica, alumina and clay (D) Silica, alumina and soda ash
Last Answer : (B) Sand, lime and soda ash
Description : Fusion of limestone and __________ produces high alumina cement. (A) Sand (B) Bauxite (C) Quicklime (D) Calcite
Last Answer : (B) Bauxite
Description : What is the stage of the sand becoming a silicon? a. Liquid b. Gas c. Molten d. Hot
Last Answer : c. Molten
Description : What is the stage of the sand becoming silicon? A. Hot B. Gas C. Liquid D. Molten
Last Answer : D. Molten
Description : Uniform ramming of sand in green sand moulding process leads to (A) Reduced chance of gas porosity (B) Greater dimensional stability of the casting (C) Uniform flow of molten metal into the mould cavity (D) Less sand expansion type of casting defect
Description : What is the stage of the sand becoming a silicon? ∙ a. Liquid ∙ b. Gas ∙ c. Molten ∙ d. Hot
Description : Function of Calcium fluoride/flour spar in portion is? (i) To separate slag* (ii) To separate aluminum (iii) To separate ferrous (iv) No separation
Last Answer : (i) To separate slag*
Description : What is the sign of calcium silicate ?
Last Answer : : The signal of calcium silicate is CaSiO3
Description : The chemical name of quartz is (a) Calcium oxide (b) Calcium phosphate (c) Sodium phosphate (d) Sodium silicate
Last Answer : Ans:(d)
Description : The most common filter aid is (A) Diatomaceous earth (B) Calcium silicate (C) Sodium carbonate (D) Silica gel
Last Answer : (A) Diatomaceous earth
Description : Photographic plates are coated with (A) Silver nitrate (B) Silver halide (C) Calcium silicate (D) Metallic silver
Last Answer : (B) Silver halide
Description : Mixture of sodium silicate and calcium silicate is called
Last Answer : glass.
Description : Heating of __________ to 120°C, produces plaster of paris. (A) Blue vitriol (B) Gypsum (C) Calcium silicate (D) Calcium sulphate
Last Answer : (B) Gypsum
Description : Main constituents of Portland cement are calcium aluminate and (A) Gypsum (B) Silicates (C) Sodium silicate (D) Carbonates
Last Answer : (B) Silicates
Description : __________ is the major constituent of the Portland cement. (A) Calcium carbonate (B) Calcium oxide (C) Tricalcium silicate (D) Calcium sulphate
Last Answer : (C) Tricalcium silicate
Description : Finely ground calcium aluminate & silicate is a/an (A) Cermet (B) Cement (C) Abrasive (D) Explosive
Last Answer : (B) Cement
Description : The most commonly used admixture which prolongs the setting and hardening time is (A) Gypsum (B) Calcium chloride (C) Sodium silicate (D) All of the above
Last Answer : (A) Gypsum
Description : Di-calcium silicate (C2S) (A) Hydrates rapidly (B) Generates less heat of hydration (C) Hardens rapidly (D) Provides less ultimate strength to cement
Last Answer : Answer: Option B
Description : The compound of Portland cement which reacts immediately with water and also sets first is (A) Tri-calcium silicate (B) Di-calcium silicate (C) Tri-calcium aluminate (D) Tetra calcium alumino ferrite
Last Answer : Answer: Option C
Description : Initial setting of cement is caused due to (A) Tri-calcium silicate (B) Di-calcium silicate (C) Tri-calcium aluminate (D) Tetra calcium alumino ferrite
Description : The compound of Portland cement which contributes to the strength after two to three years is (A) Tri-calcium silicate (B) Di-calcium silicate (C) Tri-calcium aluminate (D) Tetra-calcium alumino ferrite
Description : Pick up the compound responsible for early strength of cement from the following: (A) Tetra-calcium alumino-ferrite (B) Tri-calcium silicate (C) Tri-calcium aluminate (D) Di-calcium silicate
Description : Good quality cement contains higher percentage of (A) Tri-calcium silicate (B) Di-calcium silicate (C) Tri-calcium aluminate (D) Tetra calcium alumino ferrite
Last Answer : Answer: Option A