During manufacture of glass,

During manufacture of glass,
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1 Answer

Answer :

cullets are used to increase the fusibility.
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Related questions

During manufacture of glass, molten glass is cooled slowly to make it

Description : During manufacture of glass, molten glass is cooled slowly to make it

Last Answer : lose brittleness.

The substance added to decolourise the glass articles during manufacture of glass is

Description : The substance added to decolourise the glass articles during manufacture of glass is

Last Answer : Manganese dioxide.

The gaseous product released during the manufacture of soda glass is

Description : The gaseous product released during the manufacture of soda glass is

Last Answer : carbon dioxide.

Why are broken glass pieces or cullets added during the manufacture of glass?

Description : Why are broken glass pieces or cullets added during the manufacture of glass?

Last Answer : Pieces of broken glass are added to increase fusibility and to recycle broken glass pieces.

Which of the following is used for removing air bubbles from glass during its manufacture? (1) Fledspar (2) Arsenic oxide (3) Potassium Carbonate (4) Soda Ash

Description : Which of the following is used for removing air bubbles from glass during its manufacture? (1) Fledspar (2) Arsenic oxide (3) Potassium Carbonate (4) Soda Ash

Last Answer : (2) Arsenic oxide

Addition of stabiliser during PVC manufacture is done to (A) Improve its impact strength (B) Improve its elasticity (C) Reduce the melt viscosity & glass transition temperature (D) Prevent its thermal degradation

Description : Addition of stabiliser during PVC manufacture is done to (A) Improve its impact strength (B) Improve its elasticity (C) Reduce the melt viscosity & glass transition temperature (D) Prevent its thermal degradation

Last Answer : (D) Prevent its thermal degradation

Co-efficient of thermal expansion of glass is decreased by the addition of __________ during its manufacture. (A) CaO (B) MnO2 (C) ZnO (D) FeS

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Last Answer : (C) ZnO

Pick out the wrong statement. (A) Hard glass which is used for making laboratory glass wares is a mixture of sodium borosilicate and aluminium borosilicate (B) Glass is decolorized during its manufacture by adding antimony oxide, manganese dioxide or arsenic oxide (C) Ordinary glass is represented chemically by Na2O . CaO . 6SiO2 (D) Red color is imparted to glass by addition of arsenic oxide

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The raw materials used in glass manufacture are

Description : The raw materials used in glass manufacture are

Last Answer : soda ash, lime stone and sand.

What is the role of feldspar in the manufacture of glass?

Description : What is the role of feldspar in the manufacture of glass?

Last Answer : When feldspar is added, glass will have a smoother glossy finish. It also adds strength to the ceramic articles.

What property of safety glass is made use in manufacture of windshield of automobiles?

Description : What property of safety glass is made use in manufacture of windshield of automobiles?

Last Answer : Safety glass does not form sharp edges when broken. This property is used in manufacture of windshields of automobiles and aeroplanes.

What is the role of borax or aluminium powder in the manufacture of glass?

Description : What is the role of borax or aluminium powder in the manufacture of glass?

Last Answer : The function of borax / aluminium powder is to remove the air bubbles in glass.

What is the role of the following in the manufacture of glass? a) Cullets b) Manganese dioxide

Description : What is the role of the following in the manufacture of glass? a) Cullets b) Manganese dioxide

Last Answer : a) Cullets are added to increase the fusibility. b) Manganese dioxide is added to decolourise & remove ferrous compounds and carbon.

Mention the steps involved in the manufacture of glass.

Description : Mention the steps involved in the manufacture of glass.

Last Answer : a) Melting b) Shaping c) Annealing d) Finishing

Name the raw materials required for the manufacture of glass.

Description : Name the raw materials required for the manufacture of glass.

Last Answer : a) Soda Ash (Na 2 CO 3 ) b) Lime stone (CaCO 3 ) c) Sand (SiO 2 ) d) Broken pieces of glass (Cullets)

Raw materials used for the manufacture of glass are – (1) sand, soda, limestone (2) sand, charcoal, soda (3) limestone, charcoal, sulphur (4) sand, sulphur, soda

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Last Answer : (1) sand, soda, limestone Explanation: Quartz sand (silica) is the main raw material in commercial glass production. While fused quartz (primarily composed of SiO2) is used for some special ... over 1200 degree C (2192 degree F). Normally, other substances are added to simplify processing.

The chlorinator used in the manufacture of DDT is made of(A) Glass(B) Glass lined steel(C) Teflon(D) Bakelite

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Pot furnace which is either regenerative or recuperative, is used in the manufacture of (A) Glass (B) Stainless steel (C) Potteries (D) Refractory bricks

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Last Answer : (A) Glass

Dense soda ash used in the manufacture of glass, is chemically represented by (A) Na2CO3 (B) Na2CO3 .10H2O (C) Na2CO3 .H2O (D) Na2HCO3

Description : Dense soda ash used in the manufacture of glass, is chemically represented by (A) Na2CO3 (B) Na2CO3 .10H2O (C) Na2CO3 .H2O (D) Na2HCO3

Last Answer : (C) Na2CO3 .H2O

Which of the following is not a raw material used for the manufacture of ordinary glass? (A) Iron oxide (B) Soda ash (C) Limestone (D) Silica

Description : Which of the following is not a raw material used for the manufacture of ordinary glass? (A) Iron oxide (B) Soda ash (C) Limestone (D) Silica

Last Answer : (A) Iron oxide

Salt is the basic raw material for the manufacture of (A) Cement (B) Glass (C) Potteries (D) Caustic soda

Description : Salt is the basic raw material for the manufacture of (A) Cement (B) Glass (C) Potteries (D) Caustic soda

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__________ glass is used for the manufacture of optical glass. (A) Pyrex (B) Soda (C) Flint (D) Crooke's

Description : __________ glass is used for the manufacture of optical glass. (A) Pyrex (B) Soda (C) Flint (D) Crooke's

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Zeolite is used in the (A) Water treatment (B) Glass manufacture (C) Hydrogenation of fatty oil as a catalyst (D) Development of exposed photographic plate

Description : Zeolite is used in the (A) Water treatment (B) Glass manufacture (C) Hydrogenation of fatty oil as a catalyst (D) Development of exposed photographic plate

Last Answer : (A) Water treatment

The ultrapure glass used to manufacture optical fibers is approximately ___pure ∙ a. 99.9 % ∙ b. 99.99 % ∙ c. 99.999 % ∙ d. 99.9999 %

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Last Answer : d. 99.9999 %

Raw materials used for the manufacture of glass are (1) sand, soda, limestone (2) sand, charcoal, soda (3) limestone, charcoal, sulphur (4) sand, sulphur, soda

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Last Answer : sand, soda, limestone

The fermented matter during the manufacture of molasses is called

Description : The fermented matter during the manufacture of molasses is called

Last Answer : wort.

During the manufacture of molasses, it is acidified using

Description : During the manufacture of molasses, it is acidified using

Last Answer : dilute sulphuric acid.

The substance added to lighten the colour of jaggery or sugar during its manufacture is

Description : The substance added to lighten the colour of jaggery or sugar during its manufacture is

Last Answer : hydrosol or sodium bi sulphate.

What is the effect of heating ceramic articles during manufacture?

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Last Answer : On heating ceramic materials to about 1073K to 1273K, they melt into a glass like liquid, which fills the pores between individual clay particles and strengthens their contact points. On cooling, the material becomes glossy and has shining & smooth finish.

Scouring is a finishing operation during the manufacture of fibre, which aims at __________ of fibres. (A) Improving the stretchability (B) Dyeing/colouring (C) Detergent solution washing (D) Glycol soaking

Description : Scouring is a finishing operation during the manufacture of fibre, which aims at __________ of fibres. (A) Improving the stretchability (B) Dyeing/colouring (C) Detergent solution washing (D) Glycol soaking

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Temperature and gage pressure maintained during the manufacture of cold SBR (styrene butadiene rubber) are (A) 5°C and 1 kgf/cm2 (B) - 20°C and 1 kgf/cm2 (C) 0°C and 1 kgf/cm2 (D) 0°C and 3 kgf/cm

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Last Answer : (A) 5°C and 1 kgf/cm

Temperature and gage pressure maintained during the manufacture of hot SBR (styrene butadiene rubber) are (A) 50°C and 3 - 4 kg/cm2 (B) 50°C and 1 kgf/cm2 (C) 250°C and 10 kgf/cm2 (D) 250°C and 1 kgf/cm

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Last Answer : (A) 50°C and 3 - 4 kg/cm

Sodium bicarbonate is produced during soda ash manufacture using a __________ tower. (A) Plate (B) Baffle (C) Packed (D) None of these

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Last Answer : (B) Baffle

Black liquor generated during paper manufacture is concentrated in a (A) Single effect evaporator (B) Single effect evaporator followed by a crystalliser (C) Multiple effect evaporator (D) Multiple effect evaporators followed by a crystalliser

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The shift conversion reaction taking place during water gas manufacture is given by (A) C + H2O ↔ CO + H2 (B) C + 2H2O ↔ CO2 + 2H2 (C) CO + H2O ↔ CO2 + H2 (D) None of these

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Last Answer : (C) CO + H2O ↔ CO2 + H2

Pick out the correct statement. (A) Reaction of NH3 with HNO3 to produce (NH4 )2NO3 is endothermic (B) With increase in NH3 /CO2 ratio, urea yield decreases for a given temperature, pressure and total feed rate (C) Biuret (an intermediate during urea manufacture) is toxic to seeds and animals (D) Both (B) and (C)

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Which of the following solvents is used for the extraction of H3PO4 from CaCl2 solution during manufacture of ortho-phosphoric acid by wet process employing hydrochloric acid leaching? (A) Isopropyl alcohol (B) Butyl alcohol (C) Toluene (D) Hexane

Description : Which of the following solvents is used for the extraction of H3PO4 from CaCl2 solution during manufacture of ortho-phosphoric acid by wet process employing hydrochloric acid leaching? (A) Isopropyl alcohol (B) Butyl alcohol (C) Toluene (D) Hexane

Last Answer : (B) Butyl alcohol

Fertiliser produced during soda ash manufacture by dual process is ammonium (A) Chloride (B) Sulphate (C) Nitrate (D) None of these

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During nitric acid manufacture, catalytic oxidation of ammonia at 800°C in presence of platinum catalyst produces nitrogen oxide. Conversion of NH3 to NO is about __________ percent. (A) 38 (B) 68 (C) 82 (D) 98

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Last Answer : (D) 98

Inhalation of silica dust by human being during hand drilling in mica mining, lead & zinc mining, silica refractory manufacture and in foundries causes (A) Asphyxiation (suffocation) (B) Shortness of breath (C) Tuberculosis (D) All (A), (B) and (C)

Description : Inhalation of silica dust by human being during hand drilling in mica mining, lead & zinc mining, silica refractory manufacture and in foundries causes (A) Asphyxiation (suffocation) (B) Shortness of breath (C) Tuberculosis (D) All (A), (B) and (C)

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

During manufacture of H2SO4 , the oxidation of SO2 to SO3 by oxygen is an endothermic reaction. The yield of SO3 will be maximised, if the (A) Temperature is increased (B) Pressure is reduced (C) Temperature is increased and pressure is reduced (D) Temperature is reduced and pressure is increased

Description : During manufacture of H2SO4 , the oxidation of SO2 to SO3 by oxygen is an endothermic reaction. The yield of SO3 will be maximised, if the (A) Temperature is increased (B) Pressure is reduced (C) Temperature is increased and pressure is reduced (D) Temperature is reduced and pressure is increased

Last Answer : (D) Temperature is reduced and pressure is increased

A catalyst inhibitor (A) Lessens its selectivity (B) May be useful for suppressing undesirable side reactions (C) Is added in small quantity during the catalyst manufacture itself (D) All (A), (B) and (C

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Hollander beater used during paper pulp manufacture does not facilitate the __________ of fibre. (A) Cutting (B) Fibrillation (C) Hydration (D) Strengthening

Description : Hollander beater used during paper pulp manufacture does not facilitate the __________ of fibre. (A) Cutting (B) Fibrillation (C) Hydration (D) Strengthening

Last Answer : (D) Strengthening

The major constituent of black liquor generated during paper manufacture is sodium (A) Sulphate (B) Carbonate (C) Hydroxide (D) Bi-carbonate

Description : The major constituent of black liquor generated during paper manufacture is sodium (A) Sulphate (B) Carbonate (C) Hydroxide (D) Bi-carbonate

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During the manufacture of sulphuric acid, the temperature of molten sulphur is not increased beyond 160°C, as (A) It is very corrosive at elevated temperature (B) Its viscosity is not reduced on further heating (hence pressure drop on pumping it, cannot be further reduced) (C) It decomposes on further increasing the temperature (D) None of these

Description : During the manufacture of sulphuric acid, the temperature of molten sulphur is not increased beyond 160°C, as (A) It is very corrosive at elevated temperature (B) Its viscosity is not reduced on ... be further reduced) (C) It decomposes on further increasing the temperature (D) None of these

Last Answer : (B) Its viscosity is not reduced on further heating (hence pressure drop on pumping it, cannot be further reduced)

How much temperature is maintained during quicklime manufacture in the calcination zone of the vertical shaft kiln? (A) 500°C (B) 750°C (C) 1000°C (D) 1500°C

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Viscose rayon (A) Cannot be made from sulphite pulp (B) Utilises H2SO4 , NaOH and CS2 during its manufacture (C) Cannot yield textile grade fibre (D) None of these

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Last Answer : (B) Utilises H2SO4 , NaOH and CS2 during its manufacture

Which of the following is a co-product during the manufacture of caustic soda by electrolysis of brine? (A) Na2CO3 (B) NaHCO3 (C) H2 (D) None of these

Description : Which of the following is a co-product during the manufacture of caustic soda by electrolysis of brine? (A) Na2CO3 (B) NaHCO3 (C) H2 (D) None of these

Last Answer : (C) H2

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Last Answer : (D) Presence of sodium sulphate in pulp makes the pulp bleachability poor

Which of the following processes does not produce Cl2 as a co-product during the manufacture of caustic soda? (A) Diaphragm electrolytic cell process (B) Mercury electrolytic cell process (C) Lime-soda process (D) None of these

Description : Which of the following processes does not produce Cl2 as a co-product during the manufacture of caustic soda? (A) Diaphragm electrolytic cell process (B) Mercury electrolytic cell process (C) Lime-soda process (D) None of these

Last Answer : (C) Lime-soda process