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

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
by

1 Answer

Answer :

(C) 1000°C
by

Related questions

Pressure & temperature maintained in catalytic cracking is about (A) 2 atm & 500°C (B) 10 atm & 500°C (C) 30 atm & 200°C (D) 50 atm & 750°C

Description : Pressure & temperature maintained in catalytic cracking is about (A) 2 atm & 500°C (B) 10 atm & 500°C (C) 30 atm & 200°C (D) 50 atm & 750°C

Last Answer : (A) 2 atm & 500°C

Calcination of limestone to produce lime is done in a __________ kiln. (A) Tunnel (B) Rotary (C) Vertical shaft (D) Both (B) and (C)

Description : Calcination of limestone to produce lime is done in a __________ kiln. (A) Tunnel (B) Rotary (C) Vertical shaft (D) Both (B) and (C)

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

Calcination of limestone is not done in a __________ kiln for producing lime. (A) Vertical shaft (B) Rotary (C) Fluidised bed (D) Fixed bed

Description : Calcination of limestone is not done in a __________ kiln for producing lime. (A) Vertical shaft (B) Rotary (C) Fluidised bed (D) Fixed bed

Last Answer : (D) Fixed bed

Reducing atmosphere is maintained in a (A) Calcination kiln (B) Blast furnace (C) Soaking pit (D) L.D. converter

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

Dust collection efficiency of electrostatic precipitator can be as high as 99.9%. Maximum temperature and pressure of dust laden gas that can be cleaned in an electrostatic precipitator is respectively. (A) 200°C and 5 atm (B) 1000°C and 10 atm (C) 500°C and 50 atm (D) 1000°C and 500 atm

Description : Dust collection efficiency of electrostatic precipitator can be as high as 99.9%. Maximum temperature and pressure of dust laden gas that can be cleaned in an electrostatic precipitator is respectively. (A) 200°C and 5 atm (B) 1000°C and 10 atm (C) 500°C and 50 atm (D) 1000°C and 500 atm

Last Answer : (B) 1000°C and 10 atm

Vinyl chloride (CH2 = CH.Cl) is produced by the thermal pyrolysis of ethylene dichloride at a pressure & temperature of (A) 4 kgf/cm2 & 500°C (B) 10 kgf/cm2 & 1000°C (C) 40 kg/cm2 & 200°C (D) 100 kgf/cm2 & 500°C

Description : Vinyl chloride (CH2 = CH.Cl) is produced by the thermal pyrolysis of ethylene dichloride at a pressure & temperature of (A) 4 kgf/cm2 & 500°C (B) 10 kgf/cm2 & 1000°C (C) 40 kg/cm2 & 200°C (D) 100 kgf/cm2 & 500°C

Last Answer : (A) 4 kgf/cm2 & 500°C

Ethylene oxide is produced by oxidation of ethylene in presence of AgOcatalyst at(A) 1 atm & 100°C(B) 5 atm & 275°C(C) 100 atm & 500°C(D) 50 atm & 1000°C

Description : Ethylene oxide is produced by oxidation of ethylene in presence of AgOcatalyst at (A) 1 atm & 100°C (B) 5 atm & 275°C (C) 100 atm & 500°C (D) 50 atm & 1000°C

Last Answer : (B) 5 atm & 275°C

To obtain cement dry powder, lime stones and shales or their slurry, is burnt in a rotary kiln at a temperature between (A) 1100° and 1200°C (B) 1200° and 1300°C (C) 1300° and 1400°C (D) 1400° and 1500°C

Description : To obtain cement dry powder, lime stones and shales or their slurry, is burnt in a rotary kiln at a temperature between (A) 1100° and 1200°C (B) 1200° and 1300°C (C) 1300° and 1400°C (D) 1400° and 1500°C

Last Answer : D

Calcination reaction of limestone (CaCO3 → CaO + CO2 ) goes to completion in the rotary kiln, because (A) CaO is not dissociated (B) CO2 escapes continuously (C) Of high calcination temperature (D) CaO is more stable than CaCO3

Description : Calcination reaction of limestone (CaCO3 → CaO + CO2 ) goes to completion in the rotary kiln, because (A) CaO is not dissociated (B) CO2 escapes continuously (C) Of high calcination temperature (D) CaO is more stable than CaCO3

Last Answer : (B) CO2 escapes continuously

The radiation heat flux from a heating element at a temperature of 800°C, in a furnace maintained at 300°C is 8 kW/m2 . The flux, when the element temperature is increased to 1000°C for the same furnace temperature is (A) 11.2 kW/m2(B) 12.0 kW/m2(C) 14.6 kW/m2(D) 16.5 kW/m

Description : The radiation heat flux from a heating element at a temperature of 800°C, in a furnace maintained at 300°C is 8 kW/m2 . The flux, when the element temperature is increased to 1000°C for the same furnace temperature is (A) 11.2 kW/m2 (B) 12.0 kW/m2 (C) 14.6 kW/m2 (D) 16.5 kW/m

Last Answer : (D) 16.5 kW/m2

Thermal efficiency of a limestone calcination rotary kiln may be around __________ percent. (A) 20 (B) 40 (C) 65 (D) 80

Description : Thermal efficiency of a limestone calcination rotary kiln may be around __________ percent. (A) 20 (B) 40 (C) 65 (D) 80

Last Answer : (B) 40

Which of the following is not a directly fired furnace? (A) By-product coke oven (B) Calcination kiln (C) Sintering furnace (D) Open hearth furnace

Description : Which of the following is not a directly fired furnace? (A) By-product coke oven (B) Calcination kiln (C) Sintering furnace (D) Open hearth furnace

Last Answer : (A) By-product coke oven

Forced recirculation of furnace gases is practised (A) To increase heat transfer by convection (B) To ensure uniform temperature (C) In furnaces, operating below 750°C (D) All (A), (B) and (C)

Description : Forced recirculation of furnace gases is practised (A) To increase heat transfer by convection (B) To ensure uniform temperature (C) In furnaces, operating below 750°C (D) All (A), (B) and (C)

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

Rotary kilns are used in the (A) Calcination of limestone & dolomite (B) Cement manufacture (C) Both (A) and (B) (D) Neither (A) nor (B)

Description : Rotary kilns are used in the (A) Calcination of limestone & dolomite (B) Cement manufacture (C) Both (A) and (B) (D) Neither (A) nor (B)

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

Large tonnage of refractory bricks are dried in a (A) Shaft furnace (B) Rotary hearth furnace (C) Tunnel kiln (D) Muffle furnace

Description : Large tonnage of refractory bricks are dried in a (A) Shaft furnace (B) Rotary hearth furnace (C) Tunnel kiln (D) Muffle furnace

Last Answer : (C) Tunnel kiln

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

Description : 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

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

Description : 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

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

In the manufacture of cement, the dry of wet mixtue of calcareous and argillaceous materials is burnt in a (a) A Rotary kiln (b) A Grinder (c) Country kiln (d) All the above

Description : In the manufacture of cement, the dry of wet mixtue of calcareous and argillaceous materials is burnt in a (a) A Rotary kiln (b) A Grinder (c) Country kiln (d) All the above

Last Answer : (a) A Rotary kiln

The ultrapure metal is obtained by - (1) Calcination (2) Sublimation (3) zone refining (4) None of these

Description : The ultrapure metal is obtained by - (1) Calcination (2) Sublimation (3) zone refining (4) None of these

Last Answer : (3) zone refining Explanation: The principal stages in the production of ultrapure metals are the preparation of pure chemical compounds, the reduction of the compounds to the elementary state and further purification.

Temperature maintained in the emulsion polymerisation reactor for PVC manufacture is about __________ ° C. (A) -20 (B) 50 (C) 250 (D) 500

Description : Temperature maintained in the emulsion polymerisation reactor for PVC manufacture is about __________ ° C. (A) -20 (B) 50 (C) 250 (D) 500

Last Answer : (B) 50

How do you control red spot in kiln burning zone?

Description : How do you control red spot in kiln burning zone?

Last Answer : Feel Free to Answer

The temperature of oxyacetylene flame is around – (1) 2800°C (2) 3200°C (3) 4000°C (4) 1500°C

Description : The temperature of oxyacetylene flame is around – (1) 2800°C (2) 3200°C (3) 4000°C (4) 1500°C

Last Answer : (2) 3200°C Explanation: Flames are formed when a fuel gas, like acetylene, reacts with a support has such as oxygen. This reaction creates a lot of heat and light, which we see as a flame. ... flame temperature to allow localized melting of the work piece material (e.g. steel) in a room environment.

The temperature at which this compound is formed is in the range? a) 350-550°C b) 550-800°C c) 800-1050°C d) 1050-1500°C

Description : The temperature at which this compound is formed is in the range? a) 350-550°C b) 550-800°C c) 800-1050°C d) 1050-1500°C

Last Answer : b) 550-800°C

The temperature of oxy-acetylene flame is around (1) 2800°C (2) 3200°C (3) 4000°C (4) 1500°C

Description : The temperature of oxy-acetylene flame is around (1) 2800°C (2) 3200°C (3) 4000°C (4) 1500°C

Last Answer : 3200°C

Pick out the wrong statement. (A) Alkylation produces a larger iso-paraffin (having higher octane number) from the reaction of an olefin with smaller iso-paraffin (B) Catalytic alkylation processes use HF, AlCl3 & H2SO4 as Catalysts (C) All the alkylation processes use very high temperature (> 1000°C) (D) Gasoline having an octane number of 90 can be produced by alkylation process

Description : Pick out the wrong statement. (A) Alkylation produces a larger iso-paraffin (having higher octane number) from the reaction of an olefin with smaller iso-paraffin (B) Catalytic alkylation processes use HF ... (> 1000°C) (D) Gasoline having an octane number of 90 can be produced by alkylation process

Last Answer : (C) All the alkylation processes use very high temperature (> 1000°C)

Three solid objects of the same material and of equal mass-a sphere, a cylinder (length = diameter) and a cube are at 500°C initially. These are dropped in a quenching bath containing a large volume of cooling oil each attaining the bath temperature eventually. The time required for 90% change in temperature is the smallest for (A) Cube (B) Cylinder (C) Sphere (D) Equal for all the three

Description : Three solid objects of the same material and of equal mass-a sphere, a cylinder (length = diameter) and a cube are at 500°C initially. These are dropped in a quenching bath containing a large volume of cooling oil ... (A) Cube (B) Cylinder (C) Sphere (D) Equal for all the three

Last Answer : (A) Cube

With increase in the time of carbonisation at a particular temperature(say 1000°C), the __________ percentage in coke oven gas increases. (A) Hydrogen (B) Methane (C) Unsaturated hydrocarbons (D) All (A), (B) and (C)

Description : With increase in the time of carbonisation at a particular temperature(say 1000°C), the __________ percentage in coke oven gas increases. (A) Hydrogen (B) Methane (C) Unsaturated hydrocarbons (D) All (A), (B) and (C)

Last Answer : (A) Hydrogen

Temperature and pressure in ammonia converter is (A) 200 atm, 1000°C (B) 450 atm, 200°C (C) 450 atm, 550°C (D) 450 atm, 1000°C

Description : Temperature and pressure in ammonia converter is (A) 200 atm, 1000°C (B) 450 atm, 200°C (C) 450 atm, 550°C (D) 450 atm, 1000°C

Last Answer : (C) 450 atm, 550°C

A solid metallic block weighing 5 kg has an initial temperature of 500°C. 40 kg of water initially at 25°C is contained in a perfectly insulated tank. The metallic block is brought into contact with water. Both of them come to equilibrium. Specific heat of block material is 0.4 kJ.kg-1. K-1. Ignoring the effect of expansion and contraction and also the heat capacity to tank, the total entropy change in kJ.kg-1, K-1is (A) -1.87 (B) 0 (C) 1.26 (D) 3.91

Description : A solid metallic block weighing 5 kg has an initial temperature of 500°C. 40 kg of water initially at 25°C is contained in a perfectly insulated tank. The metallic block is brought into contact with water. Both of them come to equilibrium. ... .kg-1, K-1is (A) -1.87 (B) 0 (C) 1.26 (D) 3.91

Last Answer : (B) 0

__________ glass is used in the mercury in glass thermometer meant for measuring a temperature of 500°C. (A) Borosilicate (B) High silica (C) Supermax (D) Lead

Description : __________ glass is used in the mercury in glass thermometer meant for measuring a temperature of 500°C. (A) Borosilicate (B) High silica (C) Supermax (D) Lead

Last Answer : (C) Supermax

In diesel engine the fuel injected would burn instantaneously at about compressed air temperature of A. 1000°C B. 250°C C. 450°C D. 2000°C

Description : In diesel engine the fuel injected would burn instantaneously at about compressed air temperature of A. 1000°C B. 250°C C. 450°C D. 2000°C

Last Answer : ANSWER : A

When limestone is subjected to high temperature and pressure known as Metamorphism, it results in the formation of? a. Granite b. Quicklime c. Sandstone d. Marble

Description : When limestone is subjected to high temperature and pressure known as Metamorphism, it results in the formation of? a. Granite b. Quicklime c. Sandstone d. Marble

Last Answer : d. Marble

A concrete structure is set on fire and the temperature raises to 1000°C. The strength of concrete as compared to original strength reduces to (A) 10 % (B) 15 % (C) 20 % (D) 25 %

Description : A concrete structure is set on fire and the temperature raises to 1000°C. The strength of concrete as compared to original strength reduces to (A) 10 % (B) 15 % (C) 20 % (D) 25 %

Last Answer : Answer: Option C

Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter) (A) 0.5 D (B) D (C) 1.5 D (D) 2 D

Description : Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The ... where, D = impeller diameter) (A) 0.5 D (B) D (C) 1.5 D (D) 2 D

Last Answer : (B) D

The following is the operating temperatures of the sodium –sulphur battery. • 400 to 600°C • 1000 to 1500°C • 300 to 350°C • 100 to 200°C

Description : The following is the operating temperatures of the sodium –sulphur battery. • 400 to 600°C • 1000 to 1500°C • 300 to 350°C • 100 to 200°C

Last Answer : • 300 to 350°C

Iron is not used alone as a catalyst in ammonia synthesis, because (A) Its activity declines rapidly, if heated to above 520°C (B) It decomposes ammonia (C) It gets oxidised above 500°C (D) None of these

Description : Iron is not used alone as a catalyst in ammonia synthesis, because (A) Its activity declines rapidly, if heated to above 520°C (B) It decomposes ammonia (C) It gets oxidised above 500°C (D) None of these

Last Answer : (A) Its activity declines rapidly, if heated to above 520°C

Ca(OH)2 is called (A) Quicklime (B) Slaked lime (C) Limestone (D) Gypsum

Description : Ca(OH)2 is called (A) Quicklime (B) Slaked lime (C) Limestone (D) Gypsum

Last Answer : (B) Slaked lime

Fusion of limestone and __________ produces high alumina cement. (A) Sand (B) Bauxite (C) Quicklime (D) Calcite

Description : Fusion of limestone and __________ produces high alumina cement. (A) Sand (B) Bauxite (C) Quicklime (D) Calcite

Last Answer : (B) Bauxite

__________ of quicklime produces slaked lime. (A) Hydration (B) Dehydration (C) Hydrogenation (D) None of these

Description : __________ of quicklime produces slaked lime. (A) Hydration (B) Dehydration (C) Hydrogenation (D) None of these

Last Answer : (A) Hydration

(A) Washing soda (B) Soda ash (C) Slaked lime (D) Quicklime

Description : (A) Washing soda (B) Soda ash (C) Slaked lime (D) Quicklime

Last Answer : (A) Washing soda

The activity of pure hydrogen gas at 1000°C and 5 atm pressure (A) Is always less than 1 (B) Is always greater than 1 (C) Can be 5 (D) Depends on the choice of the standard state

Description : The activity of pure hydrogen gas at 1000°C and 5 atm pressure (A) Is always less than 1 (B) Is always greater than 1 (C) Can be 5 (D) Depends on the choice of the standard state

Last Answer : (D) Depends on the choice of the standard state

The value of y = cp/cv. at < 500°C for air & most common gases can be safely assumed to be (A) 0.8 (B) 1 (C) 1.4 (D) 1.8

Description : The value of y = cp/cv. at < 500°C for air & most common gases can be safely assumed to be (A) 0.8 (B) 1 (C) 1.4 (D) 1.8

Last Answer : Option C

What is quicklime and what are the uses?

Description : What is quicklime and what are the uses?

Last Answer : Quicklime (Calcium Oxide) is an efficient scavenger of moisture in its dehydrated state. It is also cheap, compared to orthe scavengers such as silica gel, drierite, oxazolidines, etc. It is commonly found in water sensitive paint formulations (such as polyurethanes and polyureas).

Fusion zone in the electric furnace used for reduction of phosphate rock to elemental phosphorous is maintained at __________ °C. (A) 250-300 (B) 500-750 (C) 950-1050 (D) 1400-1450

Description : Fusion zone in the electric furnace used for reduction of phosphate rock to elemental phosphorous is maintained at __________ °C. (A) 250-300 (B) 500-750 (C) 950-1050 (D) 1400-1450

Last Answer : (D) 1400-1450

In case of unsteady fluid flow, conditions & flow pattern change with the passage of time at a position in a flow situation. Which of the following is an example of unsteady flow? (A) Discharge of water by a centrifugal pump being run at a constant rpm (B) Water flow in the suction and discharge pipe of a reciprocating pump (C) Water discharge from a vertical vessel in which constant level is maintained (D) Low velocity flow of a highly viscous liquid through a hydraulically smooth pipe

Description : In case of unsteady fluid flow, conditions & flow pattern change with the passage of time at a position in a flow situation. Which of the following is an example of unsteady flow? (A) ... level is maintained (D) Low velocity flow of a highly viscous liquid through a hydraulically smooth pipe

Last Answer : (B) Water flow in the suction and discharge pipe of a reciprocating pump

Quicklime is an alkaline powder obtained by strongly heating which other material?

Description : Quicklime is an alkaline powder obtained by strongly heating which other material?

Last Answer : Chalk

Hardening is a process of heating a metal to a) 400°C b) 500°C c) 600°C d) 700°C

Description : Hardening is a process of heating a metal to a) 400°C b) 500°C c) 600°C d) 700°C

Last Answer : c) 600°C

Anthracene undergoes oxidation with O2/V2O5 at 500°C to give (a) Benzoic acid (b) Anthraquinone (c) Phthalic acid (d) Benzophenone

Description : Anthracene undergoes oxidation with O2/V2O5 at 500°C to give (a) Benzoic acid (b) Anthraquinone (c) Phthalic acid (d) Benzophenone

Last Answer : Anthraquinone

The product obtained on mixing calcium oxide with water is called (A) Quicklime (B) Slaked lime (C) Milk of lime (D) None of these

Description : The product obtained on mixing calcium oxide with water is called (A) Quicklime (B) Slaked lime (C) Milk of lime (D) None of these

Last Answer : (B) Slaked lime

A student took solid quicklime in a china dish and added a small amount of water in it. State the type of sound produced in the reaction. Mention the type of reaction?

Description : A student took solid quicklime in a china dish and added a small amount of water in it. State the type of sound produced in the reaction. Mention the type of reaction?

Last Answer : Answer. The hissing sound is produced as it is an exothermic reaction. Combination reaction.