Anthracite can be used for (A) Recarbonising steel (B) Making carbon electrodes(C) Blending with highly coking coal to check its swelling which helps insaving coke even walls from damage and to produce high strength coke(D) All (A), (B) and (C)

Anthracite can be used for
(A) Recarbonising steel
(B) Making carbon electrodes
(C) Blending with highly coking coal to check its swelling which helps in
saving coke even walls from damage and to produce high strength coke
(D) All (A), (B) and (C)
by

1 Answer

Answer :

(D) All (A), (B) and (C)
by

Related questions

Prime coking coal is always blended with medium or non- coking coal before carbonisation (A) To check against its excessive swelling during heating, which may exert high pressure and damage coke oven walls (B) Because, it alone produces unreactive coke (C) Both (A) and (B) (D) Neither (A) nor (B)

Description : Prime coking coal is always blended with medium or non- coking coal before carbonisation (A) To check against its excessive swelling during heating, which may exert high pressure and damage coke oven walls (B) Because, it alone produces unreactive coke (C) Both (A) and (B) (D) Neither (A) nor (B)

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

Fussain (A) Is friable, charcoal like substance(B) Has highest fixed carbon and lowest volatile matter content of all the four banded components of coal (C) Is non-coking, but when blended with highly coking coal, controls its swelling and produces high strength coke on carbonisation (D) All (A), (B) and (C)

Description : Fussain (A) Is friable, charcoal like substance (B) Has highest fixed carbon and lowest volatile matter content of all the four banded components of coal (C) Is non-coking, but when blended with highly coking ... its swelling and produces high strength coke on carbonisation (D) All (A), (B) and (C)

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

High rate of heating of coke ovens (A) May damage its walls due to abrupt excessive swelling of coal (B) Produces larger size coke (C) Increases the time of carbonisation (D) None of these

Description : High rate of heating of coke ovens (A) May damage its walls due to abrupt excessive swelling of coal (B) Produces larger size coke (C) Increases the time of carbonisation (D) None of these

Last Answer : (A) May damage its walls due to abrupt excessive swelling of coal

Pick out the wrong statement. (A) Indian coals on an average contain 25-30% ash as against 10-12% ash in imported coking coal (B) Ammonia is recovered in the form of ammonium sulphate in direct process of by-product recovery (C) A high swelling index number of coking coal indicates poor caking properties of coal (D) Wash oil is used for scrubbing Benzol from coke oven gas

Description : Pick out the wrong statement. (A) Indian coals on an average contain 25-30% ash as against 10-12% ash in imported coking coal (B) Ammonia is recovered in the form of ammonium sulphate in direct ... indicates poor caking properties of coal (D) Wash oil is used for scrubbing Benzol from coke oven gas

Last Answer : (C) A high swelling index number of coking coal indicates poor caking properties of coal

Presence of free moisture in coal during its high temperature carbonisation (A) Reduces the coking time (B) Protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot oven walls (C) Increases the loss of fine coal dust from the ovens when charging (D) None of these

Description : Presence of free moisture in coal during its high temperature carbonisation (A) Reduces the coking time (B) Protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot oven walls (C) Increases the loss of fine coal dust from the ovens when charging (D) None of these

Last Answer : (B) Protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot oven walls

. Highly caking coals (A) Produce weak coke (B) Produce strong coke (C) May damage the coke oven walls during carbonisation (D) Both (B) and (C)

Description : . Highly caking coals (A) Produce weak coke (B) Produce strong coke (C) May damage the coke oven walls during carbonisation (D) Both (B) and (C)

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

Fuel consumption in coke making can be reduced by (A) Preheating, blending and de-ashing the coal (B) Stamped charging of coal (C) Dry quenching of coke (D) All (A), (B) and (C)

Description : Fuel consumption in coke making can be reduced by (A) Preheating, blending and de-ashing the coal (B) Stamped charging of coal (C) Dry quenching of coke (D) All (A), (B) and (C)

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

Beehive coke oven (A) Facilitates by-products recovery (B) Takes 2-3 days for coking of coal but requires no external fuel for heating (C) Gives larger yield of coke (around 85%) as compared to by-product ovens (D) Produces coke with very poor strength

Description : Beehive coke oven (A) Facilitates by-products recovery (B) Takes 2-3 days for coking of coal but requires no external fuel for heating (C) Gives larger yield of coke (around 85%) as compared to by-product ovens (D) Produces coke with very poor strength

Last Answer : (B) Takes 2-3 days for coking of coal but requires no external fuel for heating

The difference between total carbon and fixed carbon of coal will be minimum in case of (A) Lignite (B) Bituminous coal (C) Anthracite (D) High temperature coke (V.M < 0.5%)

Description : The difference between total carbon and fixed carbon of coal will be minimum in case of (A) Lignite (B) Bituminous coal (C) Anthracite (D) High temperature coke (V.M < 0.5%)

Last Answer : (D) High temperature coke (V.M < 0.5%)

Anthracite coal (A) Contains more volatile matter than bituminous coal (B) Ignites more easily than bituminous coal (C) Is essentially a coking coal (D) Burns with short, bluish, yellow-tipped flame producing very little smoke

Description : Anthracite coal (A) Contains more volatile matter than bituminous coal (B) Ignites more easily than bituminous coal (C) Is essentially a coking coal (D) Burns with short, bluish, yellow-tipped flame producing very little smoke

Last Answer : (D) Burns with short, bluish, yellow-tipped flame producing very little smoke

Bituminous coal (A) Ignites less easily than anthracite (B) Is generally coking (C) Burns with smoky yellow flame (D) Both (B) and (C)

Description : Bituminous coal (A) Ignites less easily than anthracite (B) Is generally coking (C) Burns with smoky yellow flame (D) Both (B) and (C)

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

Which of the following is unsuitable fuel for producer gas manufacture? (A) Coke (B) Anthracite (C) Coal having low fusion point of its ash (D) Coal having high fusion point of its ash

Description : Which of the following is unsuitable fuel for producer gas manufacture? (A) Coke (B) Anthracite (C) Coal having low fusion point of its ash (D) Coal having high fusion point of its ash

Last Answer : (C) Coal having low fusion point of its ash

Coal tar is used as a (A) Binding material for coal briquettes (B) Fuel in rotary kiln (C) Binder in making carbon electrodes (D) All (A), (B) and (C)

Description : Coal tar is used as a (A) Binding material for coal briquettes (B) Fuel in rotary kiln (C) Binder in making carbon electrodes (D) All (A), (B) and (C)

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

Which of the following fuels is generally not used in thermal power plant boiler firing? (A) Furnace oil, light diesel oil and tar/PCM (B) Pulverised coking coal (C) Coal middling from washeries (D) B.F. gas, coke oven gas and L.D. converter gas

Description : Which of the following fuels is generally not used in thermal power plant boiler firing? (A) Furnace oil, light diesel oil and tar/PCM (B) Pulverised coking coal (C) Coal middling from washeries (D) B.F. gas, coke oven gas and L.D. converter gas

Last Answer : (B) Pulverised coking coal

Pick out the wrong statement. (A) Percentage of ash in coke produced from medium coking coal is more than that in coal (B) The calorific value (kcal/Nm3 ) of coke oven gas reduces on removal of hydrogen from it by cryogenic method (C) Ash is normally removed as 'fly-ash' in Kopper-Totzek process of coal gasification (D) Coal based fertiliser plants in India at Talcher (Orissa) and Ramagundam (A.P) employ Kopper-Totzek process of coal gasification

Description : Pick out the wrong statement. (A) Percentage of ash in coke produced from medium coking coal is more than that in coal (B) The calorific value (kcal/Nm3 ) of coke oven gas reduces on ... plants in India at Talcher (Orissa) and Ramagundam (A.P) employ Kopper-Totzek process of coal gasification

Last Answer : (C) Ash is normally removed as 'fly-ash' in Kopper-Totzek process of coal gasification

Ash content in the coke produced from a coking coal having 20% ash may be around __________ percent. (A) 6 (B) 12 (C) 18 (D) 24

Description : Ash content in the coke produced from a coking coal having 20% ash may be around __________ percent. (A) 6 (B) 12 (C) 18 (D) 24

Last Answer : (D) 24

Preheating of coal charge for the coke ovens reduces the (A) Time of carbonisation (B) Yield of gas and tar(C) Fuel consumption in coking(D) All (A), (B) and (C)

Description : Preheating of coal charge for the coke ovens reduces the (A) Time of carbonisation (B) Yield of gas and tar (C) Fuel consumption in coking (D) All (A), (B) and (C)

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

Which of the following is the most reactive (as regards the formation of CO + H2 from C + H2O)? (A) Blast furnace coke (B) Low temperature coke (C) Anthracite coal (D) Sub-bituminous coa

Description : Which of the following is the most reactive (as regards the formation of CO + H2 from C + H2O)? (A) Blast furnace coke (B) Low temperature coke (C) Anthracite coal (D) Sub-bituminous coa

Last Answer : (B) Low temperature coke

Hard coke is manufactured from (A) Lignite (B) Bituminous coal (C) Semi-anthracite (D) Anthracite

Description : Hard coke is manufactured from (A) Lignite (B) Bituminous coal (C) Semi-anthracite (D) Anthracite

Last Answer : (B) Bituminous coal

Which will have the least volatile matter and hence will be the most difficult to ignite? (A) Bituminous coal (B) Coke (C) Semi-bituminous coal (D) Anthracite

Description : Which will have the least volatile matter and hence will be the most difficult to ignite? (A) Bituminous coal (B) Coke (C) Semi-bituminous coal (D) Anthracite

Last Answer : (B) Coke

Which of the following would require least amount of secondary air for combustion? (A) Coke breeze containing 25% ash and 2% volatile matter (B) Anthracite containing 10% volatile matter and 8% ash(C) Bituminous coal containing 20% ash and 25% volatile matter(D) Semi-bituminous coal containing 25% ash and 20% volatile matter

Description : Which of the following would require least amount of secondary air for combustion? (A) Coke breeze containing 25% ash and 2% volatile matter (B) Anthracite containing 10% volatile matter and 8% ash ... ash and 25% volatile matter (D) Semi-bituminous coal containing 25% ash and 20% volatile matter

Last Answer : (A) Coke breeze containing 25% ash and 2% volatile matter

Which one of the following is known as the 'brown coal'? (1) Anthracite (2) Bituminous (3) Coke (4) Lignite

Description : Which one of the following is known as the 'brown coal'? (1) Anthracite (2) Bituminous (3) Coke (4) Lignite

Last Answer : (4) Lignite Explanation: Lignite, often referred to as brown coal, is a soft brown fuel with characteristics that put it somewhere between coal and peat. It is considered the lowest rank of coal. It has ... 66%, and an ash content ranging from 6% to 19% compared with 6% to 12% for bituminous coal.

Which one of the following is known as the ‘brown coal’? (1) Anthracite (2) Bituminous (3) Coke (4) Lignite

Description : Which one of the following is known as the ‘brown coal’? (1) Anthracite (2) Bituminous (3) Coke (4) Lignite

Last Answer : (4) Lignite Explanation: Lignite, often referred to as brown coal, is a soft brown fuel with characteristics that put it somewhere between coal and peat. It is considered the lowest rank of coal. It has a carbon content of around 2530%.

Producer gas is obtained by  A. partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast  B. carbonisation of bituminous coal  C. passing steam over incandescent coke  D. passing air and a large amount of steam over waste coal at about 650°C

Description : Producer gas is obtained by  A. partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast  B. carbonisation of bituminous coal  C. passing steam over incandescent coke  D. passing air and a large amount of steam over waste coal at about 650°C

Last Answer : Answer: A

Producer gas is obtained by  A. partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast  B. carbonisation of bituminous coal  C. passing steam over incandescent coke  D. passing air and a large amount of steam over waste coal at about 650°C

Description : Producer gas is obtained by  A. partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast  B. carbonisation of bituminous coal  C. passing steam over incandescent coke  D. passing air and a large amount of steam over waste coal at about 650°C

Last Answer : Answer: A

Which one of the following is known as the ‘brown coal’ ? (1) Anthracite (2) Bituminous (3) Coke (4) Lignite

Description : Which one of the following is known as the ‘brown coal’ ? (1) Anthracite (2) Bituminous (3) Coke (4) Lignite

Last Answer : Lignite

Naphthalene recovered from coke oven gas is used (A) As moisture proof coating on fibres(B) As moth balls (insecticides)(C) As a fuel in furnaces(D) For making electrodes

Description : Naphthalene recovered from coke oven gas is used (A) As moisture proof coating on fibres (B) As moth balls (insecticides) (C) As a fuel in furnaces (D) For making electrodes

Last Answer : (C) As a fuel in furnaces

Helical screw agitator is used for (A) Mixing highly viscous pastes (B) Blending immiscible liquids (C) Mixing liquids at very high temperature (> 250 °C) (D) None of these

Description : Helical screw agitator is used for (A) Mixing highly viscous pastes (B) Blending immiscible liquids (C) Mixing liquids at very high temperature (> 250 °C) (D) None of these

Last Answer : (A) Mixing highly viscous pastes

Mild steel is (A) A low carbon steel (0.05 to 0.3% carbon) (B) Highly resistant to corrosion (as much as stainless steel) (C) A high carbon steel (0.5 to 1.5% carbon) (D) Very poor in strength & ductility

Description : Mild steel is (A) A low carbon steel (0.05 to 0.3% carbon) (B) Highly resistant to corrosion (as much as stainless steel) (C) A high carbon steel (0.5 to 1.5% carbon) (D) Very poor in strength & ductility

Last Answer : (A) A low carbon steel (0.05 to 0.3% carbon)

Pick out the wrong statement. (A) Cokes of high reactivity are obtained from weakly coking coals (B) Cokes of high reactivity are obtained from strongly coking coals (C) Reactivity of coke is inversely proportional to its absolute density (D) Abrasion index of the coke is a measure of its hardness

Description : Pick out the wrong statement. (A) Cokes of high reactivity are obtained from weakly coking coals (B) Cokes of high reactivity are obtained from strongly coking coals (C) Reactivity of coke is inversely proportional to its absolute density (D) Abrasion index of the coke is a measure of its hardness

Last Answer : (B) Cokes of high reactivity are obtained from strongly coking coals

In Lurgi coal gasifier, (A) Coking coals cannot be used (B) Low carbon conversion efficiency is achieved (C) Entrainment of solids is higher (D) Larger quantity of coal can be processed

Description : In Lurgi coal gasifier, (A) Coking coals cannot be used (B) Low carbon conversion efficiency is achieved (C) Entrainment of solids is higher (D) Larger quantity of coal can be processed

Last Answer : (D) Larger quantity of coal can be processed

In the Lurgi coal gasifier (A) Coking coals cannot be used (B) Low carbon conversion efficiency is achieved (C) Entrainment of solids is higher (D) Large quantity of coal can be processed

Description : In the Lurgi coal gasifier (A) Coking coals cannot be used (B) Low carbon conversion efficiency is achieved (C) Entrainment of solids is higher (D) Large quantity of coal can be processed

Last Answer : (D) Large quantity of coal can be processed

The Rourkela steel plant obtains: 1. hydel power from the Hirakud dam 2. coking coal from Jharia coalfields 3. iron ore from Baba Budan hills (a) I, II and III (b) I and II (c) I and III (d) II and III

Description : The Rourkela steel plant obtains: 1. hydel power from the Hirakud dam 2. coking coal from Jharia coalfields 3. iron ore from Baba Budan hills (a) I, II and III (b) I and II (c) I and III (d) II and III

Last Answer : Ans: (d)

Addition of lead, sulphur and phosphorus to low carbon steel helps in improving its (A) Corrosion resistance (B) Tensile strength (C) Machinability (D) Compressive strength

Description : Addition of lead, sulphur and phosphorus to low carbon steel helps in improving its (A) Corrosion resistance (B) Tensile strength (C) Machinability (D) Compressive strength

Last Answer : (C) Machinability

Which one of the following lists four type of coal, arranged in the increasing order of their carbon content? (a) Peat, Lignite, Bituminous, Anthracite (b) Peat, Bituminous, Lignite, Anthracite (c) Lignite, Peat, Bituminous, Anthracite (d) Peat, Anthracite, Lignite, Bituminous

Description : Which one of the following lists four type of coal, arranged in the increasing order of their carbon content? (a) Peat, Lignite, Bituminous, Anthracite (b) Peat, Bituminous, Lignite, Anthracite (c) Lignite, Peat, Bituminous, Anthracite (d) Peat, Anthracite, Lignite, Bituminous

Last Answer : Ans: (a)

Which among the following coal contains 90 per cent of carbon? (1) Anthracite (2) Bitumen (3) Lignite (4) Peat

Description : Which among the following coal contains 90 per cent of carbon? (1) Anthracite (2) Bitumen (3) Lignite (4) Peat

Last Answer : (1) Anthracite Explanation: Coal is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers or veins called coal beds or coal seams. The harder forms, ... elements, chiefly hydrogen, sulfur, oxygen, and nitrogen. Anthracite contains 90 per cent of carbon.

Highest percentage of carbon is found in which form of coal? (1) Anthracite (2) Bituminous (3) Peat (4) Lignite

Description : Highest percentage of carbon is found in which form of coal? (1) Anthracite (2) Bituminous (3) Peat (4) Lignite

Last Answer : (1) Anthracite Explanation: Anthracite is the highest rank of coal since it has a carbon content of over 87% on a dry ash-free basis. Anthracite coal generally has the highest heating value per ton on a mineral-matter-free basis. It has a bright luster and breaks with a semi-conchoidal. fracture.

Which one of the following types of coal contains a higher percentage of carbon than the rest? (1) Bituminous coal (2) Lignite (3) Peat (4) Anthracite

Description : Which one of the following types of coal contains a higher percentage of carbon than the rest? (1) Bituminous coal (2) Lignite (3) Peat (4) Anthracite

Last Answer : (4) Anthracite Explanation: Anthracite is thecoal that gives the most energy and the least pollution (it produces lots of CO2). It is the ideal fuel for power station.

what is anthracite? A. Carbon B. Hard coal (Answer) C. Ammonia D. None of these

Description : what is anthracite? A. Carbon B. Hard coal (Answer) C. Ammonia D. None of these

Last Answer : B. Hard coal (Answer)

Highest percentage of carbon is found in which form of coal? (1) Anthracite (2) Bituminous (3) Peat (4) Lignite

Description : Highest percentage of carbon is found in which form of coal? (1) Anthracite (2) Bituminous (3) Peat (4) Lignite

Last Answer : Anthracite

Which among the following coal contains 90 per cent of carbon? (1) Anthracite (2) Bitumen (3) Lignite (4) Peat

Description : Which among the following coal contains 90 per cent of carbon? (1) Anthracite (2) Bitumen (3) Lignite (4) Peat

Last Answer : Anthracite

Petroleum coke is commercially produced by the __________ process. (A) Hydrocracking (B) Visbreaking (C) Fluid catalytic cracking (D) Delayed coking

Description : Petroleum coke is commercially produced by the __________ process. (A) Hydrocracking (B) Visbreaking (C) Fluid catalytic cracking (D) Delayed coking

Last Answer : (D) Delayed coking

Choose the correct statement. (A) Coking tendency increases with increasing molecular weight (B) Coking tendency decreases with increasing molecular weight (C) Higher pressure enhances coke formation (D) Coking is an exothermic reaction

Description : Choose the correct statement. (A) Coking tendency increases with increasing molecular weight (B) Coking tendency decreases with increasing molecular weight (C) Higher pressure enhances coke formation (D) Coking is an exothermic reaction

Last Answer : (A) Coking tendency increases with increasing molecular weigh

Which is the most ideal feed stock for 'coking' process used for the manufacture of petroleum coke? (A) Naphtha (B) Vacuum residue (C) Light gas oil (D) Diesel

Description : Which is the most ideal feed stock for 'coking' process used for the manufacture of petroleum coke? (A) Naphtha (B) Vacuum residue (C) Light gas oil (D) Diesel

Last Answer : (B) Vacuum residue

Coking time in narrow by-product coke ovens is around __________ hours. (A) 18 (B) 48 (C) 8 (D) 80

Description : Coking time in narrow by-product coke ovens is around __________ hours. (A) 18 (B) 48 (C) 8 (D) 80

Last Answer : (A) 18

Coking time in beehive coke oven is about (A) 12 hours (B) 2-3 days (C) One week (D) Two weeks

Description : Coking time in beehive coke oven is about (A) 12 hours (B) 2-3 days (C) One week (D) Two weeks

Last Answer : (B) 2-3 days

Sometimes water is sprayed during coal charging in the coke oven, which helps in (A) Prevention of clinker formation in the oven (B) Controlling the dust nuisance while charging the coal (C) Reducing the cracking of hydrocarbons in the gas and increasing the percentage of CO & H2 in the gas (due to the endothermic reaction represented by C + H2O = CO + H2 ) (D) All (A), (B) and (C)

Description : Sometimes water is sprayed during coal charging in the coke oven, which helps in (A) Prevention of clinker formation in the oven (B) Controlling the dust nuisance while charging the coal (C) Reducing the cracking of hydrocarbons in ... represented by C + H2O = CO + H2 ) (D) All (A), (B) and (C)

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

Thermal shield used in high powered nuclear reactor to protect the walls of the reactor from radiation damage is made of (A) Concrete (B) Steel (C) Zircaloy (D) Graphite

Description : Thermal shield used in high powered nuclear reactor to protect the walls of the reactor from radiation damage is made of (A) Concrete (B) Steel (C) Zircaloy (D) Graphite

Last Answer : (B) Steel

Kopper-Totzek coal gasifier (A) Can give ammonia synthesis gas (H2 + N2 ) (B) Is a moving bed reactor (C) Cannot use coking coal (D) Operate at very high pressure

Description : Kopper-Totzek coal gasifier (A) Can give ammonia synthesis gas (H2 + N2 ) (B) Is a moving bed reactor (C) Cannot use coking coal (D) Operate at very high pressure

Last Answer : (A) Can give ammonia synthesis gas (H2 + N2 )

A good coking coal should have high __________ content. (A) Ash (B) Sulphur & phosphorus (C) Moisture (D) None of these

Description : A good coking coal should have high __________ content. (A) Ash (B) Sulphur & phosphorus (C) Moisture (D) None of these

Last Answer : (D) None of these