High amount of sulphur and phosphorous in coke causes (A) Decrease in its calorific value (B) Increase in its strength(C) Brittleness of steel made by using it(D) None of these

High amount of sulphur and phosphorous in coke causes
(A) Decrease in its calorific value
(B) Increase in its strength
(C) Brittleness of steel made by using it
(D) None of these
by

1 Answer

Answer :

(C) Brittleness of steel made by using it
by

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A good metallurgical coke should have very low (A) Sulphur & phosphorous content (B) Porosity (C) Fusion point of its ash (D) Hardness & strength

Description : A good metallurgical coke should have very low (A) Sulphur & phosphorous content (B) Porosity (C) Fusion point of its ash (D) Hardness & strength

Last Answer : (A) Sulphur & phosphorous content

Higher percentage of ash in coal meant for the production of metallurgical grade coke (A) Decreases the hardness of coke (B) Decreases the abrasion resistance of coke (C) Causes brittleness in steel (D) None of these

Description : Higher percentage of ash in coal meant for the production of metallurgical grade coke (A) Decreases the hardness of coke (B) Decreases the abrasion resistance of coke (C) Causes brittleness in steel (D) None of these

Last Answer : (D) None of these

Presence of phosphorous in metallurgical coal (A) Is not undesirable (B) Reduces its calorific value (C) Badly affects the quality of steel

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Last Answer : (C) Badly affects the quality of steel

Brittleness induced due to the presence of sulphur in steel can be reduced by adding (A) Manganese (B) Magnesium (C) Vanadium (D) Copper

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Brittleness induced due to the presence of sulphur in steel can be reduced by adding (A) Manganese (B) Magnesium (C) Vanadium (D) Copper

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A liquid/gaseous fuel containing hydrocarbons and high amount of sulphur is burnt with 40% excess air. The flue gas still contains large amount of carbon monoxide. This may be due to the (A) Presence of large quantity of hydrogen in the fuel (B) Low calorific value of the fuel (C) High sulphur content in the fuel (D) Lack of thorough mixing of fuel with air

Description : A liquid/gaseous fuel containing hydrocarbons and high amount of sulphur is burnt with 40% excess air. The flue gas still contains large amount of carbon monoxide. This may be due to the (A) Presence of large ... fuel (C) High sulphur content in the fuel (D) Lack of thorough mixing of fuel with air

Last Answer : (D) Lack of thorough mixing of fuel with air

With increase in the temperature of carbonisation of coal (A) Hydrogen content of coke oven gas increases due to cracking ofhydrocarbons(B) Methane content in the coke oven gas decreases and carbon monoxidecontent increases(C) Calorific value of the coke oven gas decreases due to cracking ofhydrocarbons which is not compensated by increase in CO & H2 content(D) All (A), (B) and (C)

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High carbon content in the steel causes (A) Decrease in tensile strength but increase in ductility (B) Increase in tensile strength but decrease in ductility (C) Decrease in both tensile strength and ductility (D) Increase in both tensile strength and ductility

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A high concentration of PTH in blood causes (A) Increase in plasma calcium and inorganic phosphorous (B) Decrease in plasma calcium and inorganic phosphorous (C) Increase in plasma calcium and decrease in plasma inorganic phosphorous (D) Decrease in plasma calcium and increase in plasma inorganic phosphorous

Description : A high concentration of PTH in blood causes (A) Increase in plasma calcium and inorganic phosphorous (B) Decrease in plasma calcium and inorganic phosphorous (C) Increase in plasma calcium ... in plasma inorganic phosphorous (D) Decrease in plasma calcium and increase in plasma inorganic phosphorous

Last Answer : Answer : C

Between 230 and 370°C, blue brittleness is caused in mild steel because of the (A) Immobility of dislocation (B) Strain-ageing (C) Increase in Young's modulus (D) Strain hardening

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__________ is added in low carbon steel to raise its yield point. (A) Sulphur (B) Phosphorous (C) Silicon (D) Manganese

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Addition of __________ to steel does not help in improving its machinability. (A) Sulphur (B) Silicon (C) Lead (D) Phosphorous

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Addition of __________ to steel does not help in improving its machinability. (A) Sulphur (B) Silicon (C) Lead (D) Phosphorous

Description : Addition of __________ to steel does not help in improving its machinability. (A) Sulphur (B) Silicon (C) Lead (D) Phosphorous

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In high temperature carbonisation (as compared to low temperature carbonisation) of coal (A) Coke oven gas yield is more (B) Tar yield is less but free carbon in tar is more (C) Calorific value of coke oven gas is less (D) All (A), (B) and (C)

Description : In high temperature carbonisation (as compared to low temperature carbonisation) of coal (A) Coke oven gas yield is more (B) Tar yield is less but free carbon in tar is more (C) Calorific value of coke oven gas is less (D) All (A), (B) and (C)

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

Coke oven gas produced by high temperature carbonisation of coal (as compared to that produced by low temperature carbonisation), has (A) Higher calorific value (B) Lower hydrogen content (C) Both (A) and (B) (D) Neither (A) nor (B)

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Last Answer : (D) Neither (A) nor (B)

In low temperature carbonisation of coal as compared to high temperature carbonisation __________ produced is less. (A) Difference in gross & net calorific value of the coke oven gas (B) Free carbon content in tar (C) Yield percentage of coke (D) Yield of ammonia present in coke oven gas

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In high temperature carbonisation of coal compared to low temperature carbonisation (A) Yield of ammonia is less (B) Aromatic content of tar is low (C) H2 content in the coke oven gas is more (D) Calorific value of the coke oven gas is lower

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Low temperature oxidation of stored coal results in the (A) Decrease in its caking power & calorific value (B) Decrease in its carbon & hydrogen content (C) Increase in its oxygen content (D) All (A), (B) and (A)

Description : Low temperature oxidation of stored coal results in the (A) Decrease in its caking power & calorific value (B) Decrease in its carbon & hydrogen content (C) Increase in its oxygen content (D) All (A), (B) and (A)

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Calcitonin causes (A) Calcinuria and phosphaturia (B) Decrease in urinary calcium (C) Decrease in urinary phosphorous (D) Increase in blood calcium level 212 MCQs IN BIOCHEMISTRY

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With increase in calorific value of fuels, their adiabatic flame temperatures (A) Increase (B) Decrease (C) Remain unchanged (D) May increase or decrease; depends on the quantity of products of combustion

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Ratio of primary air to secondary air increases with increase in the rank of coal, because the (A) High rank coals have higher amount of volatile matter (B) Ratio of fixed carbon to volatile matter increases (C) Oxygen content progressively decreases (D) Calorific value of the coal increases

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Cast iron has very high (A) Compressive strength (B) Ductility (C) Shock resistance (D) Resistance to brittleness

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Removal of hydrogen from coke oven gas (A) Increases its calorific value (B) Decreases its calorific value (C) Does not alter its calorific value (D) Is not possible on commercial scale

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Coke oven gas is a better fuel than blast furnace gas, because of its higher (A) Calorific value, cleanliness and relatively low distribution cost (due to its low specific gravity) (B) Adiabatic flame temperature (C) Heat release rate (thus requiring smaller combustion chamber) (D) All (A), (B) and (C)

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

Which of the following has the least calorific value (kcal/Nm3 )? (A) Blast furnace gas (B) Coke oven gas (C) Sewage gas (D) Natural gas

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Last Answer : (A) Blast furnace gas

Gross & net calorific value is the same for (A) Blast furnace gas (B) Coke oven gas (C) L.D. converter gas (D) None of these

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Out of the following fuels, the difference between gross and net calorific value will be minimum in case of (A) Coke oven gas (B) Water gas (C) Natural gas (D) Blast furnace gas

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Which of the following has the highest gross calorific value? (A) Blast furnace gas (B) Coke oven gas (C) Carburetted water gas (D) Oil refinery gas

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Last Answer : (D) Oil refinery gas

Low temperature carbonisation of coal produces (A) Metallurgical coke (B) Soft coke (C) Very low calorific value coke oven gas (D) No by-products

Description : Low temperature carbonisation of coal produces (A) Metallurgical coke (B) Soft coke (C) Very low calorific value coke oven gas (D) No by-products

Last Answer : (B) Soft coke

Calorific value of coke even gas produced by low temperature carbonisation of coal is about __________ Kcal/Nm3 . (A) 4000 (B) 2500 (C) 6500 (D) 10000

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For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm3 ), while the C.V. is same on weight basis (i.e., kcal/kg)? (A) Propane and acetylene (B) Propane and LPG (C) Sewage gas and gobar gas (D) B.F. gas and coke oven gas

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Last Answer : (A) Propane and acetylene

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

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

The calorific value is the highest out of the following for (A) Producer gas (B) Water gas (C) Coke oven gas (D) Blast furnace gas

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Last Answer : (C) Coke oven gas

Blast furnace gas compared to coke oven gas has (A) Lower ignition temperature (B) Narrower limit of inflammability (C) Higher calorific value (D) Lower theoretical flame temperature

Description : Blast furnace gas compared to coke oven gas has (A) Lower ignition temperature (B) Narrower limit of inflammability (C) Higher calorific value (D) Lower theoretical flame temperature

Last Answer : (D) Lower theoretical flame temperature

Pick out the wrong statement: (A) Carburetted water gas is also called blue gas (B) Coals are divided in four species according to their carbon content in Seylor's classification (C) Carbonisation time in a by-product coke oven is about 16 hours (D) Gross and net calorific value of a fuel is the same, if it does not contain hydrogen or hydrocarbons

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For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm3) while the C.V. is same on weight basis (i.e., kcal/kg)? (A) Propane and acetylene (B) Propane and LPG (C) Sewage gas and gobar gas (D) B.F gas and coke oven gas

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Last Answer : D) B.F gas and coke oven gas

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

Brittleness of cold is due to an excess of (A) Sulphur (B) Carbon (C) Phosphorus (D) Silicon

Description : Brittleness of cold is due to an excess of (A) Sulphur (B) Carbon (C) Phosphorus (D) Silicon

Last Answer : Answer: Option C

. In a linear polymer, the monomeric units are linked together to form long straight chains. The cross linked or branched chain polymers compared to linear polymers have higher (A) Densities (B) Melting point (C) Tensile strength (D) Hardness, rigidity & brittleness

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Last Answer : (D) Hardness, rigidity & brittleness

Presence of __________ in a dry gaseous fuel does not contribute to its calorific value. (A) Sulphur (B) Oxygen (C) Hydrogen (D) Carbon

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Last Answer : (B) Oxygen

Washing of coal (A) Reduces its sulphur and ash content (B) Controls its ash fusibility and increases its calorific value(C) Improves its coking properties(D) All (A), (B) and (C)

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

Tar is a better fuel than furnace oil, because of its (A) Higher calorific value (B) Lower sulphur content (C) Higher emissivity (0.8-0.9) resulting in higher radiation heat transfer rate (D) Both (A) and (B)

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

Which of the following constituents of a fuel does not contribute to its calorific value on combustion? (A) Hydrogen (B) Sulphur (C) Carbon (D) None of these

Description : Which of the following constituents of a fuel does not contribute to its calorific value on combustion? (A) Hydrogen (B) Sulphur (C) Carbon (D) None of these

Last Answer : (D) None of these

Coal tar fuels (CTF) as compared to petroleum based fuel oils have higher (A) Calorific value (B) Higher C/H ratio (C) Sulphur content (D) Difference in gross & net calorific value

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Bomb calorimeter can be used to determine the __________ of the coal. (A) Sulphur content (B) Calorific value (C) Both (A) & (B) (D) Neither (A) nor (B)

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

The optimum percentage of excess air for combustion depends upon the__________ of the fuel.(A) Type (solid, liquid or gaseous)(B) Calorific value(C) Sulphur content(D) Ignition temperature

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Sub zero treatment of steel is done to (A) Suppress martensite transformation (B) Enhance its working performance in sub zero atmosphere (C) Reduce the retained austenite in hardened steel (D) Induce temper brittleness after its hardening

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Last Answer : Option C

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Among the fuels given below, the one with highest calorific value is – (1) Coke (2) Coal (3) Wood (4) Natural gas

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